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15,002 | A flare of the H2O maser W51M | Ashimbaeva, Nuriya, Lekht, Evgeny (Moscow State University, Sternberg Astronomical Institute), Tolmachev, Alexandr (Pushchino Radio Astronomy Observatory) | We report a rapid flare of the source of maser radio emission in the H2O line at 22.235 GHz W51M. The source is associated with a young stellar system. Observations were carried out at the 22-meter radio telescope in Pushchino, Russia. The peak flux density of the feature at VLSR = 59.0 km/s was: 2021 September 26 - 6310 Jy; October 19 - 26200 Jy; October 20 - 17250 Jy. This flare was preceded by a significant increase in the flux density at VLSR = 62.4 km/s from 1000 to 6200 Jy. | 2021-10-27 03:39:00 | radio,young stellar object,request for observations | 2021-10-27 | 03:39:00 | 484 | [
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15,003 | Discovery of AT 2021acbn, a Classical Nova in M31 | Agoston Horti-David, Krisztian Sarneczky, Jozsef Vinko (Konkoly), Xiaoran Ma, Xiaofeng Wang (Tsinghua) | We report the discovery of AT 2021acbn (PNV J00431453+4121099), a new classical nova in M31,. on unfiltered CCD frames taken with the 10560x10560 STA 1600LN CCD camera on the 0.6/0.9m Schmidt. telescope at Piszkesteto Station of Konkoly Observatory. The observations started on 2021-10-23.80 UT, and 13 unfiltered frames were collected with exposure time of 60 seconds each. In order to reduce the contamination from the bright background flux of the M31 disk, a reference image taken previously with the same telescope and setup was subtracted from the spatially registered, median-combined CCD frames. The transient was found on the subtracted frame at. R.A. = 00:43:14.53, Dec. = +41:21:09.9 (J2000). No source was detected at this position on the frames taken on 2021-10-18.8 UT and before. Aperture photometry of the transient was tied to r-band AB-magnitudes of local comparison stars taken from the Pan-STARRS (PS1) DR2 data release. We measure the following (unfiltered) magnitudes on the discovery frame and subsequent follow-up frames: | 2021-10-27 17:04:00 | optical,nova,star,transient | 2021-10-27 | 17:04:00 | 1,045 | [
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] | 15,001 |
15,004 | Discovery of a Probable Supernova in SDSS-DR12 J041606.28-054030.3 galaxy | K. Hornoch, H. Kucakova (Astronomical Institute, Ondrejov, Czech Republic) | We report the discovery of a probable supernova in the galaxy SDSS-DR12 J041606.28-054030.3 (Alam, S., et al. 2015) on a series of 130-s R-band CCD images taken between 2021 Oct. 27.309-27.365 UT with the Danish 1.54-m telescope at La Silla. There is no object visible on a deep stack of g'r'i' PanSTARRS1 images (Chambers, K.C., et al. 2016) available via the MAST Portal nor in a deep (SDSS-DR10 image).
The new object designated PSN J04160610-0540324 is located at R.A. = 4h16m06s.10, Decl. = -5o40'32".4 (equinox 2000.0), which is 2.7" west and 2.2" south of the center of the host galaxy (see link to discovery image below which is co-added from seven single 130-s R-band exposures). Using several Landolt standard stars in a photometric conditions we measure R = 20.7 ± 0.1 for the object on the co-added image centered on Oct. 27.333 UT. | 2021-10-27 20:58:00 | optical,star,supernovae,transient | 2021-10-27 | 20:58:00 | 845 | [
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] | 15,002 |
15,005 | Sub-mm non-detection of GRS 1915+105 | A. J. Tetarenko, E. Pattie, T. Maccarone (Texas Tech) | GRS 1915+105 is a famed microquasar known for its spectacular variability patterns and bright relativistic jets (Mirabel and Rodriguez 1994, Belloni et al. 2000). This system spent almost 26 years in a persistently high luminosity state, until 2018 when it began to fade (Negoro et al. 2018, Motta et al. 2019). By 2019, the system had settled into an extended faint X-ray state (Homan et al. 2019), which is now thought to be driven by Compton-thick obscuration, with parallels being drawn to changing look AGN (Miller et al. 2019). The radio jet behaviour in this new fainter state has been shown to switch between low flux and little variability to displaying strong flares (e.g., Motta et al. 2021; ATels: #12773, #12839).
To sample the current jet behaviour in GRS 1915+105, we observed the source with the SCUBA-2 instrument on the James Clerk Maxwell Telescope (JCMT), located on the slopes of Maunakea in Hawaii. Our observations were taken on October 26 between 05:17:58-05:50:43 UTC (MJD=59513.22-59513.24). GRS 1915+105 was not detected at 850μm (350 GHz), with a 3-sigma upper limit of ~14 mJy. Given the recent low fluxes reported from radio monitoring (Motta et al. 2021), our new sub-mm measurement suggests that GRS 1915+105 likely has a flatter jet spectrum (α=0 for Sν ∝ να) in its current state.
We thank the JCMT for rapidly scheduling our observations. | 2021-10-28 00:36:00 | radio,millimeter,sub-millimeter,x-ray,agn,black hole,transient | 2021-10-28 | 00:36:00 | 1,375 | [
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] | 15,003 |
15,006 | NICER observations during the decline of the current giant outburst of EXO 2030+375: Beginning spectral and pulse profile change | P. Thalhammer (Remeis-Observatory & ECAP), R. Ballhausen (UMD & NASA-GSFC/CRESST), K. Pottschmidt (UMBC & NASA-GSFC/CRESST), P. Kretschmar (ESA-ESAC), F. Fuerst (ESA-ESAC), G. K. Jaisawal (DTU Space), P. Pradhan (MIT), C. Malacaria (USRA), J. B. Coley (Howard University & NASA-GSFC/CRESST), M. T. Wolff (NRL), C. Ferrigno (ISDC), C. A. Wilson-Hodge (NASA-MSFC), J. Wilms (Remeis-Observatory & ECAP) | The Be X-ray binary EXO 2030+375 is currently going through the third, type II outbursts (ATel #14809, #14911, #14931) since its discovery in 1985. The current outburst is weaker than the first two, with a peak flux of ~550 mCrab in the Swift/BAT monitor, roughly half of the previous peak fluxes. We report on the recent changes in both the spectrum and the pulse profile of EXO 2030+375 as observed by NICER.
During the rise of the current outburst the ongoing NICER monitoring showed a clear change in the source behavior, i.e., a softening of the spectrum and a flip in the pulse profile with two out of the three major peaks in the profile shrinking while the third became dominant (ATel #14911). The observed changes in the pulse profile mirrored those seen during previous type II outbursts (Parmar, White, and Stella, 1989, ApJ 338, 373; Epili, Naik, Jaisawal, Gupta, 2017, MNRAS, 472, 3455). These changes with increased flux have been interpreted as signs for a reconfiguration in the accretion geometry from a pencil to a fan beam emission pattern.
During the current decline of the outburst similar changes in both pulse profile and spectral shape are starting to be visible. The spectral evolution is marked by a hardening towards lower luminosities. A fit to the spectrum with an absorbed black body and power-law model shows a decreasing photon index from 1.515+/-0.014 during the peak of the outburst on 14 September 2021 to 1.291+/-0.024 during the most recent NICER observations on 25 October 2021. The black body temperature, on the other hand, has remained constant at around 90 eV, while the hydrogen column density varied between (2.9-3.3)e22 cm^-2. The relative strength of the black body component compared to the power law increases with decreasing flux, again mirroring the behavior during the rise. Since 14 October 2021 we see one of the weaker peaks in the pulse profile slowly growing, indicating the ongoing state transition back to the state early in the rise of the outburst. The transition began as the 0.5-10 keV flux reached ~4e-9 erg/s/cm^2. The flux continues to decline. Its evolution is, however, more gradual than during the rise.
The NICER monitoring will continue to catch any further changes at even lower luminosities, although until November 4th only very limited observations will be possible due to visibility constraints. Follow-up observations with other instruments are therefore encouraged as the source transitions to this new accretion regime. | 2021-10-28 00:57:00 | x-ray,binary,neutron star,pulsar,star,transient | 2021-10-28 | 00:57:00 | 2,500 | [
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] | 15,004 |
15,007 | Fermi-LAT detection of enhanced gamma-ray activity from the FSRQ blazars PKS 0308-611 and OI 275 | J. Valverde (UMBC/NASA GSFC), P. V. Van Zyl (South African Radio Astronomy Observatory (SARAO)), Stefano Ciprini (INFN Roma Tor Vergata, & ASI Space Science Data Center, Rome, Italy), on behalf of the Fermi Large Area Telescope Collaboration | The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed enhanced gamma-ray activity from a source positionally consistent with the flat-spectrum radio quasar PKS 0308-611, also known as 4FGL J0309.9-6058 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 47.484 deg, Decl. = -60.977 deg (J2000; Johnston et al. 1995, AJ, 110, 880), and redshift z=1.48 (Gattano et al. 2018, A&A, 618, A80).
Preliminary analysis indicates that this source has been in an elevated gamma-ray emission state on 2021 October 24 and 25, reaching on October 25, 2021, a daily averaged gamma-ray flux (E>100MeV) of (0.6+/-0.1) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 11 relative to the average flux reported in the fourth Fermi-LAT catalog data release 2 (4FGL-DR2; Ballet et al., arXiv:2005.11208). This is the highest LAT daily flux ever observed for this source. The corresponding photon index is 2.2+/-0.2, and is consistent with the 4FGL-DR2 value of 2.49+/-0.02 within the uncertainties.
On October 23, the LAT observed enhanced gamma-ray activity from a source positionally consistent with the flat-spectrum radio quasar OI 275, also known as 4FGL J0748.6+2400 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 117.150 deg, Decl. = 24.007deg (J2000; Johnston et al. 1995, AJ, 110, 880), and redshift z=0.41 (Schneider et al. 2010, AJ, 139, 2360). Preliminary analysis indicates that on 2021 October 23, OI 275 was in a flaring state with a daily averaged gamma-ray flux (E>100MeV) of (0.3+/-0.1) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 24 relative to the average flux reported in the 4FGL-DR2. This is the highest LAT daily flux ever observed for this source. The corresponding photon index is 2.1+/-0.3, and is consistent with the 4FGL-DR2 value of 2.34+/-0.06 within the uncertainties.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of these sources will continue. We encourage multifrequency observations of these sources. For these sources, the Fermi-LAT contact people are Janeth Valverde (valverde at llr.in2p3.fr) and Pfesi Van Zyl (pfesesani at hartrao.ac.za).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. | 2021-10-28 11:45:00 | radio,gamma ray,agn,blazar,quasar,request for observations | 2021-10-28 | 11:45:00 | 2,616 | [
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] | 15,005 |
15,008 | Optical observations of V4641 Sgr during X-ray brightening in October 2021 | V. P. Goranskij, A. V. Zharova (SAI, Moscow University), E. A. Barsukova, A. N. Burenkov (Special Astrophysical Observatory, Russian Academy of Sciences) | V4641 Sgr was discovered in the outburst on 1978 Jun 9 with 12.1 mag B in maximum (Goranskij, Astron. Zirkular No.1024, 1978). However, then it was misidentified with the nearby star GM Sgr by GCVS team. First photoelectric UBV observations of V4641 Sgr were taken on 1986 Oct 4 (IBVS 3464, 1994), and first spectrum was taken with the Russian 6-m telescope BTA on 1996 Aug 21, the star was classified as A0III (Astron. Rep. V.47, 740, 2003). On 1999 Feb 20-22, V4641 Sgr was rediscovered as a weak X-ray source named SAX J1819.3-2525 or XTE J1819-254. Later the star was classified as a black hole binary. Recent X-ray brightening was detected by NICER, SWIFT and INTEGRAL on 2021 Oct 4, and its flux maximum of 20 mCrab was registered on Oct 12 (ATel #14992, 14971,14968). We performed photometry and spectroscopy in spite of incomfortable observing conditions: low location in the sky, bad transparency near the horizon and visibility time limited by about 40 min. The first photometric set was taken with the 60 cm Zeiss telescope of the SAI Crimean Station and a FLI CCD starting on 2021 Oct 17.635 and finishing on 17.672 UT (the orbital phase was 0.63 relative to the formula Min I = JD hel 2459410.4136 + 2.81728 E). The summary image gives brightness of 13.22 V, what is 0.5 mag brighter than quiet level in this phase. Another set was taken with the 1 m Zeiss telescope of the Special Astrophysical Observatory and CCD UBV(RI)c photometer starting on 2021 Oct 20.653 and finishing on 20.681 UT (phase 0.70). Measuring of 11 frames gives V = 13.094 +/-0.009, what is 0.4 mag brighter than in the quiet state. Also we have the following magnitudes in other filters: U = 13.69, B = 13.78, Rc = 12.93, Ic = 12.72. Additionally, we obtained spectra with the same 1 m telescope and UAGS spectrograph covered wavelength range between 5755 and 7160 A. The first one was taken between 2021 Oct 21.779 and 21.807 UT (phase 0.05), the second one - between Oct 22.774 and 22.806 UT (phase 0.40). Spectral resolution is 2.0 A, and dispersion is 0.69 A/pxl. Both spectra are weak and noisy, S/N relation is 4 and 8, accordingly. We smoothed the spectra with the moving average method using 5 A average interval. Both spectra show H-alpha line profile filled with emission component with a peak displaced to the red side from the center of the absorption profile by 100 and 150 km/s, correspondingly. In the second spectrum, the emission line He I 5875 A is visible with the peak at Vr(hel) = +180 km/s. The radial velocity of the mass center of V4641 Sgr system is known as 108 +/-3 km/s. The light curve and spectra are shown in the internet link. | 2021-10-28 19:14:00 | optical,x-ray,binary,black hole,star | 2021-10-28 | 19:14:00 | 2,644 | [
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] | 15,006 |
15,009 | AGILE detection of intense transient gamma-ray activity from Cygnus X-3 emerging from a prolonged quenching state | G. Piano (INAF/IAPS), F. Verrecchia, C. Pittori (SSDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Bulgarelli, V. Fioretti, N. Parmiggiani, A. Addis, L. Baroncelli, A. Di Piano (INAF/OAS-Bo), F. Lucarelli (SSDC and INAF/OAR), S. Vercellone (INAF/OA-Brera), M. Cardillo, A. Ursi, C. Casentini (INAF/IAPS), I. Donnarumma (ASI), F. Gianotti, M. Trifoglio (INAF/OAS-Bo), A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), A. Chen (Wits University), A. Argan, E. Costa, E. Del Monte, Y. Evangelista, M. Feroci, L. Foffano, I. Lapshov, E. Menegoni, L. Pacciani, P. Soffitta, V. Vittorini (INAF/IAPS), F. Lazzarotto (INAF/OAPD), G. Di Cocco, F. Fuschino, M. Galli, C. Labanti (INAF/OAS-Bo), M. Marisaldi (University of Bergen), A. Pellizzoni, M. Pilia, A. Trois (INAF/OA-Cagliari), G. Barbiellini (INFN Trieste), F. Longo (Univ. Trieste and INFN Trieste), E. Vallazza (INFN Milano Bicocca), A. Morselli, P. Picozza (INFN and Univ. Roma Tor Vergata), M. Prest (Univ. dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), A. Ferrari (Univ. Torino and CIFS), F. Paoletti (East Windsor RSD Hightstown and INAF/IAPS), L. A. Antonelli (INAF/OAR), P. Giommi, L. Salotti, G. Valentini, and F. D'Amico (ASI) | The microquasar Cyg X-3 recently emerged from a deep and prolonged quenched state, which lasted about 5 months, on October 18, 2021 (Swift/BAT, 15-50 keV; http://swift.gsfc.nasa.gov/results/transients/CygX-3/ ).
AGILE is now detecting intense transient gamma-ray emission above 100 MeV from Cygnus X-3. Integrating from 2021-10-25 UT 00:00:00 to 2021-10-29 UT 00:00:00 (MJD: 59512.0 - 59516.0), a preliminary multi-source likelihood analysis yields a detection with a gamma-ray flux F(>100 MeV) = (2.6 +/- 0.9) x 10^-6 photons/cm^2/s.
Earlier, AGILE found evidence of transient gamma-ray emission from Cyg X-3 at the beginning of the quenched state (2021 May, 24-26, MJD: 59358.875 - 59360.250, ATel #14662) and during the quenched state (2021 July, 11-13, MJD: 59406.0 - 59408.0, ATel #14780). Recently, the Nasu telescope array reported a strong radio flare of 3.4 Jy at 1.4 GHz (ATel #14989), confirming the well known correlation between gamma-ray and radio flares from Cyg X-3, when emerging from a quenched state (Tavani et al., Nature, 462, 620, 2009). Multifrequency observations of Cyg X-3 during this interesting phase are strongly encouraged.
The AGILE-GRID detection was obtained while AGILE is observing in spinning mode, surveying a large fraction of the sky each day. The source can be monitored with the public mobile application "AGILEScience" developed by the AGILE Team, available for both Android and iOS devices. | 2021-10-30 00:32:00 | radio,gamma ray,binary,black hole,transient | 2021-10-30 | 00:32:00 | 1,436 | [
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] | 15,007 |
15,010 | AstroSat observation of X-ray brightening from the black hole X-ray binary V4641 Sgr | Swadesh Chand (GGV, Bilaspur), G. C. Dewangan (IUCAA, Pune), Parijat Thakur (GGV, Bilaspur), V. K. Agrawal (URSC, ISRO, Bangalore), Prakash Tripathi (IUCAA, Pune) and Pragati Sahu (GGV, Bilaspur) | Following the MAXI/GSC detection of the X-ray brightening from the black hole binary V4641 Sgr (ATel#14968), we observed the source with AstroSat from October 19 at 17:52:01 UTC to October 22 at 18:13:33 UTC, 2021. The source is found to be variable over the full exposure time with average count rate of ~33 cts/s measured with LAXPC20. However, no signature of quasi-periodic oscillation (QPO) is observed in the power density spectra (PDS) derived from the LAXPC20 lightcurve in the 3-50 keV band. The time-averaged X-ray energy spectrum obtained from the LAXPC20 detector in the 3-20 keV band shows the presence of a strong iron line and reflection hump. The spectrum can be well described with an absorbed power-law and diskbb components along with a Gaussian line required for the iron line. The absorption column density (N_H) is about 0.3e+22 cm^-2, which is consistent with Pahari et al. (2015) and the power-law photon index is ~2.0. The best-fit inner disk temperature (KT_in) of ~1.24 keV indicates that the contribution from the disk strongly dominates the X-ray spectrum. The estimated value of the unabsorbed flux in the 3-20 keV band is ~4.4e-09 erg cm^-2 s^-1. Further analysis of this AstroSat observation is in progress. We thank the AstroSat team for granting the ToO observation, and ISSDC, ISRO for making the data available. | 2021-11-02 21:08:00 | x-ray,binary,black hole,transient,variables | 2021-11-02 | 21:08:00 | 1,347 | [
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] | 15,008 |
15,011 | Independent Discovery of a Probable Nova in M31 | K. Hornoch, H. Kucakova (Astronomical Institute, Ondrejov, Czech Republic) | We report the independent discovery of a probable nova in M31 on a co-added 990-s R-band CCD frame taken in poor seeing on 2021 Oct. 31.698 UT with the 0.65-m telescope at Ondrejov.
The object was independently discovered on Oct. 31.745 UT by M. Zhang and X. Gao and designated as PNV J00425423+4116505 = AT 2021acwv. The object was designated by us as M31N 2021-10c and is located at R.A. = 0h42m54s.27, Decl. = +41o16'50".6 (equinox 2000.0), which is 112.1" east and 42.1" north of the center of M31 (see link to discovery image below).
The following R-band magnitudes were obtained using the 0.65-m telescope at Ondrejov:
2021 Oct. 29.701 UT, [19.4; 30.701, [18.4; 31.698, 18.5 ± 0.2. | 2021-11-03 00:31:00 | optical,nova,transient | 2021-11-03 | 00:31:00 | 690 | [
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] | 15,009 |
15,012 | SRG/eROSITA observation of OI 275 during enhanced gamma-ray activity | S. Haemmerich (Remeis-Observatory/ECAP, FAU Erlangen), A. Gokus (Remeis-Observatory/ECAP, FAU Erlangen & Uni Wuerzburg), P. Weber (Remeis-Observatory/ECAP, FAU Erlangen), A. Zainab (Remeis-Observatory/ECAP, FAU Erlangen), I. Kreykenbohm (Remeis-Observatory/ECAP, FAU Erlangen), A. Rau (MPE Garching), J. Wilms (Remeis-Observatory/ECAP, FAU Erlangen) | The position of the FSRQ OI 275 (RA = 07:48:35.60, DEC = +24:00:26.24) was scanned by the eROSITA telescope (Predehl et al. 2021, A&A 647, A1) onboard the Russian/German Spectrum-X-Gamma mission (Sunyaev et al. 2021, arxiv:2104.1326) during its fourth ongoing all-sky survey between 2021 October 24 00:58 UTC and 2021 October 27 12:58 UTC. The eROSITA observation coincided with a state of enhanced gamma-ray activity detected by Fermi/LAT (Valverde et al., ATel#15007). 51 counts were collected during a total exposure of 127s.
The observed X-ray spectrum is well described by an absorbed power-law model. Fixing the equivalent neutral hydrogen column density to N_H=5.7 x 10^20 cm^-2 (HI4PI Collaboration, N. Ben Bekhti, et al., 2016, A&A 594, A116) we find a photon index of 2.0 +/- 0.5 and an absorbed 0.3-10 keV flux of (2.0 +/- 0.6) x 10^-12 erg/cm^2/s (all following values use the same band). No significant difference in the count rate between the individual scans could be observed. The average count is (0.39 +/- 0.06) counts/s.
OI 275 was also detected during the first three eROSITA all-sky surveys with the following, higher fluxes: 2020 April 19/20: (2.6 +/- 0.6) x 10^-12 erg/cm^2/s, 2020 October 22: (3.8 +/- 0.7) x 10^-12 erg/cm^2/s, and 2021 April 21: (5.0 +/- 0.6) x 10^-12 erg/cm^2/s. The spectral shape did not change significantly between the individual visits (photon indices: 2020 April: 1.6 +/- 0.4, 2020 Oct: 1.6 +/- 0.4, 2021 April: 1.61 +/- 0.23). While the FSRQ is quite variable in the X-rays, it seems to be more variable in the gamma-regime.
Multi-wavelength follow-up observations, especially with other X-ray missions, are encouraged in order to study the variability of the source on shorter time-scales. | 2021-11-03 23:37:00 | x-ray,gamma ray,agn,blazar,variables | 2021-11-03 | 23:37:00 | 1,743 | [
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] | 15,010 |
15,013 | MASTER OT J012445.52-680429.7 - new OT with ampl more then 3.5m | Ya. Kechin, K. Zhirkov, V. Lipunov, E. Gorbovskoy, P. Balanutsa, A. Kuznetsov, O. Gress, G. Antipov, D. Vlasenko, N. Tiurina, D. Zimnukhov, V. Senik, V. Topolev, A. Chasovnikov, E. Minkina, V. Grinshpun, D. Cheryasov (Lomonosov MSU), R. Rebolo, M. Serra(IAC), D. A. H. Buckley (SAAO), N. M. Budnev (ISU, API), R. Podesta, C. Lopez, F. Podesta, C. Francile (OAFA), A. Tlatov, D. Dormidontov (KSS, Pulkovo observatory), A. Gabovich, V. Yurkov (BSPU) | MASTER OT J012445.52-680429.7 discovery - new OT, ampl>3.5m (no any sources in VIZIER database)
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 01h 24m 45.52s -68d 04m 29.7s on 2021-11-03.95104 UT.
The OT unfiltered magnitude is 18.5m (mlim=20.0).
The OT is seen in 4 images (2021-11-03 22:49:30/01:10:07UT) with the same magnitude. There is no minor planet at this place. We have reference image at 2018-09-29.82959 UT with unfiltered mlim=20.8m, at 2021-09-02 02:38:45 eith mlim=19.2. So as there is no any sources in VIZIER database, it means 22m POSS limit in history and >3.5m of current outburst amplitude. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/012445.52-680429.7.png | 2021-11-04 09:46:00 | optical,cataclysmic variable,planet,transient,variables,request for observations | 2021-11-04 | 09:46:00 | 866 | [
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] | 15,011 |
15,014 | MASTER multi-wavelength and polarization observations of V4641 Sgr | K. Zhirkov, V. Lipunov, E. Gorbovskoy, P. Balanutsa, A. Kuznetsov, O. Gress, G. Antipov, D. Vlasenko, N. Tiurina, D. Zimnukhov, V. Senik, V. Topolev, A. Chasovnikov, E. Minkina, V. Grinshpun, D. Cheryasov, Ya. Kechin (Lomonosov MSU), R. Rebolo, M. Serra(IAC), D. A. H. Buckley (SAAO), N. M. Budnev (ISU, API), R. Podesta, C. Lopez, F. Podesta, C. Francile (OAFA), A. Tlatov, D. Dormidontov (KSS, Pulkovo observatory), A. Gabovich, V. Yurkov (BSPU) | MASTER Global Robotic Net ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) observed V4641 Sgr (ATel #13431, ATel #15008) more then 10 years in MASTER-Kislovodsk, -Tavrida, -IAC, -SAAO, -OAFA (monitoring during regular survey). We registered its outbursts in 2013, 2017, 2018, 2019, 2020, 2021yy in I,V,R, unfiltered, and in polarization filters.
One of the last one has m_I=10.7m at 2021-11-03 18:34:13UT (MASTER auto-detection system). | 2021-11-04 10:16:00 | optical,binary,black hole,transient,variables,request for observations | 2021-11-04 | 10:16:00 | 470 | [
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] | 15,012 |
15,015 | MASTER: PSNe, CV, XMM-SSC source outbursts and brown dwarf optical flare | K. Zhirkov, Ya. Kechin, V. Lipunov, E. Gorbovskoy, P. Balanutsa, A. Kuznetsov, O. Gress, G. Antipov, D. Vlasenko, N. Tiurina, D. Zimnukhov, V. Senik, V. Topolev, A. Chasovnikov, E. Minkina, V. Grinshpun, D. Cheryasov, Ya. Kechin, T. Pogrosheva, V. Shumkov (Lomonosov MSU), R. Rebolo, M. Serra(IAC), D. A. H. Buckley (SAAO), N. M. Budnev (ISU, API), R. Podesta, C. Lopez, F. Podesta, C. Francile (OAFA), A. Tlatov, D. Dormidontov (KSS, Pulkovo observatory), A. Gabovich, V. Yurkov (BSPU) | MASTER OT J091112.50+173344.0 detection - XMM-SSC source optical outburst AT2021acet MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 09h 11m 12.50s +17d 33m 44.0s on 2021-10-26.16918 UT with unfiltered m= 15.8m (mlim=18.8). OT is seen in 9 images, also as m=15.8 at 2021-11-02 06:34:04UT. Reference image:2019-01-12.13286 UT with unfilt.mlim=20.7m. The discovery and reference images: http://master.sai.msu.ru/static/OT/091112.50173344.0.png
MASTER OT J232742.14-403137.2 detection - possibly UVCet-type flare MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 23h 27m 42.14s -40d 31m 37.2s on 2021-10-26.12102 UT with unfiltered m=18.4m (mlim=19.6). OT is seen in 2 images. There is no OT at 2021-10-28 03:05:08UT with mlim=19.6.Previous flare found by ATLAS in 2020. We have reference image at 2020-09-17.17493 UT with mlim=20.0m. The discovery and reference: http://master.sai.msu.ru/static/OT/232742.14-403137.2.png
MASTER OT J103337.12-432158.1 detection - dwarf nova outburst MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 10h 33m 37.12s -43d 21m 58.1s on 2021-10-31.04648 UT with unfilt.m=16.7m(mlim=19.0). OT is seen in 3 images. We have reference image on 2015-02-07.04796 UT with mlim=18.9m. The discovery and reference: http://master.sai.msu.ru/static/OT/103337.12-432158.1.png
MASTER OT J095748.63+072810.4 discovery - dwarf nova outburst, ampl>3.6m AT2021acik MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 09h 57m 48.63s +07d 28m 10.4s on 2021-10-27.18875UT with unfilt.m=16.3m (mlim=18.6). The OT is seen in 12 images. We have reference images on 2020-01-27.15811UT with unfilt.mlim=19.9m, at 2021-10-23 05:12:53UT with mlim=18.5. The discovery and reference : http://master.sai.msu.ru/static/OT/095748.63072810.4.png
MASTER OT J022912.94-603526.3 discovery - PSN in 15.8"E,34.9"N from the center of PGC175158 AT2021acga MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 02h 29m 12.94s -60d 35m 26.3s on 2021-10-26.92367 UT with unfiltered m=18.8m (mlim=20.4). The OT is seen in 6 images, also at 2021-11-04 02:32:22 with unfilt. m_OT~19.2. We have reference image on 2015-02-21.86620 UT with mlim=21.2m, at 2021-09-22 00:48:03UT with m_lim=19.3, http://master.sai.msu.ru/static/OT/022912.94-603526.3.png
MASTER OT J022249.51-594639.6 discovery - brown dwarf flare MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 02h 22m 49.51s -59d 46m 39.6s on 2021-10-19.19821 UT with unfiltered m= 15.0m (mlim=18.7). The OT is seen in MASTER-OAFA images (14.34+-0.01; 15.00+-0.02) at 19th of October , and at 2021-10-26 22:10:05UT in MASTER-SAAO with m_OT~19.2m. There is no minor planet at this place. We have reference image on 2018-02-18.12096 UT with unfilt.mlim=20.3m. Images: http://master.sai.msu.ru/static/OT/022249.51-594639.6_1.png
MASTER OT J004711.21+084427.4 discovery - short OT in 4"E,4.3"S from the center of PGC1352843 MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 00h 47m 11.21s +08d 44m 27.4s on 2021-10-24.07361 UTwith unfiltered m=17.5m (mlim=18.7). The OT is seen in 2 images. Reference image:2021-08-13.17457 UT with unfilt.mlim=20.1m. Images: http://master.sai.msu.ru/static/OT/004711.21084427.4.png
For all OTs there is no minor planets at this place and deep photometry and spectral observations are required. | 2021-11-04 12:31:00 | optical,x-ray,cataclysmic variable,nova,planet,supernovae,transient,variables,request for observations | 2021-11-04 | 12:31:00 | 3,477 | [
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] | 15,013 |
15,016 | Apparent Outburst of Comet 97P/Metcalf-Brewington | Michael S. P. Kelley (Univ. of Maryland), Tim Lister (Las Cumbres Observatory), Kritti Sharma (IITB), Vishwajeet Swain (IITB), Harsh Kumar (IITB), Varun Bhalerao (IITB), G. C. Anupama (IIA), Sudhanshu Barway (IIA), on behalf of the Zwicky Transient Facility Collaboration, the LCO Outbursting Objects Key Project, and the GROWTH India Collaboration | We report an apparent outburst of comet 97P/Metcalf-Brewington discovered with the Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002) and confirmed in GROWTH-India Telescope and Las Cumbres Observatory data. ZTF observed comet 97P between 2021 Oct 22 and 2021 Nov 02 UTC. Within a 5" radius aperture, the comet initially had a near constant apparent brightness, with i=18.23+/-0.09, and 18.17+/-0.07 mag, on 2021 Oct 22 at 07:22 and Oct 25 at 07:26 UTC, respectively (PS1 photometric system). By the next observational epoch, the comet had brightened to r=17.16+/-0.03 and i=16.95+/-0.03 mag on Nov 02 at 06:27 and 07:36, respectively. At this time, the outburst ejecta was already extended out to a radius of 15.2" (19,400 km). This morphology suggests the outburst may have already been a few days old at the time of discovery. Within 15.2" radius apertures, the total post-outburst brightness was r=16.22+/-0.03 mag, with a total outburst strength of -1.5+/-0.1 mag. Follow-up observations with the GROWTH-India Telescope at the Indian Astronomical Observatory and a Las Cumbres Observatory 1-m telescope at the South African Astronomical Observatory confirm the brightening, with r=17.34+/-0.08 and 17.35+/-0.01 mag on 2021 Nov 02 at 15:36 UTC and 2021 Nov 3 at 21:53 UTC, respectively (5" radius apertures). On Nov 2, the comet was at a heliocentric distance of 2.68 au and a geocentric distance of 1.76 au.
Based on observations obtained with the Samuel Oschin Telescope 48-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
This work makes use of observations from the Las Cumbres Observatory global telescope network.
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/ | 2021-11-06 04:55:00 | optical,comet,transient | 2021-11-06 | 04:55:00 | 2,698 | [
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] | 15,014 |
15,017 | Small Apparent Outburst of Comet 29P/Schwassmann-Wachmann 1 | Michael S. P. Kelley (U. Maryland), Kritti Sharma (IITB), Vishwajeet Swain (IITB), Harsh Kumar (IITB), Varun Bhalerao (IITB), G. C. Anupama (IIA), Sudhanshu Barway (IIA) on behalf of the Zwicky Transient Facility and GROWTH India Collaborations | We report on a small apparent outburst of comet 29P/Schwassmann-Wachmann 1, as seen in Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002) and GROWTH-India Telescope data. Photometry within 5" radius apertures calibrated to the PS1 photometric system are listed in the table below. Previous ZTF photometry of comet 29P suggest coma colors of g-r=0.56 and r-i=0.24 mag, which are used to produce an effective r-band lightcurve. The data indicate an outburst strength of -0.32+/-0.05 mag, occurring between 2021 Nov 02 22:04 and Nov 03 07:45 UTC. Additional context and further observations of the event are available at the MISSION 29P website by R. Miles (British Astronomical Association), which suggest the outburst occurred between 2021 Nov 03 06:34 and 13:02 UTC, in agreement with our observations. Together, the onset time is narrowed to a 1.2 hr period between Nov 03 06:34 and 07:45 UTC.
Based on observations obtained with the Samuel Oschin Telescope 48-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/ | 2021-11-06 21:06:00 | optical,comet,transient | 2021-11-06 | 21:06:00 | 2,084 | [
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] | 15,015 |
15,018 | Continuing observations of the recent Cygnus X-3 outburst with the Nasu telescope array at 1.4GHz | K. Tsubono (Univ. Tokyo), K. Asuma (Asaka High School), K. Niinuma (Yamaguchi Univ.), K. Takefuji (JAXA) and T. Daishido (Waseda Univ.) | A new outburst from Cygnus X-3 has been continuously observed by the Nasu telescope array at 1.4GHz (ATel #14989). The burst, which began on October 19 UT, reached a peak on October 23 with the flux density of 4.8+-0.02 Jy. The light curve observed from October 19 to November 5 can be seen in the figure below. The waveform of the light curve shows rather choppy behavior among those recently obtained from Cygnus X-3.
AGILE team reported an intense transient gamma-ray activity from Cygnus X-3 integrating from 2021-10-25 UT to 2021-10-29 UT, and suggested the emergence from a deep and prolonged quenched state of Cygnus X-3 (ATel #15009). From the look of recent Swift/BAT data (15-50 keV; http://swift.gsfc.nasa.gov/results/transients/CygX-3/ ), this emergence does not seem to be conclusive yet.
The Nasu telescope array is a spatial fast Fourier transform (FFT) interferometer consisting of eight linearly aligned antennas with 20 m spherical dishes. This type of interferometer was developed to survey transient radio sources with an angular resolution as high as that of a 160 m dish and a field of view as wide as that of a 20 m dish.
Nasu telescope array HP: https://nasu-radio-telescope.space | 2021-11-06 21:43:00 | radio,gamma ray,binary,black hole,transient | 2021-11-06 | 21:43:00 | 1,207 | [
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] | 15,016 |
15,019 | Spectroscopic Classifications of Optical Transients with Keck I + LRIS | K. Taggart, S. Tinyanont, K. W. Davis, R. J. Foley (UCSC) | We report the following classifications from spectroscopic observations with the LRIS spectrograph on the Keck I telescope, made on 2021 Nov 6 UT. The targets were supplied by ALeRCE (selected from the ZTF data stream) and the Young Supernova Experiment. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure an Si II 6355 velocity of -11,900 km/s. (2) We measure an He I 5876 velocity of -10,900 km/s. (3) We measure an H-alpha absorption velocity of -10,100 km/s. (4) We measure an Si II 6355 velocity of -11,700 km/s. (5) We measure an Si II 6355 velocity of -10,500 km/s. (6) Classified as SN on TNS. We refine classification as a Ib. (7) Blue spectrum indicating an early phase. We measure an H-alpha absorption velocity of -8,900 km/s. (8) We measure an Si II 6355 velocity of -10,000 km/s. (9) We measure an Si II 6355 velocity of -11,400 km/s. (10) We measure an Si II 6355 velocity of -9,200 km/s. (11) We measure an H-alpha absorption velocity of -11,900 km/s. (12) We measure an Si II 6355 velocity of -11,200 km/s. (13) Blue continuum with faint emission features consistent with He II 4686 and N III and/or N V. | 2021-11-07 01:42:00 | optical,supernovae,transient | 2021-11-07 | 01:42:00 | 1,323 | [
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] | 15,017 |
15,020 | Enhanced HE and VHE gamma-ray activity from the FSRQ PKS 0346-27 | S. Wagner (U. Heidelberg, Germany), for the H. E.S. S. collaboration and B. Rani (KASI, S. Korea), on behalf of the Fermi Large Area Telescope Collaboration | The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed enhanced gamma-ray activity from a source positionally consistent with the flat-spectrum radio quasar PKS 0346-27, also known as 4FGL J0348.5-2749 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates RA=03h 48m 38s, Dec=-27d 49' 14'' (J2000; Beasley et al. 2002 ApJS, 141, 13), and a reported redshift of z=0.991 (White et al. 1988 ApJ, 327, 561).
The H.E.S.S. array of imaging atmospheric Cherenkov telescopes was used to carry out observations of PKS 0346-27. On November 03 (MJD 59521.9), a two hour observation shows a >5 sigma excess in the very-high-energy gamma-ray band compatible with the direction of PKS 0346-27. Preliminary analysis shows a very soft power law (photon spectral index > 4). H.E.S.S. observations are ongoing.
Preliminary analysis of the data obtained with the Fermi/LAT instrument indicates that this source was in an elevated gamma-ray emission state on November 02, 2021, with a daily averaged gamma-ray flux (E>100MeV) of (1.8+/-0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 200 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL). The corresponding photon index is 1.8+/-0.1, and is significantly smaller than the 4FGL value of 2.5+/-0.1. Previous enhanced gamma-ray activity in the source was detected on February 20, 2020 (ATel#13521).
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. Since PKS 0346-27 is in the list of monitored sources, its light curve can be found at this link https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/PKS_0346-27. For this source, the Fermi-LAT contact person is Roberto Angioni (roberto.angioni@ssdc.asi.it). We encourage multifrequency observations of this source.
H.E.S.S. is an array of five imaging atmospheric Cherenkov telescopes for the detection of very-high-energy gamma-ray sources and is located in the Khomas Highlands in Namibia. It was constructed and is operated by researchers from Armenia, Australia, Austria, France, Germany, Ireland, Japan, the Netherlands, Poland, South Africa, Sweden, UK, and the host country, Namibia. For more details see https://www.mpi-hd.mpg.de/hfm/HESS/.
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. | 2021-11-07 02:38:00 | radio,gamma ray,vhe,agn,blazar,quasar | 2021-11-07 | 02:38:00 | 2,648 | [
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] | 15,018 |
15,021 | BL Lac object PKS 0735+17 is bright in optical | S. S. Savchenko, E. G. Larionova, T. S. Grisnina (St. Petersburg univ., Russia) | We perform optical photometric and polarimetric monitoring of a sample of gamma-bright blazars using LX-200 0.4-m (Saint Petersburg state university) and 0.7-m AZT-8 telescope (Crimean Astrophysical Observatory), within the frames of GASP/WEBT project. We report that the classical BL Lac object PKS 0735+17 (z=0.424) is active in optical reaching R=14.88 at JD=2459523.5644 and with the degree of linear polarization of 8.7%. We plan to continue the monitoring of this object. The nightly updated light curve for this object can be found on our website. | 2021-11-08 21:49:00 | optical,agn,blazar,quasar | 2021-11-08 | 21:49:00 | 554 | [
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] | 15,019 |
15,022 | Radio blazar 1801+253 is associated with IceCube-210811A and flares immediately after the neutrino event | S. V. Troitsky (INR), Yu. V. Sotnikova (SAO), A. K. Erkenov (SAO), Yu. A. Kovalev (ASC Lebedev), Y. Y. Kovalev (ASC Lebedev, MIPT, MPIfR), A. V. Plavin (ASC Lebedev, MIPT), A. V. Popkov (MIPT, ASC Lebedev) | We have recently shown that VLBI-selected radio-bright AGN are highly probable neutrino associations (Plavin et al., 2020, 2021) with neutrinos being generated within their central parsec-scale region. IceCube collaboration has detected a new high-energy neutrino event with a high probability of its astrophysical origin and issued a "GOLD" alert on August 11, 2021. The closest (5' from the best-fit neutrino arrival direction) radio blazar within the error region to the IceCube-210811A event is 1801+253 (J1803+2521, J2000.0 VLBI positions according to the RFC catalog: 18:03:12.4064 +25:21:18.741), redshift is unknown. See details on the source in NASA NED. Its archival VLBI observations in 2013 at 8 GHz show a very compact jet with the parsec-scale core dominance 0.9, core size 0.4 mas, and core flux density 170 mJy. We have triggered observations of 1801+253 at the RATAN-600 telescope immediately after the neutrino detection. Observations from August 12 till November 7, 2021, show a radio flare which has started about the time of neutrino detection: the flux density at 22 GHz has raised from 97+/-10 mJy to 179+/-30 mJy. Broad-band spectral evolution between 5 and 22 GHz agrees with the expectations from a typical synchrotron flare in the VLBI core, with flux density variations at lower frequency delayed relative to 22 GHz. Namely, in August 2021 the quasar had a steep radio spectrum at low frequencies with 5-8 GHz spectral index alpha=-0.84+/-0.09 (S~nu^+alpha), and a flat spectrum at 8-22 GHz with alpha=-0.12+/-0.02. The flare resulted in an inverted spectrum with September alpha=+0.46+/-0.08 and November alpha=+0.31+/-0.07 at 8-22 GHz. The blazar is a strongly variable gamma-ray source listed in the Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data as 1FLT J1803+2523. It was present in the 3FGL catalog as 3FGL J1804.1+2532 but absent in 4FGL. Fermi LAT followup GCN of IceCube-210811A mentioned 4FGL sources only and did not discuss the 1FLT or 3FGL targets though they are well within the 90% statistical IceCube uncertainties. This blazar is the brightest within the IceCube error region on the basis of available VLBI catalogs, has shown a radio flare coincident with the neutrino event, and is a highly variable gamma-ray source. This makes it a highly probable neutrino association. We have triggered VLBA in early November 2021 which will monitor this blazar at 15, 24 and 43 GHz monthly for the next half a year. RATAN-600 monthly monitoring will continue. We encourage multi-band observations of the blazar. | 2021-11-09 04:05:00 | radio,gamma ray,neutrinos,agn,blazar,quasar,transient,variables,request for observations | 2021-11-09 | 04:05:00 | 2,575 | [
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15,023 | Optical polarimetric observations of the black hole X-ray binary V4641 Sgr | V. Kravtsov, A. Berdyugin, A. Veledina, J. Poutanen, V. Piirola (University of Turku, Finland), S. Berdyugina (Leibniz Institute for Solar Physics, Freiburg, Germany), T. Sakanoi, M. Kagitani (Tohoku University, Sendai, Japan) | Following the renewed activity of the black hole X-ray binary V4641 Sgr (ATel #14968, #14971), we performed optical polarimetric observations of the source. We have observed V4641 Sgr for 3 nights (JD 2459519.7, 2459521.7, 2459522.7) with DIPol-2 BVR polarimeter installed on the remotely controlled 60 cm Tohoku telescope (T60, Haleakala Observatory, Hawaii). Each night the source has been observed for about 1 hour allowing us to make 15 to 24 measurements of normalized Stokes parameters q and u simultaneously in B, V and R bands. The table below contains nightly average values of the linear polarization degree (PD) and polarization angle (PA), along with their measurement errors. Using observations of 6 field stars located close to the source we determined the value of interstellar polarization in the direction of V4641 Sgr, which is consistent, within errors, with our measurements of the source polarization, indicating absence of high intrinsic polarization. These values are also consistent with the previously measured quiescent-state polarization of the source (see Table 3 in Piirola et al. 2021). JD PD(%) error PA(deg) error B-band 2459519.710 0.559 0.079 38.5 4.0 2459521.714 0.538 0.079 41.8 4.2 2459522.710 0.470 0.080 42.1 4.8 V-band 2459519.710 0.362 0.145 31.9 10.9 2459521.714 0.374 0.197 45.7 13.9 2459522.710 0.484 0.127 38.6 7.4 R-band 2459519.710 0.290 0.119 46.9 11.2 2459521.714 0.581 0.094 49.5 4.6 2459522.710 0.500 0.100 44.4 5.6 | 2021-11-09 05:06:00 | optical,x-ray,binary,black hole,star,transient | 2021-11-09 | 05:06:00 | 1,466 | [
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] | 15,021 |
15,024 | Fermi-LAT and Swift observations of flaring activity from the FSRQ PKS 0301-721 | G. La Mura (LIP), J. Valverde (UMBC/NASA GSFC), P. V. Van Zyl (SARAO/WITS), on behalf of the Fermi Large Area Telescope Collaboration | On October 12, 2021, the Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, observed increased gamma-ray activity from a source positionally consistent with the flat-spectrum radio quasar PKS 0301-721, also known as 4FGL J0301.6-7155 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 45.410 deg, Decl. = -71.943 deg (J2000; Li & Jin 1996, A&AS, 120, 201), and redshift z=0.823 (Titov et al. 2013, AJ, 146, 10). Following a preliminary analysis that resulted in a daily average flux (E>100MeV) of (1.44 +/- 0.20) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only) with photon index 1.9+/-0.1, a Swift ToO request was submitted.
Swift executed two observations of the source in photon counting mode, on October 19 and October 22, accumulating, respectively, 3071.34s and 3415.07s of XRT exposure times. An X-ray source positionally consistent with PKS 0301-721 was detected in both visits. Preliminary analysis suggests that the source could be modeled with an absorbed power-law, using a fixed Galactic Hydrogen column density of 4.68 X 10^20 cm^-2 (Willingale et al. 2013, MNRAS, 431, 394). On October 19, the X-ray data in the 0.3-10keV band resulted in a flux estimate of (2.69+/-0.39) X 10^-12 erg cm^-2 s^-1, with a photon index of 1.7+/-0.2 (statistical uncertainty only). On October 22, the estimated flux had decreased to (2.14+/-0.39) X 10^-12 erg cm^-2 s^-1, with a photon index of 1.5+/-0.2. The source is listed in the 2SXPS catalogue with a flux estimate of 0.67 X 10^-12 erg cm^-2 s^-1 (Evans et al. 2020, ApJS, 247, 54).
The LAT monitoring provided simultaneous coverage of the gamma-ray evolution of this flare. On October 19, the source was detected with a daily averaged gamma-ray flux (E>100MeV) of (0.2+/-0.1) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only), being 20 times brighter than the average flux reported in the fourth Fermi-LAT catalog (4FGL). On October 22, it was detected with a daily averaged gamma-ray flux (E>100MeV) of (0.4+/-0.1) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only), being 40 times brighter than the 4FGL average level.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. This source is included in the "LAT Monitored Sources" and, consequently, a preliminary estimation of the daily gamma-ray flux observed by Fermi-LAT will be publicly available ( http://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/ ). We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact people are Pfesi Van Zyl (pfesesani at hartrao.ac.za) and Janeth Valverde (valverde at llr.in2p3.fr).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. We further acknowledge commitment of the Swift Team, Observatory Duty Scientists, and PI, who made these observations possible. | 2021-11-09 05:25:00 | radio,x-ray,gamma ray,agn,blazar,quasar,transient | 2021-11-09 | 05:25:00 | 3,124 | [
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] | 15,022 |
15,025 | Spectroscopic classification of SN 2021adgz with Gemini-North/GMOS | M. R. Siebert, R. J. Foley (UC Santa Cruz), Qinan Wang (JHU) | We report the classification of SN 2021adgz with the GMOS spectrograph on the Gemini-North Telescope with GMOS on UT 2021 Nov 5. The target was supplied by ALeRCE using the ZTF data stream. The classification was performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure an H-alpha absorption velocity of -10,800 km/s | 2021-11-09 05:59:00 | optical,supernovae,transient | 2021-11-09 | 05:59:00 | 487 | [
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] | 15,023 |
15,026 | Spectroscopic Classifications of Optical Transients with the Lick Shane telescope | C. Rojas-Bravo, K. Taggart, R. J. Foley (UCSC) | We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. The targets were supplied by The Young Supernova Experiment, ZTF and Gaia. All observations were made on 2021 Nov 8 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure a H-alpha absorption velocity of -11,200 km/s. (2) We measure a Si II 6355 velocity of -10,700 km/s. (3) We measure a Si II 6355 velocity of -11,100 km/s. | 2021-11-09 06:15:00 | optical,supernovae,transient | 2021-11-09 | 06:15:00 | 668 | [
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] | 15,024 |
15,027 | Swift monitoring of the high-z FSRQ PKS 0438-43 | Filippo D'Ammando (INAF-IRA Bologna) | We are carried out an X-ray monitoring of the high-redshift (z = 2.852) flat spectrum radio quasar PKS 0438-43 with the Neil Gehrels Swift satellite. Observations have been performed on 2021 October 2, 9, 25, 29, and November 8.
Swift-XRT data were taken in Photon Counting mode on 2021 October 2, 9, 25, 29 and November 8 for a net exposure of about 2.7, 2.9, 2.5, 2.4, and 1.8 ksec, respectively. The X-ray spectrum (0.3-10 keV) can be fit by an absorbed power law model with a HI column density consistent with the Galactic value in the direction of the source (n_H = 1.28 x 10^21 cm^-2, Ben Bekhti N. et al., 2016, A&A, 594, A116) and a photon index of 1.68 +/- 0.14, 1.68 +/- 0.11, 1.64 +/- 0.11, 1.68 +/- 0.15, and 1.55 +/- 0.12, respectively. The corresponding unabsorbed 0.3-10 keV flux observed on 2021 October 2, 9, 25, 29, and November 8 is (6.7 +/- 0.5)x10^-12, (10.4 +/- 0.6)x10^-12, (10.7 +/- 0.7)x10^-12, (9.7 +/- 0.7)x10^-12, and (16.8 +/- 1.8)x10^-12 erg cm^-2 s^-1, respectively.
As a comparison, the summed spectrum of the source collected between 2010 December 26 and 2011 January 7 (for a total exposure of 4.7 ks) and between 2016 December 15-21 (for a total exposure of 2.9 ks) can be well fitted by an absorbed power-law with a photon index of 1.61 +/- 0.26 and 1.37 +/- 0.12, respectively. The corresponding unabsorbed 0.3-10 keV flux of the source is (1.2 +/- 0.2)x10^-12 and (9.6 +/- 0.6)x10^-12 erg cm^-2 s^-1, respectively.
PKS 0438-43 has been observed by Swift-XRT in 2021 October during a high X-ray activity period, with fluxes comparable to the value observed on 2018 December, at the time of a gamma-ray flaring activity (ATel #9854), and a relatively softer photon index. On 2021 November 8, the source reached the historical maximum in X-rays.
In consideration of the ongoing activity of this source, confirmed also by the Swift-XRT observations, we encourage further multi-wavelength observations. Further Swift observations of the source are planned on 2021 November 12 and 16.
We would like to thank the Swift Team, the Swift ODS, and the PI for making these observations possible. | 2021-11-10 01:10:00 | radio,x-ray,gamma ray,agn,black hole,blazar,quasar,request for observations | 2021-11-10 | 01:10:00 | 2,126 | [
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] | 15,025 |
15,028 | Fermi-LAT detection of renewed gamma-ray activity from the FSRQs B2 0748+33 and PKS 0438-43 | I. Mereu (INFN Perugia) on behalf of the Fermi Large Area Telescope Collaboration | The Large Area Telescope (LAT), one of two instruments on the Fermi Gamma-ray Space Telescope, has observed strong gamma-ray emission from a source positionally consistent with the flat-spectrum radio quasar B2 0748+33, also known as 4FGL J0752.2+3313 (The Fermi-LAT Collaboration 2020, ApJS, 247, 33) and from a source positionally consistent with the flat-spectrum radio quasar PKS 0438-43, also known as 4FGL J0440.3-4333 (The Fermi-LAT Collaboration 2020, ApJS, 247, 33). B2 0748+33 has coordinates R.A. = 117.9736383 deg, Decl. = 33.2221719 deg (J2000; Petrov & Taylor 2011 AJ 142, 89) and redshift, z=1.9352 (Schneider et al. 2010 AJ 139, 2360). PKS 0438-43 has coordinates R.A. = 70.0715829 deg, Decl. = -43.5523894 deg (J2000; Johnston et al. 1995 AJ 110, 880) and redshift, z=2.852 (Morton et al. 1978 MNRAS 185, 735).
Preliminary analysis indicates that B2 0748+33 was in an elevated gamma-ray emission state on 2021 November 8, with a daily averaged gamma-ray flux (E>100MeV) of (6+/-2) X 10^-7 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of about 70 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL). The corresponding photon index is 2.9+/-0.4, and is consistent with the 4FGL value of 2.67+/-0.11. This is the second time that the Fermi-LAT Collaboration has announced flaring gamma-ray behavior from B2 0748+33 (see ATel #9590).
Preliminary analysis indicates that PKS 0438-43 was in an elevated gamma-ray emission state on 2021 November 8, with a daily averaged gamma-ray flux (E>100MeV) of (1.0+/-0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of about 160 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL). The corresponding photon index is 2.6+/-0.3, and is consistent with the 4FGL value of 2.76+/-0.16. This is the third time that the Fermi-LAT Collaboration has announced flaring gamma-ray behavior from PKS 0438-43 (see ATel #9854 and ATel #14446). This flaring activity is also detected by Swift in X-rays and reported in ATel #15027.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of these sources will continue. B2 0748+33 and PKS 0438-43 are part of the "LAT Monitored Sources" and their light curves are available at the Fermi Science Support Center page (see http://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/ ). We encourage multifrequency observations of these sources. For these two sources, the Fermi-LAT contact person is C. C. Cheung (Teddy.Cheung at nrl.navy.mil).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. | 2021-11-10 23:41:00 | radio,x-ray,gamma ray,agn,blazar,quasar,transient,request for observations | 2021-11-10 | 23:41:00 | 2,899 | [
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] | 15,026 |
15,029 | Swift follow-up observations of the AGN PKS 0521-36 | F. D'Ammando (INAF-IRA Bologna) and I. Mereu (INFN Perugia) | Following the high gamma-ray activity of the AGN PKS 0521-36 detected by Fermi-LAT on 2021 November 8 (see Fermi-LAT Monitored Source List Light Curves ), we performed a Swift target of opportunity observation on November 10.
Swift/XRT data were taken in Photon Counting mode for a total exposure of 1.9 ksec. The X-ray spectrum (0.3-10 keV) can be fit by an absorbed power law model with a HI column density consistent with the Galactic value in the direction of the source (n_H = 3.58 x10^20 cm^-2, Kalberla et al. 2005, A&A, 440, 775) and a photon index of 1.47+/-0.09. The corresponding 2-10 keV flux is (2.01+/-0.13) x10^-11 erg cm^-2 s^-1, comparable to the highest fluxes observed in 2010 June-July at the time of a previous gamma-ray flaring activity (see D'Ammando et al. 2015, MNRAS, 450, 3975).
Simultaneous Swift/UVOT observations were performed on 2021 November 10. The measured magnitudes are B = 15.59 +/- 0.05, U = 15.02 +/- 0.06, W1 = 15.23 +/- 0.04, and W2 = 15.48 +/- 0.09. As a comparison, UVOT observed magnitudes during 2008-2011 ranges between B = 16.05-15.12, U = 15.63-14.49, W1 = 15.81-14.54, and W2 = 15.97-14.54, suggesting a moderate increase of activity on 2021 November 10 also in optical and UV bands.
In consideration of the ongoing activity of this source, confirmed also by the Swift observations, we strongly encourage further multi-wavelength observations. Further Swift observations of the source are planned on 2021 November 12 and 14.
We would like to thank the Swift Team, the Swift ODS, and the PI for making these observations possible. | 2021-11-12 05:54:00 | optical,ultra-violet,x-ray,gamma ray,agn,black hole,blazar,request for observations | 2021-11-12 | 05:54:00 | 1,583 | [
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] | 15,027 |
15,030 | Discovery of 10 ASAS-SN Supernova Candidates | J. Brimacombe (Coral Towers Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand), I. Cruz (Cruz Observatory), P. Vallely, K. Z. Stanek, C. S. Kochanek, C. Christy, M. Rizzo Smith, S. Bose, T. A. Thompson (Ohio State), B. J. Shappee (IfA-Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus), P. Pearl (The Gap Observatory, BOSS) | During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014), using data from the quadruple 14-cm telescopes "Brutus" in Haleakala, Hawaii, "Leavitt" in Fort Davis, Texas, "Payne-Gaposchkin" in Sutherland, South Africa, and "Cassius" and "Paczynski" in Cerro Tololo, Chile, we discovered several new transient sources. Properties of these sources, as well as associated finding charts showing the archival imaging (left) and the follow-up confirmation image (right) are included in the table below:
Follow-up observations are encouraged.
While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-21xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-21xx (AT 2021xyz) to preserve, rather than anonymize, the origin of the transient.
We would like to thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grants GBMF5490 and GBMF10501, NSF grant AST-1908570, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Chinese Academy of Sciences South America Center for Astronomy (CASSACA), and the Villum Fonden (Denmark). For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients. | 2021-11-13 03:25:00 | optical,supernovae,transient | 2021-11-13 | 03:25:00 | 1,513 | [
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] | 15,028 |
15,031 | Another Fast NIR Flare of the Blazar BZQJ0237+2848 | L. Carrasco, E. Recillas, G. Escobedo, A. Porras, D. Mayya, V. Chavushyan (INAOE, Mexico) | We report on a new NIR flare of the high redshift blazar (z=1.213) [hb89]0234+285 also known as BZQJ0237+2848, cross-correlated with the radio source 4C+28.07 and the Gamma-ray source 3FGLJ0237.9+2848. On October 14th,2021 JD(2459502.959), we found the source with NIR fluxes corresponding to J = 13.729 +/- 0.06, H = 12.849 +/- 0.06 and Ks= 12.011 +/- 0.05. While on JD 2458778.91 the flux in the H band corresponded to H = 16.117 +/- 0.04. Hence, the source has increased its flux by a factor of 20, in this lapse. The source has shown flaring activity in the past (see ATel #10034, #11261, #12111, #12321,#12401,#12494) Our observations are carried out with the 2.1m telescope of the Guillermo Haro Observatory operated by the National Institute for Astrophysics, Optics and Electronics (Mexico), equipped with the instrument CANICA a NIR camera. We encourage further multi-wavelength coverage. | 2021-11-13 07:02:00 | radio,infra-red,optical,gamma ray,agn,blazar,transient | 2021-11-13 | 07:02:00 | 897 | [
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] | 15,029 |
15,032 | MASTER OT J090646.70-352527.7 - new OT, ampl>2m | K. Zhirkov, Ya. Kechin, V. Lipunov, E. Gorbovskoy, P. Balanutsa, A. Kuznetsov, O. Gress, G. Antipov, D. Vlasenko, N. Tiurina, D. Zimnukhov, V. Senik, V. Topolev, A. Chasovnikov, E. Minkina, V. Grinshpun, D. Cheryasov, Ya. Kechin, T. Pogrosheva, V. Shumkov (Lomonosov MSU), R. Rebolo, M. Serra(IAC), D. A. H. Buckley (SAAO), N. M. Budnev (ISU, API), R. Podesta, C. Lopez, F. Podesta, C. Francile (OAFA), A. Tlatov, D. Dormidontov (KSS, Pulkovo observatory), A. Gabovich, V. Yurkov (BSPU) | MASTER OT J090646.70-352527.7 discovery - new OT, no VIZIER data, ampl>2m During Fermi GRB 211109A inspection (Fermi GCN #31058, Lipunov et al. GCN #31059, see S.Barthelmy https://gcn.gsfc.nasa.gov/other/211109A.gcn3 ) MASTER covered error box (cover map) and 25h after the trigger time(00:39:44 UT on 9 Nov 2021) found optical transient, not presented in VIZIER database, not presented in automatic MASTER archive light curve since Jan 2012 (up to 14m) and in Dec 2014 (up to 20.2).
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 09h 14m 19.63s -34d 12m 36.4s on 2021-11-10.06995 UT. The OT unfiltered magnitude is 19.2m (mlim=18.5). The OT is seen in 3 images (2021-11-10 01:40:44-02:14:52). There is no minor planet at this place. We have reference image on 2020-02-15.01297 UT with unfiltered mlim= 20.2m. From POSS limit (22) the magnitude is >2m (and the second scenario is dwarf nova outburst).
Deep photometry and Sp are required. The reduction and analysis will be continued | 2021-11-13 20:51:00 | optical,gamma ray,cataclysmic variable,gamma-ray burst,nova,planet,transient,variables,request for observations | 2021-11-13 | 20:51:00 | 1,090 | [
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15,033 | MAXI/GSC detection of a new outburst from NGC 6440 | H. Negoro (Nihon U.), M. Ishikawa (JAXA), M. Nakajima, K. Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, K. Komachi, H. Hiramatsu, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, M. Niwano, R. Hosokawa (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Tominaga, T. Nagatsuka, T. Kurihara (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, Y. Goto, R. Uematsu, K. Inaba (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, Y. Nonaka, T. Sato, R. Hatsuda, R. Fukuoka (Miyazaki U.), T. Kawamuro (UDP/NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), and M. Sugizaki (NAOC) | At 13:31 on November 13, 2021, the MAXI/GSC nova-alert system triggered on a faint X-ray transient at (R.A., Dec.) = (267.423 deg, -20.467 deg), which is at about 0.22 arc-degree from the center of the globular cluster NGC 6440. Due to a data processing problem, we can not obtain a precise source position. A typical uncertainty of the trigger position is about 0.37 arc-degree (1-sigma, Negoro et al. 2016, PASJ, 68, S1). MAXI/GSC data show that the outburst started on November 10 (MJD 59528), and the 4-10 keV flux increased to about 30 mCrab on November 12. At least 24 X-ray sources are present in NGC 6440 (Pooley et al. 2002, ApJ, 573, 184). After MAXI began the observation in August 2009, the accreting millisecond pulsar, AMP, SAX J1748.9-2021 (CX1) exhibited two bright (~250-300 mCrab) outbursts in December 2009 (Suzuki et al., ATel #2360) and February 2015 (Kuulkers et al., ATel #7098), and a faint one in October 2017 (Negoro et al. ATel #10821). Another transient AMP NGC X-2 (a.k.a. CXOGlb J174852.7-202124) was also discovered in July 2009 (Heinke et al. ATel #2139; Altamirano et al. 2010, ApJ 712, L58; Heinke et al. 2010, ApJ 714, 894), and showed frequent outbursts, e.g., in March 2010 (Altamirano et al., ATel #2500) and June 2010 (Patruno et al., ATel #2672). SAX J1748.9-2021 sometimes showed X-ray bursts, but no X-ray burst has been detected from this transient source, yet. The nature of this transient is unknown, and we tentatively name the source MAXI J1749-204. Followup observations are encouraged. | 2021-11-14 19:33:00 | x-ray,black hole,globular cluster,neutron star,nova,pulsar,star,transient | 2021-11-14 | 19:33:00 | 1,534 | [
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] | 15,031 |
15,034 | Recurrent Nova M31N 2008-12a: discovery of the 2021 eruption | K. Itagaki (Itagaki Observatory), T. Vanmunster (AAVSO), F. Watanabe (Nayoro Observatory), J.-L. G. Carballo (Observadores de Supernovas, AAVSO, Cerro del Viento Observatory), K. Matsumoto (Osaka Kyoiku University), H. Naito (Nayoro Observatory), M. W. Healy (LJMU), M. J. Darnley (LJMU), S. C. Williams (Turku), S. Kafka (AAVSO), A. W. Shafter (SDSU), M. Henze (SDSU), on behalf of the 12a Collaboration | We report the discovery of the predicted 2021 eruption of the remarkable recurrent M31 nova M31N 2008-12a (see ATels #5607, #6527, #7964, #9848, #11116, #12177, #13269, #14130 for earlier detections as well as Darnley et al. 2014, 2015, 2016 and Henze et al. 2014, 2015a, 2015b, 2018, for comprehensive multi-wavelength studies of previous eruptions).
The nova was clearly detected on 2021 Nov 14.3784 (UT) with an unfiltered discovery magnitude of 18.7 at the Itagaki Observatory (Okayama, Japan). We will continue to monitor the nova light curve and strongly encourage additional follow-up observations. We have also triggered our pre-approved Swift campaign for UV/X-ray follow-up. It is likely that the nova was discovered during its one day rise to a peak magnitude of around 18.2 mag in the R-band.
Below we report a number of additional observations:
Date UTExp. timeFilterMagnitudeObserverSite 2021 Nov 7.50240 secRc>19.3K. Matsumoto(*1) 2021 Nov 13.01341200 sec (120s x 10)none>20.5J.-L. G .Carballo(*2) 2021 Nov 13.0238300 secV+R>21.1M. J. Darnley(*3) 2021 Nov 13.45011290 sec (30s x 43)none>18.0F. Watanabe(*4) 2021 Nov 13.7604300 secV+R>18.9T. Vanmunster(*5) 2021 Nov 14.37860 secnone18.7K. Itagaki(*6) 2021 Nov 14.39060 secnone18.5K. Itagaki(*6) 2021 Nov 14.47560 secnone18.5K. Itagaki(*6)
*1 Osaka Kyoiku University, Japan; 0.51-m f/12 telescope + SBIG STXL-6303E CCD *2 Pla D'Arguines Observatory Castellón, Spain; LX200 16 ACF f7.3, CCD SBIG STL-1001 *3 Liverpool Telescope, La Palma; 2.0-m f/10 Ritchey-Chrétien + RISE, an Andor DW485 which houses an E2V CCD 47-20 frame transfer device *4 Nayoro Observatory, Japan; 0.4-m f/10 Meili telescope + SBIG STL-1001E *5 AAVSO VMT *6 Itagaki Observatory (Okayama station), Japan; 0.35-m f/11 reflector + KAF-1001E
We strongly encourage observations particularly spectroscopic. | 2021-11-14 20:42:00 | optical,x-ray,nova,transient | 2021-11-14 | 20:42:00 | 1,841 | [
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] | 15,032 |
15,035 | Spectroscopic Classification of TCP J17242302+3258109 as a Dwarf Nova | Kenta Taguchi, Keisuke Isogai, Miho Kawabata (Kyoto University), Hiroyuki Maehara (National Astronomical Observatory of Japan) | We report our spectrum of TCP J17242302+3258109 discovered by Hideo Nishimura. We obtained a low-resolution spectrum from 2021-11-14.3756 UT to 2021-11-14.3886 UT using the fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019) mounted on the 3.8 m Seimei telescope (Kurita et al. 2020) at Okayama Observatory of Kyoto University.
As reported to CBAT, this object was discovered by Hideo Nishimura at 13.3 mag (unfiltered) on 2021-11-13.3797. Before the discovery, he had also detected the object at 13.8 mag (unfiltered) on 2021-11-11.391, which is the oldest detection of this transient as far as we know. According to the ASAS-SN light curve, this object was fainter than 16.121 g-mag on 2021-11-10.0391581 and was at 13.038 mag on 2021-11-12.0473. Notably, there are no past such outbursts recorded in the ASAS-SN light curve. Katsumi Yoshimoto reported a more precise position of this object, (17:24:22.92, +32:58:12.5), confirming that the position of this object is identical to that of ZTF19aarpgwg. According to PS1 Mean object catalog, there is a star of g = 21.51, r = 21.37, i = 21.38, and z = 20.91 at that position. NUV = 21.700 is also recorded for this star by GALEX DR5.
Our spectrum is dominated by a blue continuum. Also, the Balmer lines (Hα, Hβ, and Hγ), the He II line (4686 Å), and the Bowen component are detected. While the Hα, He II, and the Bowen component show emission profiles, the Hγ line shows an absorption profile, and the Hβ line does a mixture of a narrower emission component and a broader absorption one. These spectroscopic characteristics and blue progenitor manifest that this object is a dwarf nova. Such a large amplitude (∼ 8.5 g-mags, comparing the PS1 data and ASAS-SN maximum) strongly suggests that this dwarf nova is a WZ Sge-type one. | 2021-11-15 04:17:00 | optical,cataclysmic variable,nova,star,transient,variables | 2021-11-15 | 04:17:00 | 1,807 | [
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] | 15,033 |
15,036 | Spectroscopic Confirmation of the 2021 Eruption of the Recurrent Nova M31N 2008-12a | R. M. Wagner (LBTO/Ohio State U.), C. E. Woodward (U. Minnesota), S. Starrfield (Arizona State U.), B. Rothberg (LBTO), O. Kuhn (LBTO) | In ATEL #15034, Itagaki et al. reported the discovery of the predicted 2021 eruption of the recurrent M31 nova M31N 2008-12a on 2021 Nov 14.3784 UT at an unfiltered magnitude of 18.7 at the Itagaki Observatory. We confirm the 2021 eruption based on an optical spectrum (range: 320-1010 nm; resolution 0.35 nm) obtained on 2021 Nov 15.2071 UT with the 2 x 8.4 m Large Binocular Telescope (+MODS). The spectrum exhibits broad emission lines of the Balmer series of hydrogen (Hα, Hβ, Hγ, and Hδ), He I (447.1, 492.2, 501.5, 587.5, 667.8, and 706.5 nm), N III (463.8 nm), and N II (568.0 nm) superposed on a blue continuum. We measure the FWHM of Hα and Hβ emission to be 2560 and 2300 km/s respectively and the FWZI of Hβ emission to be about 4420 km/s. The spectrum is similar to the early optical spectra of M31N 2008-12a presented by Darnley et al. (2015, A&A, 580, A45) for the 2014 eruption and by Henze et al. (2018, ApJ, 857, 68) for the 2016 eruption. Our observations are continuing. | 2021-11-15 17:13:00 | optical,nova,transient | 2021-11-15 | 17:13:00 | 989 | [
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] | 15,034 |
15,037 | Recurrent Nova M31N 2008-12a: Pre-detection upper limit and multicolor follow-up observations of 2021 eruption with XMO-NEXT | Hanjie Tan (Astronomical Institute of Charles University), Mi Zhang, Jingyuan Zhao, Jiangao Ruan, Guoyou Sun (Xingming Observatory), Xing Gao (Urumqi No. 1 Senior High School) | We report the pre-detection upper limit and multicolor follow-up of the recurrent nova M31N 2008-12a using the 0.60-m Ningbo Bureau of Education and Xinjiang Observatory Telescope (NEXT) at Xingming Observatory, China.
All multicolor observations listed below were obtained in the B, V, g, r, i, z filters between 2021-11-14 15h UT and 20h UT, and calibrated by secondary standards in the field (cf. Darnley et al. 2016). The unfiltered observations were calibrated by same standard stars in V band.
Nothing was visible at this nova position on 2021-11-13.9641 UT with an upper limit of V > 19.0 mag. Together with the discovery on 2021-11-04.378 (ATel #15034), our non-detection constrains the outburst time with an uncertainty of 0.41 days.
Our observations show the nova with a significant decay since its peak, especially in B band. The rising in i-band, and B-V color changes from 0.05 mag to 0.30 mag, indicating the nova is turning redder. | 2021-11-15 18:10:00 | optical,nova,star,transient | 2021-11-15 | 18:10:00 | 949 | [
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] | 15,035 |
15,038 | GROWTH-India telescope follow-up of 2021 eruption of recurrent nova M31N 2008-12a | Judhajeet Basu (IIA), Harsh Kumar (IITB), G. C. Anupama (IIA), Sudhanshu Barway (IIA), Vishwajeet Swain (IITB), Varun Balerao (IITB), Jigmat Tstenzin (IIA), Rigzin Norbu (IIA) (on behalf of the GIT team) | We report preliminary magnitudes for 2021 eruption of recurrent Nova M31N 2008-12a (ATEL #15034) observed under poor sky conditions, using the 0.7m robotic GROWTH-India telescope at the Indian Astronomical Observatory on 14 November 2021.
JD (Start) | Filter | Magnitude (AB) 2459533.231009 | g' | 18.28 +/- 0.13
2459533.234688 | r' | 18.35 +/- 0.12
2459533.238388 | i' | 18.59 +/- 0.20
The magnitudes are calibrated against PanSTARRS (Flewelling et al., 2018) and not corrected for Galactic extinction.
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/. | 2021-11-15 22:38:00 | optical,nova | 2021-11-15 | 22:38:00 | 1,019 | [
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] | 15,036 |
15,039 | Follow-up Spectroscopy and Photometry of the 2021 Eruption of the Recurrent Nova M31N 2008-12a | Kenta Taguchi (Kyoto University), Miho Kawabata (Kyoto University), Keisuke Isogai (Kyoto University), Yasuo Sano, K. Itagaki (Itagaki Observatory), Hiroyuki Maehara (National Astronomical Observatory of Japan) | We report follow-up spectroscopy and photometry of the 2021 eruption of the recurrent nova M31N 2008-12a (ATel #15034, #15036, #15037, #15038). We obtained a low-resolution spectrum of the nova on 2021-11-14.43 UT using the fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019) mounted on the 3.8-m Seimei telescope (Kurita et al. 2020) at Okayama Observatory of Kyoto University. The spectrum shows broad Hα, He I (5876 Å), and N III emission lines (4640 Å) as reported in ATel #15036.
We also performed multicolor photometry of the nova. The magnitudes are given in the table below. | 2021-11-16 01:33:00 | cataclysmic variable,nova,variables | 2021-11-16 | 01:33:00 | 607 | [
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] | 15,037 |
15,040 | Recurrent Nova M31N 2008-12a: Swift UVOT detection of the 2021 eruption | M. J. Darnley (LJMU), K. L. Page (Leicester) on behalf of the 12a Collaboration | The 2021 eruption of the annual recurrent nova M31N 2008-12a was reported in ATel #15034, with spectroscopic confirmation report in ATel #15036. Subsequent observations have also been reported in ATels #15037, #15038, and #15039.
Here we report the first photometry of the 2021 eruption collected by the UVOT instrument on board the The Neil Gehrels Swift Observatory. The first observation (1-ks) was taken on 2021 Nov 15.546 (UT). The observation was taken using the UVW2 filter through which M31N 2008-12a had an apparent (Vega) magnitude of 17.69 ± 0.06 (statistical) ± 0.03 (systematic).
This is consistent with a Swift observation taken at a similar time following the 2020 eruption (ATel #14142).
In this observation there were not any X-rays detected from the target by the XRT instrument. The upper limits are 8.7e-03 counts/sec, again consistent with 2020, and as expected at this time.
These Swift observations were taken as part of an approved GI programme and will continue until 2021 Dec 5. We wish to thank the Swift Team for the extremely rapid and efficient scheduling of the ToO observations, in particular B. Cenko and J. A. Kennea, the duty scientists, and the science planners. | 2021-11-16 04:07:00 | ultra-violet,x-ray,nova,transient | 2021-11-16 | 04:07:00 | 1,202 | [
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] | 15,038 |
15,041 | Swift detection of record X-ray flare of the AGN PKS 0521-36 | F. D'Ammando (INAF-IRA Bologna) | After the increase of activity observed in optical, UV, and X-rays by Swift on 2021 November 10 (ATel #15029), a new Swift observation of the AGN PKS 0521-36 was performed on November 15.
Swift/XRT data were taken in Photon Counting mode for a total exposure of 2.5 ksec. Taking into consideration the Swift/XRT observations performed during 2005-2021, PKS 0521-36 reached on 2021 November 15 the highest count rate in the 0.3-10 keV energy range observed so far (see Swift-XRT Monitoring of Fermi-LAT Sources of Interest; Stroh & Falcone, 2013, ApJS, 207, 28).
Preliminary analysis has been performed fitting the X-ray spectrum in the 0.3-10 keV energy range with an absorbed power-law with the Galactic absorption corresponding to a hydrogen column density of n_H = 3.58 x10^20 cm^-2 (Kalberla et al. 2005, A&A, 440, 775) and a photon index of 1.40 +/- 0.07. The corresponding 2-10 keV flux is (3.53 +/- 0.17) x10^-11 erg cm^-2 s^-1, showing an increasing trend of the flux with respect to Swift/XRT observations performed on 2021 November 10 and a flux higher than the peak value observed in 2010 June, at the time of a previous gamma-ray flaring activity (see D'Ammando et al. 2015, MNRAS, 450, 3975).
Simultaneous Swift/UVOT observations were performed on 2021 November 15. The measured magnitudes are V = 14.56 +/- 0.04, B = 15.20 +/- 0.05, U = 14.60 +/- 0.05, W1 = 14.76 +/- 0.06, M2 = 14.86 +/- 0.06, and W2 = 14.97 +/- 0.06, showing an increase of activity also in optical and UV bands with respect to Swift/UVOT observations performed on 2021 November 10 (ATel #15029).
In consideration of the ongoing activity of this source shown by the Swift observations, we strongly encourage further multi-wavelength observations.
We would like to thank the Swift Team, the Swift ODS, and the PI for making these observations possible. | 2021-11-16 22:36:00 | optical,ultra-violet,x-ray,gamma ray,agn,black hole,blazar,quasar | 2021-11-16 | 22:36:00 | 1,839 | [
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15,042 | Search for counterpart to IceCube-211116A with ANTARES | Alexis Coleiro (APC/Universite de Paris) and Damien Dornic (CPPM/CNRS) on behalf of the ANTARES Collaboration | Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported bronze track event IceCube-211116A (GCN#31085). The reconstructed origin was 47 degrees below the horizon for ANTARES at the time of the alert. No muon neutrino candidate events were recorded within 90% error box of the IceCube event during a +/- 1h time-window centered on the IceCube event time, and over which the potential source remained visible with a limited lifetime of ~50% due to acquisition instabilities. This leads to a preliminary 90% confidence level upper limit on the muon-neutrino radiant fluence from a point source of about 16 GeV.cm^-2 over the energy range 3 TeV â3.5 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and 26 GeV.cm^-2 (640 GeV - 320 TeV) for an E^-2.5 spectrum. A search over an extended time window of +/- 1 day has also yielded no detection (50% visibility with ~40% lifetime). ANTARES [http://antares.in2p3.fr/] is the largest undersea neutrino detector (Mediterranean Sea) and it is primarily sensitive to astrophysical neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky. | 2021-11-17 20:42:00 | tev,neutrinos | 2021-11-17 | 20:42:00 | 1,321 | [
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15,043 | Spectroscopic Confirmation of Gaia21efs as a Microlensing Event | Kenta Taguchi, Junpei Ito (Kyoto University), Claudio Balcon (Belluno A. O., ISSP), Keisuke Isogai (Kyoto University) | We report our spectra of Gaia21efs = AT 2021ziw. We performed spectroscopy on 2021-11-02,847, 2021-11-04.818, and 2021-11-08.864 UT using the FOSC-ES32 spectrograph attached to a 0.2m telescope at Belluno A. O., and on 2021-11-07.392 UT using the fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019) mounted on the 3.8-m Seimei telescope (Kurita et al. 2020) at Okayama Observatory of Kyoto University.
As reported to Gaia Alerts, this object was alerted at 15.39 mag (Gaia G band) on 2021-09-10.715 UT. Before the alert, this object had an average magnitude of 15.76(2) mag (Gaia G band). According to ASAS-SN Sky Patrol, this object was the brightest at 13.756 g-mag on 2021-11-02.2651567, to which time the light curve is almost symmetry with respect.
All of our spectra are very similar to each other and also to the one (posted to TNS) taken by R. Leadbeater on 2021-11-04.769. They show the Hβ, and NaID absorption lines and the MgH absorption band. Also, the spectrum by Seimei Telescope shows the Hα, Ca I, and Fe I absorption lines and the CH absorption bands. Such spectra look like that of a late K star. According to ASAS-SN Sky Patrol, this object has dimmed about one magnitude during our observing epoch, but the shape of our spectra is unchanged.
Such evolutions in the light curve and the spectra are consistent that this object is a microlensing event. Taichi Kato reported that this object has shown 0.15-mag flickering, and hence suggests that this object is a posible CV (vsnet-alert 26370 and 26384). However, our spectra and the profile indicate that this object is not a CV. | 2021-11-18 02:41:00 | optical,gravitational lensing,microlensing event,star,transient,variables | 2021-11-18 | 02:41:00 | 1,624 | [
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] | 15,041 |
15,044 | Search for counterpart to IceCube-211117A with ANTARES | Alexis Coleiro (APC/Universite de Paris) and Damien Dornic (CPPM/CNRS) on behalf of the ANTARES Collaboration | Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported gold track event IceCube-211117A (GCN#31093). The reconstructed origin was 11.5 degrees below the horizon for ANTARES at the time of the alert. No muon neutrino candidate events were recorded within 90% error box of the IceCube event during a +/- 1h time-window centered on the IceCube event time, and over which the potential source remained visible. This leads to a preliminary 90% confidence level upper limit on the muon-neutrino fluence from a point source of about 15 GeV.cm^-2 over the energy range 3 TeV â 3.5 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and 43 GeV.cm^-2 (610 GeV - 320 TeV) for an E^-2.5 spectrum. A search over an extended time window of +/- 1 day has also yielded no detection (50% visibility). ANTARES [http://antares.in2p3.fr/] is the largest undersea neutrino detector (Mediterranean Sea) and it is primarily sensitive to astrophysical neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky. | 2021-11-18 16:25:00 | tev,neutrinos,transient | 2021-11-18 | 16:25:00 | 1,230 | [
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] | 15,042 |
15,045 | Optical spectroscopy of the 2021 outburst of recurrent nova M31N 2008-12a | L. S. Sonith, Judhajeet Basu, G. C. Anupama, U. S. Kamath, Pramod Kumar, Mulchand Kurre, Sudhanshu Barway (Indian Institute of Astrophysics, Bengaluru, India | We obtained optical spectra of the recurrent nova M31N 2008-12a during its ongoing outburst (ATel #15034, #15036, #15037, #15038, #15039 and #15040) on 2021-11-14 (JD 2459533.26) and 2020-11-15 (JD 2459534.17) covering a wavelength range of 380-800 nm, using the HFOSC instrument mounted on the 2-m Himalayan Chandra Telescope of the Indian Astronomical Observatory, Hanle. The spectrum obtained on 2020-11-15, shows Hydrogen Balmer lines with FWHM velocity of ~ 3000 km/s for H-alpha and ~ 2400 km/s for H-beta. Lines due to He I (4471, 5876, 6678, 7065) and N III (4638) are also present. The spectra are similar to those of the previous outbursts (e.g. Henze et al. 2018, ApJ, 857, 68; Darnley et al. 2016, ApJ, 833, 149).
We thank the HCT observers for sparing time to carry out the ToO observations. IAO is operated by the Indian Institute of Astrophysics, Bengaluru, India. | 2021-11-18 22:10:00 | optical,nova | 2021-11-18 | 22:10:00 | 880 | [
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] | 15,043 |
15,046 | Blazar 0250-001 with bright VLBI-compact core is a probable neutrino candidate source for IceCube-211116A | Y. Y. Kovalev (ASC Lebedev, MIPT, MPIfR), A. V. Plavin (ASC Lebedev, MIPT), S. V. Troitsky (INR), Yu. A. Kovalev (ASC Lebedev), A. V. Popkov (MIPT, ASC Lebedev) | We have recently shown that VLBI-selected radio-bright AGN are highly probable neutrino associations (Plavin et al., 2020, 2021) with neutrinos being generated within their central parsec-scale region. IceCube collaboration has detected a new neutrino event (IceCube-211116A) of 161 TeV which passed the selection criteria used in our analysis. No Fermi LAT association was reported. The closest radio blazar within the error region to IceCube-211116A neutrino candidate is found to be 0250-001 (J2000.0 positions RA=02:53:21.0354, Dec=+00:05:59.948) at z=1.00. Its archival observations in 2006 with the VLBA at 8 GHz show a very compact structure with an unresolved core of 0.4 Jy and about 100% core dominance. Its RATAN-600 continuum spectrum at centimeter wavelength was slightly rising towards 22 GHz at the level of 0.2-0.3 Jy in October 2019. On the basis of available VLBI catalogs this source is the brightest within the IceCube error region which makes it a highly probable neutrino association. We have triggered monthly RATAN-600 observations of 1-22 GHz continuum spectra and VLBA observations of parsec-scale structure at 15, 24, and 43 GHz of 0250-001. We encourage multi-band observations of the blazar. | 2021-11-19 00:41:00 | radio,tev,neutrinos,agn,blazar,quasar,request for observations | 2021-11-19 | 00:41:00 | 1,220 | [
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] | 15,044 |
15,047 | Spectroscopic classification of transients with the Lick Shane telescope | K. W. Davis, D. O. Jones, M. J. Bustamante-Rosell, M. R. Siebert, R. J. Foley (UCSC) | We report the following classifications from spectroscopic observations with the KAST spectrograph on the Shane telescope obtained on 2021 November 15 UT. The targets were supplied by ATLAS, ALeRCE (selected from the ZTF data stream), and ZTF. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure a Si II velocity of -9,600 km/s. (2) The spectrum has a low signal-to-noise ratio, but is consistent with a SN Ia. (3) Some matches to SN 1991T-like SNe Ia. (4) An marginally resolved H-alpha emission line is detected. We measure a H-alpha FWHM velocity of 700 km/s. Using a Tully-Fisher distance modulus to the host galaxy, NGC 1359, of 32.95 mag (Tully et al., 2009, AJ 138 323) and correcting for Milky Way extinction, the current absolute magnitude is M_r = -14.4 mag and rising. The relatively low absolute magnitude, slow rise (1.7 mag over 6 days), and narrow H-alpha line indicate that AT2021aess is likely not a supernova, but a non-terminal LBV eruption (i.e., a "supernova impostor") or possibly a luminous red nova. | 2021-11-19 05:23:00 | optical,nova,supernovae,transient | 2021-11-19 | 05:23:00 | 1,224 | [
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15,048 | NuSTAR observations of a type-I X-ray burst and preliminary pulse detection identify SAX J1748.9-2021 in outburst | Sean Pike (Caltech), Nobuyuki Kawai (Tokyo Tech), Tatehiro Mihara (RIKEN), Hitoshi Negoro (Nihon U.) | We report on NuSTAR observations of the recent outbursting source MAXI J1749-204 in the globular cluster NGC 6440. The MAXI error circle was consistent with two previously known accreting millisecond pulsars (AMP), SAX J1748.9-2021 and NGC 6440 X-2 (Negoro et al. 2021, Atel #15033). NuSTAR observed the outbursting source on 2021 November 18 (UTC) for a total exposure time of 39 ks. With a position of RA=17:48:52, Dec=-20:21:53 (+/- 45"), the source is coincident with both of the AMPs. The source spectrum is described well by a blackbody with temperature kT_bb=0.46 keV, scattered into a power law with index Gamma=1.8 by a Comptonizing medium with electron temperature kT_e=26 keV. We also included an absorbing column, for which we found a density of nH=6e22 cm^-2. We found a source flux (absorbed, 2-10 keV) of 3.6e-10 erg/cm^2/s. We performed a Z^2_1 search (Buccheri et al. 1983) for pulsations in the frequency ranges 435-455 Hz and 195-215 Hz, corresponding to the known pulse frequencies of SAX J1748.9-2021 (442.36 Hz, Altamirano et al. 2008) and NGC 6440 X-2 (205.89 Hz, Altamirano et al. 2010), respectively. While the most significant signal in the 195-215 Hz range had a 92% false alarm probability (0.1-sigma confidence), we found preliminary evidence for pulsations with frequency 423 Hz at the 2-sigma confidence level. More detailed timing analysis, including orbital corrections and NuSTAR clock corrections are necessary to more accurately determine the significance of this detection as well as the precise frequency of pulsations. We also observed a type-I X-ray burst with a duration of ~100 s. This, in addition to the preliminary pulse detection at 423 Hz, leads us to conclude that the outbursting source MAXI J1749-204 is SAX J1748.9-2021, which has been shown to exhibit type-I bursts. We encourage further observations of the source. | 2021-11-19 13:45:00 | x-ray,globular cluster,neutron star,pulsar,star | 2021-11-19 | 13:45:00 | 1,867 | [
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] | 15,046 |
15,049 | Archival ASKAP observations of the candidate counterpart to IceCube-211116A | Dougal Dobie (Swinburne/OzGrav), David L. Kaplan (UWM), Gregory R. Sivakoff (University of Alberta), Ziteng Wang (University of Sydney), Adam Stewart (University of Sydney), Andrew OâBrien (UWM) | Kovalev et al. (ATel#15046) have recently proposed the blazar 0250-001 as a candidate source of the neutrino event IceCube-211116A (GCN #31091). This Bronze Alert (30-50% astrophysical purity) had an estimated false alarm rate from atmospheric backgrounds of 1.9 events per year.
We have previously observed 0250-001 with the Australian Square Kilometre Array Pathfinder as part of the Variables and Slow Transients pilot survey (Murphy et al. 2021, PASA, 38, e054), with semi-regular monitoring spanning nearly 2.5 years. All observations were carried out with 288 MHz of bandwidth centered on 888 MHz. We report the following flux density measurements:
The corresponding variability metrics are eta=16500, V=0.18, indicating a moderately variable source. There is no evidence for any previous strong outbursts in the lightcurve, although we note that all our observations occurred more than 86 days before the neutrino event. We also note that our last two observations were the brightest flux densities, which could be consistent with neutrino activity that is tied to the time-integrated neutrino flux as opposed to a more impulsive flare. However, given the astrophysical purity of this event and the uncalculated number of potential other sources showing a similar behaviour at radio frequencies, we cannot confidently attribute the recently measured increased flux to the neutrino event.
This work was done as part of the ASKAP Variables and Slow Transients (VAST) collaboration (Murphy et al. 2013, PASA, 30, 6).
The Australian SKA Pathfinder is part of the Australia Telescope National Facility which is managed by CSIRO. Operation of ASKAP is funded by the Australian Government with support from the National Collaborative Research Infrastructure Strategy. ASKAP uses the resources of the Pawsey Supercomputing Centre. Establishment of ASKAP, the Murchison Radio-astronomy Observatory and the Pawsey Supercomputing Centre are initiatives of the Australian Government, with support from the Government of Western Australia and the Science and Industry Endowment Fund. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. | 2021-11-19 17:53:00 | radio,neutrinos,blazar,transient,variables | 2021-11-19 | 17:53:00 | 2,174 | [
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] | 15,047 |
15,050 | Recurrent nova M31N 2008-12a: Swift/XRT detection of the 2021 eruption | M. J. Darnley (LJMU), K. L. Page (Leicester) on behalf of the 12a Collaboration | The discovery of the 2021 eruption of the annually recurring recurrent nova M31N 2008-12a was reported in ATel #15034, with spectroscopic confirmation reported in ATel #15036. Upon discovery, we triggered our pre-approved GI programme on the Neil Gehrels Swift Observatory, reporting the Swift/UVOT uvw2 detection in ATel #15040. Follow-up observations have also been reported in ATels #15037, #15038, #15039, and #15045, with observations on-going at many facilities.
Here we report the emergence of the supersoft X-ray source (SSS) phase of M31N 2008-12a. A faint X-ray counterpart was detected in a 5.6-ks Swift observation between 2021-11-19.064 UT (MJD 59537.064) and 19.277 (MJD 59537.277).
We measured the preliminary XRT count rate to be (3.7 ± 1.2) × 10-3 ct/s. Although this detection is only fractionally above 3σ, there is a clear source in the XRT image at the location of M31N 2008-12a, with all detected X-ray photons below 1.5 keV.
No X-ray source was detected at a significant level in the preceding 1.9-ks Swift observation on 2021-11-18.5 UT with a 3σ upper limit of 4.9 × 10-3 ct/s (nor in any of the previous daily observations since the detection of this eruption).
If we assume an eruption date of 2021-11-14.2 ± 0.2 UT (see ATels #15034 and #15037), then the SSS counterpart appeared around day 5.0 ± 0.2 post-eruption. This preliminary estimate is broadly consistent with the 5.9 ± 0.5 days measured in 2014 (ATel #6558, Henze et al. 2015), the 5.7 ± 0.5 days seen in 2015 (ATel #7984, Darnley et al. 2016), and the 5.8 days observed for the peculiar 2016 eruption (ATel #9872, Henze et al. 2018). However, given the faintness of the detection, this may be the earliest detection yet of SSS emission from this system.
The X-ray spectrum at this time is consistent with SSS emission.
We wish to thank the Swift Team for the excellent scheduling of the observations, in particular the duty scientists, and the science planners. | 2021-11-19 22:08:00 | x-ray,nova,transient | 2021-11-19 | 22:08:00 | 1,956 | [
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] | 15,048 |
15,051 | Observations of BZQ J0253+0006, a possible counterpart to IceCube-211116A, with the Zwicky Transient Facility | Robert Stein (Caltech), Mansi Kasliwal (Caltech), Simeon Reusch (DESY) on behalf of the Zwicky Transient Facility | We report observations of BZQ J0253+0006, reported as a possible counterpart (ATel #15046, #15049) to high-energy neutrino IceCube-211116A (GCN #31085). The Zwicky Transient Facility (ZTF) was undergoing telescope maintenance, and was thus unable to undertake ToO observations of this neutrino as part of our neutrino follow-up program. However, the region has been observed repeatedly as part of routine survey operations, most recently on 2021-11-14.35 UT. These images were processed through the ZTF image reduction pipelines at IPAC (Masci et al. 2019).
The blazar BZQ J0253+0006 has been previously detected by ZTF, with historical periods of flaring activity observed. A full ZTF lightcurve of the source is available at at this link. No flaring activity from source has been seen in recent months, with the most recent detection of r=21.20+/-0.23 on 2021-08-18.47 UT. The source has a quiescent flux comparable to the typical ZTF median limiting magnitude of ~21 in g/r, and thus routine detections are only expected during periods of enhanced electromagnetic activity.
In summary, we find no evidence of recent optical flaring on timescales >2 days, but cannot exclude more rapid variability coincident with the neutrino detection.
ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; DESY, Germany; TANGO, Taiwan; UW Milwaukee, USA; LANL, USA; TCD, Ireland; IN2P3, France. | 2021-11-20 01:55:00 | optical,neutrinos,agn,blazar,transient | 2021-11-20 | 01:55:00 | 1,451 | [
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] | 15,049 |
15,052 | Apparent Outburst of Comet 191P/McNaught | Michael S. P. Kelley (U. Maryland), Tim Lister (Las Cumbres Observatory), Kritti Sharma (IITB), Vishwajeet Swain (IITB), Harsh Kumar (IITB), Varun Bhalerao (IITB), G. C. Anupama (IIA), Sudhanshu Barway (IIA) on behalf of the Zwicky Transient Facility Collaboration, the LCO Outbursting Objects Key Project, and GROWTH India Collaboration | We report an apparent outburst of comet 191P/McNaught, discovered in Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002) data. Photometry of the comet in the r-band (5" radius aperture, PS1 photometric system) was 19.43+/-0.06 mag on 2021 Nov 13 at 10:26 UTC. The comet brightened to r=17.79+/-0.09 mag by the next observation on Nov 18 at 09:26 UTC, resulting in an apparent outburst strength of -1.64+/-0.11 mag in our photometric aperture. The outburst was confirmed in subsequent observations with the 0.7-m GROWTH India Telescope on Nov 18 at 18:52 UTC (r=18.19+/-0.08 mag) and a Las Cumbres Observatory 1-m telescope at the South African Astronomical Observatory on Nov 19 at 01:56 UTC (r=18.12+/-0.11 mag). At the time of the outburst discovery, the comet was 2.77 au from the Sun and 2.10 au from the Earth. The comet's last perihelion passage was 2021 March 20.
Based on observations obtained with the Samuel Oschin Telescope 48-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, Weizmann Institute for Science, Oskar Klein Center at Stockholm University, University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, TANGO Consortium of Taiwan, University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
This work makes use of observations from the Las Cumbres Observatory global telescope network.
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/ | 2021-11-20 05:39:00 | optical,comet,the sun,transient | 2021-11-20 | 05:39:00 | 2,135 | [
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15,053 | Apparent Outburst of Comet 67P/Churyumov-Gerasimenko | Michael S. P. Kelley (U. Maryland), Kritti Sharma (IITB), Vishwajeet Swain (IITB), Harsh Kumar (IITB), Varun Bhalerao (IITB), G. C. Anupama (IIA), Sudhanshu Barway (IIA), Daniel Gardener (U. Edinburgh), Tim Lister (Las Cumbres Observatory), Helen Usher (Open University), Tony Angel (Harlingten Observatory) on behalf of the Zwicky Transient Facility Collaboration, GROWTH India Collaboration and the LCO Outbursting Objects Key Project | We report an apparent outburst of comet 67P/Churyumov-Gerasimenko, discovered in Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002) and GROWTH-India Telescope (GIT) data. Photometry of the comet in the r-band (5" radius aperture, PS1 photometric system) was 12.06+/-0.02 and 12.16+/-0.02 mag on 2021 Nov 14 at 10:57 and Nov 16 at 20:23 UTC, respectively. The comet brightened to r=11.52+/-0.08 mag by the next observation on Nov 17 at 20:44 UTC, resulting in an apparent outburst strength of -0.64+/-0.08 mag in our photometric aperture. The event is confirmed in subsequent ZTF photometry, r= 11.66+/-0.03 and 11.70+/-0.03 on Nov 18 at 09:25 and 11:38 UTC, respectively and from the Las Cumbres Observatory (LCO) 2m Faulkes Telescope North (FTN)+MuSCAT3 four channel imager on Nov 18 11:20 UTC. The FTN photometry measured through the same 5â radius aperture is g=12.33+/-0.02, r=11.67+/-0.02, i=11.47+/-0.02 and z=11.39+/-0.04 mag. At the time of the outburst discovery with ZTF, the comet was 1.23 au from the Sun and 0.42 au from the Earth. The cometâs last perihelion passage was on 2021 Nov 2.
Based on observations obtained with the Samuel Oschin Telescope 48-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, Weizmann Institute for Science, Oskar Klein Center at Stockholm University, University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, TANGO Consortium of Taiwan, University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
This work makes use of observations from the Las Cumbres Observatory global telescope network. Based on observations made with the MuSCAT3 instrument, developed by the Astrobiology Center and under financial supports by JSPS KAKENHI (JP18H05439) and JST PRESTO (JPMJPR1775), at Faulkes Telescope North on Maui, HI, operated by the Las Cumbres Observatory. The FTN observations were obtained as part of the Comet Chasers school outreach program, by Tony Angel. The Comet Chasers program is part of the Faulkes Telescope Project (FTPEPO2014A-004), which is partly funded by the Dill Faulkes Educational Trust.
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/ | 2021-11-20 05:46:00 | optical,comet,the sun,transient | 2021-11-20 | 05:46:00 | 2,882 | [
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] | 15,051 |
15,054 | SXP 15.6: New outburst detection by S-CUBED, with NICER and SALT followup | M. J. Coe (Southampton), P. A. Evans (Leicester), J. A. Kennea (PSU), Keith Gendreau, Zaven Arzoumanian (NASA/GSFC), Elizabeth Ferrara (NASA/GSFC/UMD), David Buckley (SAAO), Itumeleng Monageng (UCT/SAAO) | We report on the detection, by S-CUBED, of an outburst of the SMC Be/XRB SXP 15.6, AKA XMM J004855.5-734946 (ATEL #9197, #9229). S-CUBED is a weekly survey of the optical extent of the SMC with the Swift X-ray and UV/Optical Telescopes (Kennea et al., 2018). On November 9th, 2021 observation, SXP 15.6 was found to be at an XRT count rate of 0.43 +/- 0.10 count/s. The following week on Nov 16th observation, S-CUBED detected the source at a rate of 0.45 +/-0.15 count/s. In S-CUBED monitoring, which began June 2016, SXP 15.6 had never been detected at a brightness above 0.25 count/s, making this a significant outburst.
We requested and obtained a 4ks Swift Target-of-opportunity observation. Observations began at 15:44UT on Nov 19, 2021. Analysis of the XRT data finds the source at an average count rate of 0.70 +/- 0.03 count/s. The spectrum is well fit by a power-law model with a photon index = 0.88 +/- 0.10, with a N_H fixed at the SMC value of 6x10^20 cm^-2. The measured flux is 4.5 x 10^-11 erg/s (0.3-10 keV), which is equivalent to a luminosity of 2 x 10^37 erg/s (0.3 - 10 keV) assuming a SMC distance of 62 kpc.
We also requested a NICER TOO for SXP 15.6, and beginning 02:04UT on Nov 20, 2021, a 7.3ks observation was taken. Analysis of the NICER observation reveals the presence of a significant detection of a pulsar period at 15.64034s. This pulsar period is also weakly detected in the Swift/XRT data. We note that this pulsar period is the same as that reported in 2016 observations by Vasilopoulos et al (2016), suggesting no strong evolution of the spin period in the last 5 years.
Further NICER observations have been requested in order to monitor the flux and pulsar period evolution during this new outburst. Due to spacecraft constraints Swift monitoring will not be possible for the near future.
In addition we observed the optical counterpart of SXP 15.6 on Nov 19, 2021 at 19:51:45 UT with the Southern African Large Telescope (SALT) under the SALT transient follow-up programme (2021-2-LSP-001). The Robert Stobie Spectrograph was used with a PG2300 grating at an exposure time of 1200 secs covering the wavelength range 6090 - 6920 AA at a resolution of 1.5A. The H-alpha line is seen strongly in emission with a single peak morphology plus a hint of a red shoulder. The measured equivalent width was -8.2 +/- 0.3 Angstrom. This is compared to a historical measurement in December 2011 from ESO/NTT of -5.2 +/- 0.2 Angstrom. Further observations are scheduled with SALT to trace the evolution of the H-alpha emission line. | 2021-11-22 03:38:00 | optical,x-ray,binary,neutron star,pulsar,star,transient | 2021-11-22 | 03:38:00 | 2,562 | [
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] | 15,052 |
15,055 | Swift XRT/UVOT rapid follow-up of bright FRB 20211122A | Aaron Tohuvavohu (U Toronto), Jamie Kennea (PSU), Phil Evans (U Leicester), James DeLaunay (U Alabama) | The Neil Gehrels Swift Observatory responded with its newly commissioned AutoToO autonomous repoint mode, to rapidly observe the bright CHIME FRB 20211122A (event #198595370 T0: 2021-11-22T05:42:17.806940), slewing and landing on target at T0+39 minutes. The XRT and UVOT fields of view fully cover the 90% localization region (radius 3.5') reported by CHIME/FRB. Observations continued for 2000 s of integrated exposure, with XRT taking data in Photon Counting (PC) mode and UVOT observing in event mode (11 ms timing) with the u filter. No new or outbursting sources are found in the FRB's localization region, down to an average 3 sigma upper limit of 5e-3 ct s-1 (0.3-10 keV) and 21.3 AB mag in the u filter. This research has made use of the CHIME/FRB VOEvent Service. | 2021-11-23 01:31:00 | radio,optical,ultra-violet,x-ray,fast radio burst,transient | 2021-11-23 | 01:31:00 | 773 | [
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] | 15,053 |
15,056 | Optical outburst of Aql X-1 detected by Murikabushi telescope | M. Niwano, R. Hosokawa, N. Kawai (TokyoTech), T. Horiuchi, H. Hanayama (NAOJ) report on behalf of the MITSuME collaboration | We monitor the recurrent neutron star low-mass X-ray binary Aql X-1 = V1333 Aql in optical wavelength. The last outburst in optical and X-ray of Aql X-1 was reported in Mar 2021 (Atel #14437, #14563, H.Negoro & K.Seino, X-ray-star:806). On Nov 17, a new X-ray outburst was reported in the public mailing list (Komachi, X-ray-star:845). Here we report an optical brightening of this object by the optical three color (g', Rc, and Ic) CCD cameras attached to the 105 cm Murikabushi telescope of Ishigakijima Astronomical Observatory, Okinawa, Japan. We obtained the preliminary magnitudes of Aql X-1 as follows: g'=18.14+/-0.06, Rc=17.43+/-0.03, Ic=16.90+/-0.08 on 2021-11-17 (MJD 59535.43), g'=18.27+/-0.05, Rc=17.45+/-0.02, Ic=16.96+/-0.07 on 2021-11-18 (MJD 59536.44), g'=17.96+/-0.04, Rc=17.25+/-0.02, Ic=16.77+/-0.08 on 2021-11-20 (MJD 59538.44), and g'=17.83+/-0.05, Rc=17.14+/-0.02, Ic=16.72+/-0.07 on 2021-11-21 (MJD 59539.45). We used PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed by the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, 73, 1, 4-24; https://github.com/MNiwano/Eclaire). We will continue simultaneous multi-color observation with the MITSuME telescope. Multiwavelength follow-up observations are encouraged. | 2021-11-23 13:34:00 | optical,x-ray,binary,neutron star,star,transient | 2021-11-23 | 13:34:00 | 1,300 | [
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] | 15,054 |
15,057 | Fermi-LAT detection of renewed gamma-ray activity from PKS 0903-57 | Stefano Ciprini (INFN Roma Tor Vergata, & ASI Space Science Data Center, Rome, Italy), on behalf of the the Fermi Large Area Telescope Collaboration | The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed enhanced gamma-ray flaring activity from a source positionally consistent with the blazar PKS 0903-57, also known as 4FGL J0904.9-5734 (Abdollahi et al. 2020, ApJS, 247, 33), with coordinates R.A. = 136.2215792 deg, Dec. = -57.5849397 deg (J2000; Fey et al. 2004, AJ, 128, 2593), and a tentative redshift z=0.695 (Thompson et al. 1990, PASP, 102, 1235).
Preliminary analysis indicates that this source was in a very bright gamma-ray emission state on 2021 November 19 and 20, with the emission of several E>15 GeV-energy photons, in particular a 56 GeV photon (at time: 2021 November 19, 20:41:37 UTC) and a 51 GeV photon (at time: 2021 November 20, 09:16:01 UTC), and with daily averaged gamma-ray fluxes (E>100MeV) of (2.0+/-0.2) X 10^-6 photons cm^-2 s^-1 and (3.1+/-0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only), respectively. The corresponding photon index on both days is 1.7+/-0.1, significantly smaller than the 4FGL value of 2.30+/-0.03. The peak 6-hour integrated gamma-ray flux (E>100 MeV) of (4.6+/-0.6) X 10^-6 photons cm^-2 s^-1 was reached in the interval 06:00-12:00 UT of November 20, with a corresponding photon index of 1.7+/-0.1. This flux level corresponds to an increase of a factor of about 70 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL). This is a renewed outburst activity for PKS 0903-57 continuing since late October 2021.
This is the fifth time that the Fermi-LAT Collaboration has announced an intense GeV gamma-ray flare from PKS 0903-57 (ATel#13604, ATel#13599, ATel#11644, ATel#7704), and after them gamma-ray detection by DAMPE (ATel#13643), H.E.S.S. (ATel#13632), and AGILE (ATel#13602). This source is included in the "LAT Monitored Sources" list and consequently, a preliminary estimation of the daily gamma-ray flux observed by Fermi-LAT is publicly available (https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/PKS_0903-57). Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Isabella Mereu (mereuisabella@gmail.com).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. | 2021-11-23 14:01:00 | gamma ray,agn,blazar | 2021-11-23 | 14:01:00 | 2,580 | [
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] | 15,055 |
15,058 | Swift follow-up of the flaring blazar PKS 0903-57 | I. Mereu (INFN Perugia) and F. D'Ammando (INAF-IRA Bologna) | Following the flaring gamma-ray activity of the blazar PKS 0903-57 (ATel #15057), we performed Swift target of opportunity observations on 2021 November 12, 15, and 18.
Swift/XRT data were taken in Photon Counting mode for a total exposure of 2.4 ksec, 2.4 ksec, and 2.6 ksec on 2021 November 12, 15, and 18, respectively. Taking into consideration the Swift/XRT observations performed during 2018-2021, the source reached on 2021 November 18 one of the highest count rate observed so far in the 0.3-10 keV energy (see Swift-XRT Monitoring of Fermi-LAT Sources of Interest ). The X-ray spectrum (0.3-10 keV) can be fit by an absorbed power law model with a HI column density consistent with the Galactic value in the direction of the source (n_H = 2.6x10^21 cm^-2, Ben Bekhti et al., 2016, A&A, 594, A116) and a photon index of 1.17 +/- 0.18, 1.52 +/- 0.18, and 1.59 +/- 0.15 on 2021 November 12, 15, and 18, respectively. The corresponding observed 0.3-10 keV fluxes are (7.3 +/- 0.7)e-12, (5.5 +/- 0.6)e-12, and (8.1 +/- 0.7)e-12 erg cm^-2 s^-1, respectively. As a comparison, the X-ray spectrum of the source collected on 2021 August 8 and 11 is fitted with an absorbed power-law with a photon index of 1.58 +/- 0.28 and 1.30 +/- 0.25, respectively. The corresponding observed 0.3-10 keV fluxes on 2021 August 8 and 11 are (4.1 +/- 0.7)e-12 and (4.2 +/- 0.5)e-12 erg cm^-2 s^-1, respectively. This confirms the increase of the X-ray activity of PKS 0903-57 during 2021 November.
Simultaneous Swift/UVOT observations were performed. The measured magnitudes are: w1 = 16.12 +/- 0.08 and m2 = 16.89 +/- 0.07 on 2021 November 12; w2 = 16.31 +/- 0.06 on November 15; u = 15.11 +/- 0.05 on November 18. As a comparison, the measured magnitudes observed on 2021 August 8 and 11 are m2 = 17.37 +/- 0.08 and w2 = 17.70 +/- 0.07, respectively, indicating an increase of activity also in UV during 2021 November.
In consideration of the ongoing activity of this source, confirmed also by the Swift observations, we strongly encourage further multi-wavelength observations.
We would like to thank the Swift Team, the Swift ODS, and the PI for making these observations possible. | 2021-11-23 19:35:00 | optical,ultra-violet,x-ray,gamma ray,agn,black hole,blazar | 2021-11-23 | 19:35:00 | 2,173 | [
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15,059 | The Onset of X-Ray Flare in the TeV-Detected Blazar Markarian 501 | Bidzina Kapanadze (Ilia State University, Tbilisi, Gerogia; E. Kharadze National Astrophysical Observatory, Abastumani, Georgia) | The TeV-detected blazar Markarian 501 (z=0.034) is a bright X-ray source and prominent with very strong TeV/X-ray flares (see, e.g., Ahnen et al., 2017, A & A, 603, 31; Kapanadze et al. 2017, MNRAS, 469; 1655). Consequently, this object represents one of the frequent targets of X-Ray Telescope onboard Neil Gehrels Swift Observatory (Swift-XRT; 810 observations with 851 ks of the total exposure time since 2005 February 25). Apparently, the source has undergone a nearly decade-long variations in the baseline X-ray level, and since 2021 March, we observe a significantly enhanced X-ray activity of the source compared to the previous years (and comparable to the flaring behaviour shown in 2014 March-October; see https://www.swift.psu.edu/monitorin g/source.php?source=Mrk501 and Kapanadze B. et al. 2017), superimposed by shorter-term X-ray flares. Currently, Mrk 501 is observed with Swift-XRT in the framework of out Target of Opportunity (TOO) request Number #16518. After a drop by a factor of ~2.5 in the 0.3-10 keV brightness to 4.61+/-0.09 cts/s (on November 10), the source showing a gradual brightening by ~50% during the XRT pointing performed on November 22. In the framework of one-zone SSC models, a flaring activity of Mrk 501 is also expected in the UV-radio and gamma-ray parts of the spectrum, and intensive multiwavelength observations of the source are strongly encouraged for discerning the underlying emission mechanisms and instable processes. XRT is one of the Swift instruments along with Burst Alert Telescope (BAT) and UV/Optical Telescope (UVOT). It is a JET-X Wolter I type telescope, developed jointly by Pennsylvania State University, Brera Astronomical Observatory (OAB) and University of Leicester. Thanks to the unique characteristics, good photon statistics and low background counts of this instrument (in combination with EEV CCD2 detector), we can investigate a flux variability on different time-scales from minutes to years, obtain high-quality spectra for the majority of the observations, derive different spectral parameters, and study their timing behaviour in the 0.3-10 keV range of the electromagnetic spectrum. The Swift Satellite is operated by Pennsylvania State University. | 2021-11-24 05:36:00 | radio,optical,x-ray,gamma ray,tev,agn,blazar | 2021-11-24 | 05:36:00 | 2,228 | [
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15,060 | Search for counterpart to HAWC-211123A with ANTARES | Alexis Coleiro (APC/Universite de Paris) and Damien Dornic (CPPM/CNRS) on behalf of the ANTARES Collaboration. | Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported HAWC-211123A alert (event 110400_42 [https://gcn.gsfc.nasa.gov/notices_amon_hawc/110400_42.amon]). No up-going muon neutrino candidate events were detected within the error box of the HAWC event during a +/- 1h time-window centered on the HAWC event time (T0), and over which the potential source remained visible 88% of the time in the up-going field of view of ANTARES. At T0, the elevation of the alert was -7.3 degrees below the horizon for ANTARES. This leads to a preliminary 90% confidence level upper limit on the muon-neutrino radiant fluence from a point source of about 17 GeV.cm^-2 over the energy range 3 TeV â 3 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and about 70 GeV.cm^-2 (0.5 - 280 TeV) for an E^-2.5 spectrum. A search over an extended time window of +/-1 day has also yielded no detection (54% visibility). ANTARES [http://antares.in2p3.fr/] is the largest undersea neutrino detector (Mediterranean Sea) and it is primarily sensitive to astrophysical neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky. | 2021-11-24 17:28:00 | tev,neutrinos,transient | 2021-11-24 | 17:28:00 | 1,339 | [
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] | 15,058 |
15,061 | Rapid spectral change in the symbiotic binary V694 Mon (MWC 560) | V. P. Goranskij (SAI, Moscow Univ. & SAO RAS), A. V. Zharova (SAI, Moscow Univ.), E. A. Barsukova, A. N. Burenkov (SAO RAS) | V694 Mon was a symbiotic binary forming high-velocity jets, showing high-amplitude flickering, and regular outbursts with the period of 1930 days. Munari et al. (2016, New Astronomy V.49, 43) discovered periodic 331 day variations in the Ic band where the radiation of the M giant dominates. In November 2018, the star had the outburst, which did not match the predicted time. At the outburst, the jets disappeared, and flickering stopped until recently (ATel #12227, #14239, #14988). We continue photometric and spectroscopic observations, which show gradual brightening of the system and weakening of the emission lines in the spectrum. The burst predicted with the period of 1930 days should have happened in summer 2021 during the invisibility of the system due to conjunction with the Sun, but this burst did not take place. However, in the middle of October, we recorded the brightness jump by 0.3 mag in all filters. Then the star has broken the record of its brightness in optical bands again. We obtained the spectrum on 2021 October 22.112 UT with the 1 m Zeiss telescope and UAGS spectrograph within the range of 5760-7160 A, the resolution was 2.3 A. The spectrum showed strong absorptions of Si II 6347 and 6371 A characteristic of A type stars, and deep Na I 5891, 5896 A lines. H alpha emission was strong with the narrow absorption component. There were a few weak emissions associated with the Fe II ions. The blue spectrum taken on 2021 November 22.037 UT with the same telescope and device in the range of 3931-5340 A with the resolution of 1.7 A is full absorption spectrum with deep hydrogen absorptions typical of early subtype A stars and multiple Fe II lines now in absorption. We treat the described phenomenon as the transit of the system from the disk accretion to the common envelope configuration with filling the Roche lobe of compact companion. Here, the M giant, the donor star is accreting in the dynamical mode (predicted by Philipp Podsiadlowski). Now, the gainer of accretion material has formed a photosphere like that one of early subtype A star, which cannot excite the surrounding gas shell. | 2021-11-24 23:53:00 | optical,binary,star,the sun,variables | 2021-11-24 | 23:53:00 | 2,131 | [
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] | 15,059 |
15,062 | Optical follow-up of Mrk 501 | Roberto Nesci (INAF/IAPS) | Following the detection of an X-ray flare of Mrk 501 reported in ATel #15059, I observed the source in the R(Cousins) band with the 30cm telescope of the Foligno Observatory (K56) on 2021-11-24T16:44. Comparison stars were taken from Gonzales-Peres et al (2001, AJ 122, 2055), as used by the Tuorla team in their monitoring of this object (e.g. Nilsson et al., 2018, A&A, 620, 185). Aperture photometry was done with IRAF/apphot using a 4" radius. The core of Mrk 501 gave a magnitude R=13.35 +- 0.07. This is fainter than the last public observation of the Tuorla team (R=13.1 on 2021-10-21). The host galaxy gives an appreciable contribution to the observed flux, so it is not easy to compare data taken with different instruments and seeing conditions, however it is apparent that the X-ray flare produced no significant luminosity increase in the R band. | 2021-11-25 07:21:00 | optical,x-ray,star | 2021-11-25 | 07:21:00 | 858 | [
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] | 15,060 |
15,063 | LJT spectroscopic classification of AT 2021aexy as a relatively young Type Ia supernova | Liping Li (Yunnan University), Jujia Zhang, Qian Zhai (YNAO), Xiaofeng Wang(THU) | We report an optical spectrum of AT 2021aexy (350-890nm) that was obtained on 2021 Nov. 24.67 UT with the Lijiang 2.4-m telescope (LJT +YFOSC) at LiJiang observatory of Yunnan Observatories. The spectrum is similar to that of a type Ia supernovae at a few days before the maximum light. Cross-correlation with the library of supernova spectra using the comparison tool Gelato (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024) shows that it matches with SN 2003du at t = -3 to -7 days. Given a redshift of 0.039 for the host galaxy derived by SNID, an expansion velocity of about 9500 km/s can be deduced from the Si II 635.5 absorption minimum. | 2021-11-25 15:17:00 | optical,supernovae | 2021-11-25 | 15:17:00 | 685 | [
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] | 15,061 |
15,064 | Spectroscopic Classifications of Optical Transients with the Lick Shane telescope | K. Taggart, R. J. Foley (UCSC) | We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. The targets were supplied by the Pan-STARRS Survey for Transients, The Young Supernova Experiment, and ZTF. All observations were made on 2021 Nov 25 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure a H-alpha absorption velocity of -7,900 km/s. (2) The spectrum appears to be heavily reddened. Additional observations would be useful to further classify. (3) We measure a H-alpha absorption velocity of -15,700 km/s. (4) We measure a Si II 6355 velocity of -12,000 km/s. | 2021-11-26 03:06:00 | optical,supernovae,transient | 2021-11-26 | 03:06:00 | 819 | [
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] | 15,062 |
15,065 | Search for counterpart to IceCube-211125A with ANTARES | Alexis Coleiro (APC/Universite de Paris) and Damien Dornic (CPPM/CNRS) on behalf of the ANTARES Collaboration. | Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported bronze track event IceCube-211125A (GCN #31126). The reconstructed origin was 6 degrees below the horizon for ANTARES at the time of the alert. No muon neutrino candidate events were recorded within 90% error box of the IceCube event during a +/- 1h time-window centered on the IceCube event time, and over which the potential source remained visible 82.5% of the time window. This leads to a preliminary 90% confidence level upper limit on the muon-neutrino radiant fluence from a point source of about 12 GeV.cm^-2 over the energy range 5 TeV â 5 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and 35 GeV.cm^-2 (1 - 500 TeV) for an E^-2.5 spectrum. A search over an extended time window of +/- 1 day has also yielded no detection (37% visibility). ANTARES [http://antares.in2p3.fr/] is the largest undersea neutrino detector (Mediterranean Sea) and it is primarily sensitive to astrophysical neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky. | 2021-11-26 17:58:00 | tev,neutrinos,transient | 2021-11-26 | 17:58:00 | 1,255 | [
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] | 15,063 |
15,066 | Stringent limits to the absence of flickering in V694 Mon = MWC 560 that is passing through record brightness | U. Munari (INAF Padova) and S. Dallaporta (ANS Collaboration) | The symbiotic binary V694 Mon raised from obscurity to headlines in 1990 when it went into outburst and its spectra showed the daily launching of discrete blobs of optically thick material up to record velocities of 6,000 km/s (Tomov 1990, Nature 346, 637). The reckless spectroscopic variability that followed was always paralleled by large-amplitude photometric flickering. V694 Mon never returned to quiescence and entered instead a continued increase in brightness modulated by various periodicities (Munari et al. 2016, NewA 49, 43), primarily 331 and 1860 days, and a possible 9570 days. The flickering stopped during the rise of V694 Mon to the 2016 peak brightness, but soon reappeared as the object begun declining.
The V694 Mon that in 2018 emerged from solar conjunction was radically different from that observed during the previous three decades: persistent disappearance of flickering (Goranskij et al. 2018, ATel #12227; Zamanov et al. 2020, ATel #14239; Zamanov et al. 2021, ATel #14988) and a monotonic increase in brightness, continuing ever since and defying all previously observed periodicities.
Goranskij et al. (2021, ATel #15061) have recently called attention to the near disappearance of emission lines when they resumed spectroscopic observation of V694 Mon after the 2021 solar conjunction. As part of ANS Collaboration continued monitoring, we too resume photometric observations of V694 Mon as soon the object returned visible in the pre-dawn sky, and obtained the results listed in the table: they indicate a very smooth and constant-colors passage through peak brightness reached around Oct 27, 2021, which marks also a record for this star.
Searches for flickering in recent years have placed a limit of about 0.05 mag to its presence (ATel #12227, #14239, #14988). We have observed V694 Mon on 2021 Nov 25 with ANS Collaboration telescope ID 0310 to set more stringent limits to the presence of any flickering. We observed in Landolt's B and V bands, continuously flipping between the two for an hour and forty minutes between UT 1.23 and UT 3.02. The search for flickering was carried out in the B-band data, while V-band observations served primarily to solve the color equations to perform transformation from the instantaneous local photometric system to the standard Landolt one, adopting the local photometric sequence calibrated by Henden and Munari (2001, A&A 372, 145). The 60 B-band measurements (each lasting 30sec) distribute in a fine Gaussian shape around the mean B=8.787 mag value, with a sigma of 0.0067 mag. Considering that observational errors are contributing their share to such sigma, we may confidently conclude that if any flickering was present during the time interval of our observations, its amplitude does not exceed 0.005 mag. | 2021-11-27 23:26:00 | optical,binary,cataclysmic variable,star,variables | 2021-11-27 | 23:26:00 | 2,794 | [
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] | 15,064 |
15,067 | MASTER OT J030227.28+191754.5 - 10 mag outburst detection during an inspect of IceCube-211125A | #15032; K. Zhirkov, Ya. Kechin, V. Lipunov, E. Gorbovskoy, P. Balanutsa, A. Kuznetsov, O. Gress, G. Antipov, D. Vlasenko, N. Tiurina, D. Zimnukhov, V. Senik, V. Topolev, A. Chasovnikov, E. Minkina, V. Grinshpun, D. Cheryasov, Ya. Kechin, T. Pogrosheva, V. Shumkov (Lomonosov MSU), R. Rebolo, M. Serra(IAC), D. A. H. Buckley (SAAO), N. M. Budnev (ISU, API), R. Podesta, C. Lopez, F. Podesta, C. Francile (OAFA), A. Tlatov, D. Dormidontov (KSS, Pulkovo observatory), A. Gabovich, V. Yurkov (BSPU) | MASTER OT J030227.28+191754.5 - Discovery of a 10 mag outburst during an inspect of IceCube-211125A
MASTER-Tavrida auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source during follow-up observations of IceCube-211125A at (RA, Dec) = 03h 02m 27.28s +19d 17m 54.5s on 2021-11-26.82568 UT. The OT unfiltered magnitude at the time was 15.1m (mlim=17.0). Consequent observations made by MASTER-OAFA 5 hours later revealed a significant brightening to 13.4m, and to 11.7 by MASTER-Kislovodsk at 2021-11-27 16:54:17UT. This prompted us to start follow-up observations at MASTER-Kislovodsk at 2021-11-27 16:54:17 UT. At this point OT brightened to 11.7m. The OT is coincident with a GALEX UV source (Bianchi, L. et al, Astrophys Space Sci 335, 161â169 (2011)) and a star of g= 21.95+/-0.08(Shadab Alam et al 2015 ApJS 219 12) We have reference image on 2020-09-14.03469 UT with unfiltered mlim=19.9m. Follow-up and spectral observations are required. | 2021-11-28 05:31:00 | optical,vhe,neutrinos,cataclysmic variable,star,supernovae,transient,variables,request for observations | 2021-11-28 | 05:31:00 | 1,016 | [
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] | 15,065 |
15,068 | Optical Photometric Observations of M31N 2008-12a: Pre- and post-maximum of the 2021 eruption | H. Naito (Nayoro Observatory), S. Kiyota (VSOLJ), Y. Sano (VSOLJ), K. Taguchi (Kyoto University), H. Maehara (NAOJ), A. Arai (NAOJ), K. Itagaki (Itagaki Observatory), M. Kato (Keio University), K. Matsumoto (Osaka Kyoiku University), K. Nishiyama, F. Kabashima (Miyaki-Argenteus Observatory), A. Tajitsu (NAOJ), S. Takagi (Hokkaido University), F. Watanabe (Nayoro Observatory), for a larger collaboration | We report additional multicolor photometry of the 2021 eruption of the remarkable recurrent nova M31N 2008-12a (ATels #15034, #15036, #15037, #15038, #15039, #15040, #15045, #15050, see Darnley et al. 2014, 2015, 2016 and Henze et al. 2014, 2015a, 2015b, 2018 for comprehensive multi-wavelength light curves of previous eruptions). The magnitudes and upper limits for the nova are given in the table below. | 2021-11-28 17:34:00 | optical,nova | 2021-11-28 | 17:34:00 | 406 | [
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] | 15,066 |
15,069 | Classification of AT2021afpi, a possible counterpart to IC211125A, as a classical nova | Robert Stein (Caltech), Viraj Karambelkar (Caltech), Mansi M. Kasliwal (Caltech), Yashvi Sharma (Caltech), Kishalay De (MIT), Anna Franckowiak (RUB) | AT2021afpi was a bright optical transient discovered by MASTER (ATEL #15067), and reported by them as a possible electromagnetic counterpart to high-energy neutrino IceCube-211125A (GCN #31126). We obtained a spectrum of AT2021afpi at 2021-11-28.203 UT with the IFU spectrograph SED machine on the 60-inch telescope at Palomar Observatory (Blagoradnova et al. 2018, Rigault et al. 2019).
The spectrum shows a hot blue continuum with strong Balmer lines at an apparent redshift of zero, confirming a galactic origin for AT2021afpi. It also exhibits HeI and HeII emission lines. The spectrum resembles that of V2860 Ori, a classical nova of subclass He/N (De et al. 2021). Given this, and the rapid 10 magnitude brightening, AT2021afpi is likely a young He nova.
Classical novae have been confirmed as gamma-ray sources (e.g Ackermann et al. 2014), with modelling suggesting that this emission may have a possible hadronic origin. Novae are thus considered possible neutrino sources (e.g Fang et al. 2020). However, we note that the accompanying neutrino emission has previously been mostly predicted to occur at GeV-TeV energies, while the neutrino IC211125A was reported with a higher estimated energy of 117 TeV.
Gamma-ray observations of this source, in particular measurements of any spectral cutoff, could help to constrain neutrino emission scenarios.
Our spectrum is also viewable on the Transient Name Server.
The SED Machine is based upon work supported by the National Science Foundation under Grant No. 1106171. | 2021-11-29 08:00:00 | optical,gamma ray,tev,neutrinos,nova,transient | 2021-11-29 | 08:00:00 | 1,526 | [
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15,070 | LJT Spectroscopic classification of AT 2021afkk as a young type II supernova with flash-ionized signatures | Jujia Zhang, Qian Zhai (YNAO), Xiaofeng Wang(THU) | We obtained an optical spectrum (range 350-870 nm) of AT 2021afkk with the Li-Jiang 2.4 m telescope (LJT+YFOSC) at the Li-Jiang Observatory Yunnan Observatories. The spectrum characterized by a blue continuum and prominent narrow emission lines (so-called flash-ionized signatures) matches the young type II supernova with CSM interaction. Cross-correlation with a library of supernova spectra using SNID (Blondin and Tonry 2007, Ap.J., 666, 1024) shows that it matches SN 1998S at t = -13 days. | 2021-11-29 09:11:00 | optical,supernovae | 2021-11-29 | 09:11:00 | 495 | [
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] | 15,068 |
15,071 | MAXI/GSC detection of a new long X-ray burst from 4U 1820-30 | M. Serino (AGU), W. Iwakiri (Chuo U.), H. Negoro, M. Nakajima, K. Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, K. Komachi, H. Hiramatsu, A. Yoshida (AGU), Y. Tsuboi, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, M. Niwano, R. Hosokawa, Y. Imai, N. Ito, Y. Takamatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka, M. Kurihara (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, Y. Goto, R. Uematsu, K. Inaba (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, Y. Nonaka, T. Sato, R. Hatsuda, R. Fukuoka (Miyazaki U.), T. Kawamuro (UDP/NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC) | MAXI/GSC detected a bright X-ray burst from the position consistent with that of the low-mass X-ray binary 4U 1820-30 at 23:24 UT on 2021 November 25. The 4-10 keV X-ray flux averaged over the scan transit assuming a constant flux was 1137 (-68, +70) mCrab (1 sigma error). In the next scan transit at 00:57 on November 26, the source flux was 385 (-86, +41) mCrab in the same energy band. There was no significant excess flux in the previous transit at 21:51 UT. Because a burst like profile was not seen during the scan transit at 23:24, the burst had already started before the scan transit. Assuming that the persistent emission did not change during the burst, we extracted the spectrum from 3 consecutive scans just before the burst as the persistent emission and included it in the fitting of the burst spectrum extracted from each scan. The persistent flux derived from the spectrum was 264 (-24, +15) mCrab in 4-10 keV. The absorbed blackbody model fit to the spectra of the first and the second scan transits in the 2-20 keV band gives the blackbody temperature of 2.0 (+0.2, -0.2) keV and 0.8 (+0.6, -0.4) keV, respectively. Here, the hydrogen column density was fixed at 2.7 × 1021 cm-2 (Krim et al. 2009, ATel #2071). Assuming source distance of 7.6 kpc (Kuulkers et al. 2003), the bolometric source luminosity at the first scan was 1.3 (+0.2, -0.2) × 1038 erg/s, which was 34% of empirical Eddington limit for a He type-I X-ray burst (3.8 × 1038 erg/s; Kuulkers et al. 2003). The e-folding decay time calculated from the fluxes of the two scans was 1.1 (+0.5, -0.4) hour. The preceding long X-ray burst with the similar duration from this source was reported in August this year (ATel #14871). | 2021-11-29 12:02:00 | x-ray,binary,neutron star,star | 2021-11-29 | 12:02:00 | 1,707 | [
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] | 15,069 |
15,072 | Spectroscopic and Photometric follow-up of MASTER OT J030227.28+191754.5: a Possible "Narrow-lined He Nova" or Large-amplitude Dwarf Nova | Kenta Taguchi, Masaaki Shibata, Yamanaka Masayuki, Keisuke Isogai, Yusuke Tampo, Naoto Kojiguchi, Junpei Ito, Taichi Kato (Kyoto University) | We report our spectra of MASTER OT J030227.28+191754.5 (#15067, #15069) = AT 2021afpi = PNV J03022732+1917552, which was reported as a possible counterpart to IceCube-211125A (GCN #31126). We obtained a low-resolution (R ∼ 500) spectrum from 2021-11-28.5323 UT to 2021-11-28.5362 UT using the fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019) mounted on the 3.8 m Seimei telescope (Kurita et al. 2020) at Okayama Observatory of Kyoto University.
As reported to Atel #15067, this object was discovered by MASTER-Tavrida auto-detection system at 15.1 mag (unfiltered) on 2021-11-26.82568 UT. As is reported to CBAT, it was also independently discovered by Yuji Nakamura at 11.7 mag (unfiltered) on 2021-11-28.4689. According to consequent observations by MASTER-Kislovodsk, this object brightened to 11.7 mag on 2021-11-27.70436 UT. There are no past such outbursts recorded in the ASAS-SN light curve.
Our spectra confirm the result of #16069. They are dominated by a blue continuum. The Balmer lines (Hα, Hβ, Hγ, and Hδ), the He I lines(4388, 4471, 4713, 4922, 5016, 5048, 5876, 6678, 7066, 7281 Å), the He II lines (4542, 4686, 5412 Å), the Bowen blend, and the O I line (7773 Å) are detected. All lines above show single-peaked emission profiles. We also performed moderately high resolution (R ∼ 2000) spectroscopy using KOOLS-IFU from 2021-11-28.5392 to 2021-11-28.5503 and confirmed that the Hα line has a single-peaked emission profile whose FWHM is ∼ 10 Å (∼ 500 km/s). Such a narrow emission line profile is unusual for a nova. We also performed time-series photometry using the 40 cm-telescope at Kyoto University. The object brightened by 0.2 mag in 5 hours from 2021-11-28.656 UT.
We found that the spectroscopic characteristics are similar to those of M31N 2007-10a, a "narrow-lined He nova (He/Nn)" proposed by Shafter et al. 2011. The large amplitude (∼ 10 mag, #15067) is also consistent that this object is a nova. Because of the narrow Hα line, which is unusual for novae, there is a possibility that this object is a WZ Sge-type dwarf nova with a very large amplitude. The characteristics of our spectra are also similar to those of (the WZ Sge-type dwarf nova) V455 And (Nogami et al. 2009). In any case, the rising rate of ∼ 3 mag/d (#15067) is slower than those of typical classical/dwarf novae. Follow-up observations are needed. | 2021-11-29 12:07:00 | optical,cataclysmic variable,nova,transient,variables | 2021-11-29 | 12:07:00 | 2,380 | [
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] | 15,070 |
15,073 | Classical nova AT2021afpi, a possible EM counterpart to IC211125A, is in X-ray outburst | Vaidehi S. Paliya (ARIES, India) | Master-Tavrida auto-detection system has reported a rapid 10-mag brightening of an optical transient AT2021afpi or MASTER OT J030227.28+191754.5 (ATEL #15067) close-in-time to the IceCube detected neutrino event IceCube-21125A (GCN #31126). This object has subsequently been identified as a classical nova (ATEL #15069, #15072). A prompt Swift-XRT target of opportunity observation (photon counting mode) was requested and the target was observed starting from 2021-11-28 19:33:02 (UT) for a net exposure of 2 ksec. A bright X-ray source positionally consistent with AT2021afpi was found with the optimized coordinates: RA, Decl.=45.61402 deg., 19.29856 deg. (=03h 02m 27.36s, +19d 17m 54.8s), error radius 2.2'' (90% confidence). There are hints of flux variability with the count rate varying between 0.4-1.1 cps (100 sec binning). There are no previous X-ray detections of this object. Multi-wavelength follow-up observations are encouraged. | 2021-11-29 13:12:00 | optical,x-ray,neutrinos,cataclysmic variable,nova,transient,variables | 2021-11-29 | 13:12:00 | 944 | [
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] | 15,071 |
15,074 | Spectroscopic and Photometric confirmation of MASTER OT J030227.28+191754.5 as a very large-amplitude WZ Sge-type dwarf nova | Keisuke Isogai, Yusuke Tampo, Masayuki Yamanaka, Naoto Kojiguchi, Kenta Taguchi, Junpei Ito, Masaaki Shibata, Daisaku Nogami, Taichi Kato (Kyoto University) | We report the results of our further follow-up spectroscopy and photometry of the large outburst (~10 mag) transient MASTER OT J030227.28+191754.5 = AT 2021afpi = PNV J03022732+1917552. As already reported to ATel #15067, #15069, #15072, #15073, this object was reported as a possible counterpart to IceCube-211125A. Zhirkov et al. indicated that this object is an He/N-class nova based on their low-resolution spectrum (ATel #15067). We also reported our spectra and proposed that this object is not a usual classical nova but a possible "narrow-lined He nova" or large-amplitude dwarf nova (ATel #15072). We additionally obtained low and moderate resolution (R ∼ 500 and 1500) spectra from 2021-11-29.509 UT to 2021-11-29.521 UT using the fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019) mounted on the 3.8 m Seimei telescope (Kurita et al. 2020) at Okayama Observatory of Kyoto University.
Our quick look spectra on 2021-11-29 show Balmer, He I, and He II emission lines. In comparison with our spectra obtained last night (ATel #15072), Bowen blend and O I 7773 were obscured, and He I/II lines were also weakened. Furthermore, the profiles of Hβ and He I/II lines changed from single to double-peaked. The peak separation of He I/II is about 500 km/s and that of Hβ is about 250 km/s. These features indicate that this object is not a classical nova but a dwarf nova.
We also performed time-series photometry for about 7 hours by using a 40-cm telescope. We detected double-peaked modulations with a period of 0.05935 +/- 0.0020 day and amplitudes of 0.05 mag. The characteristics are consistent with those of early superhumps. Thus, we conclude that this object is a WZ Sge-type dwarf nova having the largest outburst amplitude so far. | 2021-11-30 00:59:00 | optical,cataclysmic variable,nova,transient,variables | 2021-11-30 | 00:59:00 | 1,778 | [
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] | 15,072 |
15,075 | Triggered TELAMON Radio Observations of Compact Radio Sources in the Field of IceCube-211123A | Matthias Kadler (JMU Wuerzburg), Florian Eppel (JMU Wuerzburg), Jonas Hessdoerfer (JMU Wuerzburg), Philip Weber (JMU Wuerzburg), Jonas Sinapius (DESY) for the TELAMON Team | The TELAMON program (Kadler et al. 2021, Proc. ICRC 2021) is using the Effelsberg 100-m telescope of the MPIfR (Max-Planck-Institut fuer Radioastronomie) to monitor the radio spectra of active galactic nuclei (AGN) under scrutiny in astroparticle physics, namely TeV blazars and candidate neutrino-associated AGN.
We have observed all nine compact radio sources listed at maximum brightness of 100mJy or higher in the rfc_2021c_catalog that are positionally coincident with the recently detected high-energy neutrino IceCube-211123A (GCN #31110) on Nov 28, 2021, in the 2cm band (14GHz - 16GHz). All sources are detected at flux densities near their historical (low-frequency) RFC levels. None of them exceeds the historical maximum. The by far brightest source is J1751+0938 (PKS1749+096), which is also associated with a GeV and TeV gamma-ray source. It has been in a rather low radio state for several months recently. We found an inverted spectrum at ~2.5Jy at 14.25GHz and 2.7Jy at 16.75GHz with a spectral index of about +0.5 indicating high-frequency activity. | 2021-11-30 03:29:00 | radio,gamma ray,tev,vhe,neutrinos,agn,blazar,request for observations | 2021-11-30 | 03:29:00 | 1,068 | [
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15,076 | TELAMON Detection of a High-State Compact Radio Source and Gamma-Bright AGN Positionally Coincident with Two IceCube Bronze Neutrino Events (IceCube-191231A and IceCube-211125A) | Matthias Kadler (JMU Wuerzburg), Florian Eppel (JMU Wuerzburg), Jonas Hessdoerfer (JMU Wuerzburg), Philip Weber (JMU Wuerzburg), Jonas Sinapius (DESY), Raniere de Menezes (JMU Wuerzburg) for the TELAMON team | The TELAMON program (Kadler et al. 2021, Proc. ICRC 2021) is using the Effelsberg 100-m telescope of the MPIfR (Max-Planck-Institut für Radioastronomie) to monitor the radio spectra of active galactic nuclei (AGN) under scrutiny in astroparticle physics, namely TeV blazars and candidate neutrino-associated AGN.
We have observed all nine compact radio sources listed in the the rfc_2021c_catalog that are within 3 degree distance of the nominal position of the recently detected high-energy neutrino IceCube-211125A (GCN #31126) on Nov 28/29, 2021, at frequencies between 4.85GHz and 24.75GHz. Seven sources are detected at flux densities near their historical (low-frequency) RFC levels. We point out two sources that are noteworthy:
J0258+2030 is furthermore particularly noteworthy as it is associated with the Fermi-LAT gamma-ray source 4FGL J0258.1+2030 and also positionally coincident with an earlier IceCube bronze neutrino event (IceCube-191231A, see GCN # 26620). To our knowledge this is the first case of a gamma-ray bright AGN consistent with two IceCube neutrino bronze or gold events and the radio flare coincident with IceCube-211125A makes it a particularly promising possible association. | 2021-11-30 03:32:00 | radio,gamma ray,tev,neutrinos,agn,blazar,request for observations | 2021-11-30 | 03:32:00 | 1,210 | [
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] | 15,074 |
15,077 | Mass-loss rate constraint on the Type Ia SN 2021aefx from ATCA radio observations | E. Kundu (Michigan State University), P. Lundqvist (Stockholm University), S. D. Ryder (Macquarie University), M. Perez-Torres (IAA-CSIC, Granada), C.-I. Bjornsson (Stockholm University), C. Fransson (Stockholm University), M. D. Filipovic (Western Sydney University), D. Venkattu (Stockholm University) | We report the non-detection at radio wavelengths of the Type Ia SN 2021aefx, discovered on 2021-11-11 12:30:43.776 UT at the position RA(J2000.0)= 04:19:53.320, DEC(J2000.0)=-54:56:52.60 (TNS Astronomical Transient Report No. 129095). SN 2021aefx occurred in the galaxy NGC 1566 (z=0.005; D=14.9 Mpc from arXiv:2009.04090), and was confirmed to be a Type Ia event 2 days later (TNSCR3899). We observed SN 2021aefx on 2021-11-13 between UT 14:30-17:30 and 2021-11-19 from UT 13:00 to 17:00 using the Australia Telescope Compact Array (ATCA). In the first epoch, we observed the SN at central frequencies of 5.5 GHz, 9 GHz and 18 GHz using a bandwidth of 2 GHz, while for the second epoch only central frequencies of 5.5 GHz and 9 GHz were used. We found no evidence of radio emission at the expected location of SN 2021aefx in either epoch. The 3-sigma upper limits on the flux density were 0.07 mJy (5.5 GHz), 0.06 mJy (9 GHz), and 0.05 mJy (18 GHz) at the first epoch; and 0.04 mJy (5.5 GHz) and 0.03 mJy (9 GHz) at the second epoch. Adopting the host galaxy distance as 14.9 Mpc, the 3-sigma limit of 0.07 mJy at 5.5 GHz corresponds to an upper limit on the monochromatic luminosity of 1.86e25 erg/s. For our standard model with a presupernova wind speed of 100 km/s (see ATels #11324, #12411, #14325) the above limit to the radio luminosity corresponds to an upper limit of 1.6e-8 solar masses per year for the mass-loss rate, assuming that SN 2021aefx exploded on Nov 7 UT, i.e., days before our first observation. The upper limit to the mass-loss rate of SN 2021aefx is among the most stringent upper limits found for Type Ia SNe (Lundqvist et al. 2020 ApJ 890 159), illustrating the importance of probing the radio emission from Type Ia SNe within a radius of about 20 Mpc. We would like to extend our thanks to the ATCA staff for enabling these observations. The ATCA is part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. We acknowledge the Gomeroi people as the traditional owners of the Observatory site. | 2021-11-30 12:00:00 | radio,supernovae,transient | 2021-11-30 | 12:00:00 | 2,116 | [
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] | 15,075 |
15,078 | VERITAS observations of AT2021afpi / MASTER OT J030227.28+191754.5 (discovered during follow-up observations of IceCube-211125A) | John Quinn (University College Dublin) for the VERITAS Collaboration, Brian Metzger (Columbia University), Jeno Sokoloski (Columbia University) | The VERITAS Collaboration reports an upper limit on the very-high-energy (VHE; >100 GeV) gamma-ray flux from the location of AT2021afpi / MASTER OT J030227.28+191754.5, whose discovery was reported in ATel #15067 as a result of follow-up observations of the neutrino candidate IceCube-211125A. VERITAS obtained a 1.5 h exposure on UT20211128 05:46-07:17 and an additional 4.0 h exposure on UT20211129 03:14-07:19. Preliminary analysis of the combined exposures results in no detection, corresponding to a flux upper limit at 99% confidence level of F(>0.24 TeV) ≤ 3.6 × 10-12 cm-2 s-1, or 2% of the Crab Nebula flux.
AT2021afpi was initially classified as a classical He nova (ATel #15069), but is instead likely to be a dwarf nova on the basis of updated optical spectroscopy and detection by Swift XRT (ATels #15072, #15073, #15074).
In the classical nova scenario, AT2021afpi is a possible counterpart to IceCube-211125A. Novae are well established as sources of GeV gamma rays (e.g., Ackermann et al. 2014), and RS Oph was recently detected in the VHE range by H.E.S.S. (ATels #14844, #14857). Classical novae may also be sources of VHE astrophysical neutrinos (e.g., Metzger et al. 2016), particularly early in their evolution.
Questions regarding VERITAS observations should be directed to John Quinn (john.quinn@ucd.ie). VERITAS (the Very Energetic Radiation Imaging Telescope Array System) is located at the Fred Lawrence Whipple Observatory in southern Arizona, USA, and is most sensitive to gamma rays between ∼85 GeV and ∼30 TeV. For further information see the VERITAS web site. | 2021-11-30 17:48:00 | optical,gamma ray,tev,vhe,neutrinos,nova | 2021-11-30 | 17:48:00 | 1,593 | [
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] | 15,076 |
15,079 | HAWC observations of AT2021afpi / MASTER OT J030227.28+191754.5 (discovered during follow-up observations of IceCube-211125A) | Hugo Ayala | We report the results of the HAWC observations around the position of the transient MASTER OT J030227.28+1917554.5 (ATEL #15067). This object was reported as a possible counterpart to the event IceCube-211125A. Our analysis results on the IceCube event can be found in GCN 31153.
Other ATels related to this event are #15069, #15072, #15073, #15074, #15076, and #15078.
No significant event was observed. At the time of the event, the position of the source was transiting above the HAWC detector. The start of the transit time occurred at 02:04:27 UTC and ended at 08:25:49 UTC. During this time, HAWC observes a hotspot of 1.94 sigma pre-trials at position RA=45.48 deg, Dec=19.39 deg with an uncertainty of 0.33 deg.
The spectral information, assuming a power-law with spectral index of -2.3 gives a flux normalization measurement of 6.65e-12 (+1.03e-11 -5.88e-12) TeV-1 cm-2 s-1 at 1 TeV (UL = 1.17e-11 TeV-1 cm-2 s-1).
If the spectral index is assumed to be -3.0, the significance of the hotspot increases to 2.51 sigma pre-trials. The normalization measurement becomes 2.55e-11 (+2.40e-11 -1.82e-11) TeV-1 cm-2 s-1 at 1 TeV (UL = 4.95e-11 TeV-1 cm-2 s-1).
We will update with another ATel after we perform measurements over several transits.
The HAWC contact people for this analysis are Jose Andres Garcia-Gonzalez (IF-UNAM, jagarcia@fisica.unam.mx, ITESM-EIC, anteus79@tec.mx) and Hugo Ayala (PSU, hagayala@psu.edu). HAWC is a TeV gamma-ray water Cherenkov array located in the state of Puebla, Mexico, that monitors two-thirds of the sky every day with an instantaneous field of view of ~2 sr. HAWC website: https://www.hawc-observatory.org/ | 2021-12-01 04:43:00 | gamma ray,tev,transient | 2021-12-01 | 04:43:00 | 1,656 | [
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] | 15,077 |
15,080 | Observations of radio sources J0258+2030 and J0245+2405, possible counterparts to IceCube-211125A, with the Zwicky Transient Facility | Simeon Reusch (DESY), Robert Stein (Caltech) | We report optical observations of two compact radio sources identified as possible counterparts (ATel #15076) to high-energy neutrino IceCube-211125A (GCN #31126).
The Zwicky Transient Facility (ZTF) has observed the region repeatedly as part of routine survey operations, most recently on 2021-11-24.27 UT. All images were processed through the ZTF reduction and image subtraction pipelines at IPAC (Masci et al. 2019).
J0245+2405 has a catalogued redshift of z=2.2. No flaring activity has been seen in recent weeks, with the most recent detection at r=19.86+/-0.10 for J0245+2405 on 2021-09-02.47 UT. The full lightcurve for J0245+2405 is given here .
J0258+2030 is a BL Lac, and was coincident with both IC191231A and IC211125A. Near the time of the first neutrino detection on 2019-12-31.46 UT, there are no indications of short-term flaring activity. The flux in the r-band does appear to be above the historical average in our data, but not significantly so. No flaring activity was seen in recent weeks coincident with the detection of the second neutrino, with the source instead appearing to be in a low optical state. The most recent detection was r=20.60+/-0.17, also on 2021-09-02.47 UT. The full lightcurve for J0258+2030 is given here .
ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; DESY, Germany; TANGO, Taiwan; UW Milwaukee, USA; LANL, USA; TCD, Ireland; IN2P3, France. | 2021-12-01 05:33:00 | radio,optical,neutrinos,agn,blazar,transient | 2021-12-01 | 05:33:00 | 1,464 | [
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] | 15,078 |
15,081 | Prediscovery detection of AT2021afpi/MASTER OT J030227.28+191754.5, 8 hours before the IceCube-211125A neutrino event | K. Sarneczky, J. Vinko, L. Kiss (Konkoly Observatory) | We report prediscovery detection of AT2021afpi/MASTER OT J030227.28+191754.5 (ATel #15067, #15069, #15073, #15074, #15078, #15079) on stacked, unfiltered CCD frames taken with the 10560x10560 STA 1600LN CCD camera on the 0.6/0.9m Schmidt telescope at Piszkesteto Station of Konkoly Observatory at 2021-11-24 21:53 UT, 8.5 hours before the IceCube-211125A neutrino event. The total exposure time was 24 sec. Forced photometry at the transient position resulted in a clear detection at 19.13 +/- 0.22 mag tied to r-band SDSS DR16 photometry of nearby comparison stars. This is ~1 magnitude brighter than the combined r-band SDSS photometry of the transient and its close optical companion, which were unresolved on our CCD frames. The detection of AT2021afpi already brightening at 8.5 hours before the IceCube-211125A trigger suggests that the transient is probably unrelated to the neutrino event. This is consistent with the classification of AT2021afpi as a WZ Sge-type dwarf nova (Isogai et al, ATel #15074), since neutrino emission from such objects is not likely. | 2021-12-01 08:35:00 | optical,neutrinos,cataclysmic variable,nova,star,transient,variables | 2021-12-01 | 08:35:00 | 1,068 | [
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15,082 | Discovery of 9 ASAS-SN Supernova Candidates | J. Brimacombe (Coral Towers Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand), P. Vallely, K. Z. Stanek, C. S. Kochanek, C. Christy, M. Rizzo Smith, S. Bose, T. A. Thompson (Ohio State), B. J. Shappee (IfA-Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus), I. Cruz (Cruz Observatory), R. Cornect (Moondyne Observatory) | During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, the quadruple 14-cm "Leavitt" telescope in Fort Davis, Texas, the quadruple 14-cm "Payne-Gaposchkin" telescope in Sutherland, South Africa, and the quadruple 14-cm "Cassius" and "Paczynski" telescopes in Cerro Tololo, Chile, we discovered several new transient sources. Properties of the supernovae, as well as associated finding charts showing the archival imaging (left) and the follow-up confirmation image (right) are included in the table below:
Follow-up observations are encouraged.
While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-21xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-21xx (AT 2021xyz) to preserve, rather than anonymize, the origin of the transient.
We would like to thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grants GBMF5490 and GBMF10501, NSF grant AST-1908570, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Chinese Academy of Sciences South America Center for Astronomy (CASSACA), and the Villum Fonden (Denmark). For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients. | 2021-12-04 00:39:00 | optical,supernovae,transient | 2021-12-04 | 00:39:00 | 1,604 | [
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] | 15,080 |
15,083 | Candidate Radio Counterparts to the 2021 Nov. X-ray binary outburst in NGC 6440 | Andrew Hughes, Gregory R. Sivakoff, Craig Heinke (Alberta), Jay Strader (Michigan State), Alex Tetarenko (Texas Tech), Arash Bahramian (Curtin), Jamie Kennea (Penn State), Thomas Maccarone (Texas Tech), Liliana Rivera Sandoval (Texas-Rio Grande Valley), Rudy Wijnands (Amsterdam) | We report preliminary results from VLA radio observations of the globular cluster NGC 6440, which recently showed transient X-ray activity from a neutron star X-ray binary (ATel #15033, #15048). We took B config VLA observations on 2021 Nov 24 at 20:19:54-22:43:33 UTC (MJD = 59542.8472-59542.9469), in X-band (8-12 GHz).
We conservatively search a 135" radius centred on the NuSTAR X-ray detection from this outburst (with its 45" error), and detect a radio source 75" from the NuSTAR position. We fit a 2-D Gaussian to this detection, finding a peak flux density of 12.0+/-2.3 muJy with a 1.9+/-0.5" by 0.70+/-0.08â ellipse (major and minor axes) at PA = 14+/-4 deg. This is marginally extended compared to the synthesized beam of 1.3" by 0.75" at PA = 6 deg. We estimate VLA astrometric errors as the larger of the beam/(2*SNR) and a systematic-error limited 1/10th times the Gaussian shape. The source position is RA=17:48:54.139 and Dec=-20:20:44.42 (all positions reported are FK5 J2000) with errors of 0.09" and 0.18", respectively. Fixing the Gaussian to the shape of the beam, the source flux density increases to 13.6 muJy and the position is RA=17:48:54.136 and Dec=-20:20:44.53 with errors of 0.08" and 0.13", respectively. We preliminarily name this source VLA J174854.1-202044. Archival C-band 4-8 GHz VLA images from the MAVERIC project (Shishkovsky et al. 2020, ApJ, 903 ,73) indicate no radio source, with a stacked 3-sigma upper limit of 5.8 muJy. Thus, VLA J174854.1-202044 is likely to be a transient radio source, but we cannot definitely label it as such.
We detect no X-ray source in archival Chandra data for NGC 6440 (ObsIDs 10060, 947, 3799; 96 ks combined) at the location of VLA J174854.1-202044. From 2 photons (0.3-7 keV) within 1", we estimate a 3-sigma upper limit on the quiescent 1-10 keV X-ray luminosity of 2.1e31 erg/s for a Gamma=2.1 power-law absorbed by 1.0e22 cm^-2 (Bahramian et al. 2015, MNRAS, 452, 3475). This luminosity is consistent with fainter quiescent X-ray binaries. VLA J174854.1-202044 is marginally consistent with a faint optical source in archival HST WFC3 observations (F814W=23.3+/-0.1 mag; Proposal Id 12517).
Pike et al. (ATel #15048) combined the NuSTAR position, a ~100 second duration Type-I X-ray Burst, and a preliminary oscillation at 423 Hz (2-sigma confidence), to claim the source in outburst is the accreting millisecond X-ray pulsar SAX J1748.9-2021 (aka NGC 6440 CX-1). Although they note that the 442 Hz spin period of CX-1 differs from the tentative new detection. The optical counterpart of CX-1 is positioned at RA=17:48:52.161 and Dec=-20:21:32.41 (+/-0.15"; Cadelano et al. 2017, ApJ, 844, 53). Although we have never detected a >5-sigma radio source at that position, in our new VLA data we marginally detect a 7.8+/-2.2 muJy source at RA=17:48:52.168 and Dec=-20:21:32.39 with errors of 0.12" and 0.20".
During the VLA observations, MAXI detects a 1-10 keV X-ray luminosity from NGC 6440 of 2e36 erg/s for an 8.5 kpc distance. Assuming a flat spectral index between C- and X-band, VLA J174854.1-202044 and the (marginal) detection of SAX J1748.9-2021 correspond to 5 GHz radio luminosities (L_r = nu L_nu at 5 GHz) of 5e27 and 3e27 erg/s, respectively. Either of these sources would be consistent with a relatively radio quiet neutron star X-ray binary during the decline of an outburst. Given the marginal nature of the association of the NuSTAR source with SAX J1748.9-2021 and the marginal radio detection, we cannot clearly identify that SAX J1748.9-2021 was responsible for the 2021 November outburst in NGC 6440. While there is a strong case that VLA J174854.1-202044 was flaring in the radio, we note that it is 56" from the gravitational centre of NGC 6440 (Pallanca et al. 2021, ApJ, 913, 137), well outside the 6.4" core and just outside the 50" half-light radius of NGC 6440.
We thank the NRAO staff for rapidly scheduling our observations. | 2021-12-04 04:54:00 | radio,optical,x-ray,binary,globular cluster,neutron star,pulsar,star,transient,variables | 2021-12-04 | 04:54:00 | 3,939 | [
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] | 15,081 |
15,084 | Significant NIR brightening of the Blazar 4C+28.07 | L. Carrasco, G. Escobedo, A. Porras, E. Recillas, D. Mayya (INAOE, Mexico) | We report on a new NIR flare of the high redshift QSO (z=1.213) [hb89]0234+285 also known as BZQJ0237+2848, cross-correlated with the radio source 4C+28.07 and the Gamma-ray source 3FGLJ0237.9+2848. On November 13th,2021 JD(2459531.7687), we found the source with NIR fluxes corresponding to J = 14.359 +/- 0.04, H = 13.143 +/- 0.03 and Ks= 12.275 +/- 0.06. On JD 2459132.031 the flux in the H band corresponded to H = 16.117 +/- 0.06. Hence, the source has increased its flux by a factor of 15 in this lapse. The source has shown flaring activity in the past (see ATel #10034, #11261, #12111, #12321, #12401). Our observations are carried out with the 2.1m telescope of the Guillermo Haro Observatory operated by the National Institute for Astrophysics, Optics and Electronics (Mexico), equipped with the instrument CANICA a NIR camera. We encourage further multi-wavelength coverage. | 2021-12-05 00:43:00 | radio,infra-red,gamma ray,agn,blazar,quasar | 2021-12-05 | 00:43:00 | 885 | [
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] | 15,082 |
15,085 | Optical spectroscopy of 4FGLJ0258.1+2030: possible counterpart of the two neutrino events IceCube-191231A and IceCube-211125A | Simona Paiano (INAF/OAR, INAF/IASF-PA) , Aldo Treves (Universitaâ dellâInsubria, INAF/OABrera), Renato Falomo (INAF/OAPD), Paolo Padovani (ESO), Paolo Giommi (ASI), Riccardo Scarpa (IAC, Universidad de la Laguna) | A plausible association inside the error box of the two neutrino events, IceCube-191231A (GCN#26620) and IceCube-211125A (GCN#31126), is the gamma-ray source 4FGLJ0258.1+2030 (MG3J025805+2029). After the second event the associated radio source was detected at a substantially higher flux densities than listed in the RFC catalog (ATEL#15706). The source was proposed as a BL Lacertae object in the BZCAT catalog (Massaro et al., Ap&SS, 357, 75). On 2020 October 08, we obtained an optical spectrum in the range 5000 - 7700 Ang (average S/N ~ 60) of the target (observed g = 21.0, apparent and corrected for extinction r = 17.6 ) at the Gran Telescopio Canarias (10.4 m), using the spectrograph OSIRIS (exposure time = 9000 sec). The spectrum is severely reddened due to galactic extinction ( E(B-V)=1.1 ). The dereddened optical spectrum (see below for the link to the spectrum) is characterized by a featureless continuum described by a power-law shape that confirms the BL Lac classification of the target. No emission lines with Equivalent Width EW > 0.8 Ang are found. From the absence of the absorption lines of the host galaxy, assumed to be a giant elliptical of M(R) -22.9 (Sbarufatti et al., 2005, ApJ, 635, 173), we obtain the redshift lower limit (see details in Paiano et al, 2017, ApJ, 837, 144) of z > 0.3. The spectrum is available in the spectroscopic database ZBLLAC (https://web.oapd.inaf.it/zbllac/). | 2021-12-05 19:07:00 | radio,optical,gamma ray,neutrinos,blazar | 2021-12-05 | 19:07:00 | 1,420 | [
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] | 15,083 |
15,086 | AGILE detects a gamma-ray rebrightening of the blazar PKS 0903-57 | C. Pittori (SSDC and INAF/OAR), A. Bulgarelli (INAF/OAS-Bo), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F. Verrecchia, F. Lucarelli (SSDC and INAF/OAR), S. Vercellone (INAF/OA-Brera), I. Donnarumma (ASI), V. Fioretti, N. Parmiggiani, A. Addis, L. Baroncelli, A. Di Piano (INAF/OAS-Bo), G. Piano, M. Cardillo, A. Ursi, C. Casentini (INAF/IAPS), F. Gianotti, M. Trifoglio (INAF/OAS-Bo), A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), A. Chen (Wits University), A. Argan, E. Costa, E. Del Monte, Y. Evangelista, M. Feroci, L. Foffano, I. Lapshov, E. Menegoni, L. Pacciani, P. Soffitta, V. Vittorini (INAF/IAPS), F. Lazzarotto (INAF/OAPD), G. Di Cocco, F. Fuschino, M. Galli, C. Labanti (INAF/OAS-Bo), M. Marisaldi (University of Bergen), A. Pellizzoni, M. Pilia, A. Trois (INAF/OA-Cagliari), G. Barbiellini (INFN Trieste), F. Longo (Univ. Trieste and INFN Trieste), E. Vallazza (INFN Milano Bicocca), A. Morselli, P. Picozza (INFN and Univ. Roma Tor Vergata), M. Prest (Univ. dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), A. Ferrari (Univ. Torino and CIFS), F. Paoletti (East Windsor RSD Hightstown and INAF/IAPS), L. A. Antonelli (INAF/OAR), P. Giommi, L. Salotti, G. Valentini, and F. D'Amico (ASI) | AGILE is detecting intense gamma-ray activity above 100 MeV from the FSRQ PKS 0903-57 (also known as 5BZU J0904-5735). Integrating from 2021-12-03 08:00 UT until 2021-12-05 08:00 a preliminary multi-source maximum likelihood analysis yields a detection at the level of 6.2 sigma and a flux F(>100 MeV) = (3.4 +/- 0.9) x 10^-6 photons/cm^2/s.
Previous gamma-ray activity from this source was reported by AGILE in ATel #13602 and more recently (on November 19-20, 2021) by Fermi-LAT in ATel #15057.
The AGILE-GRID detection was obtained while AGILE is observing in spinning mode, surveying a large fraction of the sky each day. The source can be monitored with the public mobile application "AGILEScience" developed by the AGILE Team, available for both Android and iOS devices.
Multifrequency observations of PKS 0903-57 are strongly encouraged. | 2021-12-05 20:26:00 | gamma ray,agn,blazar | 2021-12-05 | 20:26:00 | 847 | [
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] | 15,084 |
15,087 | Dwarf Nova AT2021afpi: X-ray Observations | Derek B. Fox (PSU) | The high-amplitude dwarf nova AT2021afpi / Master OT J030227.28+191754.5 (ATel #15067, #15074; see also ATels #15069, #15072, #15073), discovered by the MASTER telescope network during optical follow-up of the IceCube high-energy neutrino event IceCube-211125A (GCN #31126), and with possible coincident TeV gamma-ray emission detected by HAWC (ATel #15079), has been observed at three epochs by NASA's Neil Gehrels Swift Observatory (Swift) and at one epoch by NASA's Nuclear Spectroscopic Telescope Array (NuSTAR). The source is detected in all four datasets; analysis with HEASOFT v6.29 and UK Swift Science Data Centre tools (Evans et al. 2009, MNRAS, 397, 1177) yields the following results (uncertainties in trailing significant figures quoted at 90%-confidence level, throughout).
The first epoch of Swift observations (ObsID 14935001) began at 19:35 UT on 28 Nov 2021, with 1.96 ks exposure yielding 926 counts in the source aperture with an estimated 10 counts background; the observed flux is 2.8e-11 erg cm-2 s-1 or 31 photons cm-2 ks-1 (see also ATel #15073). Single-component models do not provide a satisfactory fit. A sum of thermal bremsstrahlung and power-law components provides a satisfactory fit, with no evidence for soft X-ray absorption. The thermal bremsstrahlung component has kT=0.116(6) keV and contributes 29(6) photons cm-2 ks-1 (0.3-10 keV), while the power-law component has photon index Gamma=1.13(13) and contributes 2.6(4) photons cm-2 ks-1 (0.3-10 keV).
The second epoch of Swift observations (ObsID 14935002) began at 22:52 UT on 29 Nov 2021, with 0.99 ks exposure yielding 182 counts in the source aperture with an estimated 1 count background; the observed flux is 1.1e-11 erg cm-2 s-1 or 9.4 photons cm-2 ks-1. Single-component models do not provide a satisfactory fit. A sum of thermal bremsstrahlung and power-law components provides a satisfactory fit, again with no evidence for soft X-ray absorption. The thermal bremsstrahlung component has kT=0.10(4) keV and contributes 7(4) photons cm-2 ks-1 (0.3-10 keV), while the power-law component has photon index Gamma=1.4(3) and contributes 2.2(6) photons cm-2 ks-1 (0.3-10 keV). The temperature of the thermal bremsstrahlung component is only weakly constrained from below.
The third epoch of Swift observations (ObsID 14935004) and the single NuSTAR observation (ObsID 90701341002) were coordinated: Swift observations began at UT 19:47 on 1 Dec 2021, with 0.95 ks exposure yielding 80 counts in the source aperture with an estimated 1 count background. NuSTAR observations began at 23:31 UT on 1 Dec 2021, with roughly 34 ks exposure yielding 1848 (1761) counts in the source apertures for modules A (B), respectively, with estimated backgrounds of 835 (789) counts.
A joint spectral fit with normalizations free across the instruments yields a satisfactory fit for an unabsorbed power-law spectrum with photon index Gamma=2.24(5) across the full 0.3-100 keV bandpass (with caveats as noted below). The observed flux is 3.0(3)e-12 erg cm-2 s-1 over the 0.3-10 keV XRT bandpass, and 3.1(3)e-12 erg cm-2 s-1 over the 3-100 keV NuSTAR bandpass. The Swift model normalization is roughly 53% of the NuSTAR model normalization, which is well in excess of the indicated statistical uncertainties and may reflect either a flux decline between the two observations or some unaccounted-for complexity in the spectrum at this epoch, for example, a break in the power-law component or the presence of soft X-ray absorption along the line of sight. | 2021-12-06 06:15:00 | optical,x-ray,gamma ray,tev,neutrinos,nova | 2021-12-06 | 06:15:00 | 3,531 | [
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] | 15,085 |
15,088 | Update on HAWC observations of AT2021afpi / MASTER OT J030227.28+191754.5 (discovered during follow-up observations of IceCube-211125A) | Hugo Ayala (PSU), on behalf of the HAWC Collaboration | We update on the results of the HAWC observations (ATel #15079) around the position of the transient MASTER OT J030227.28+1917554.5 (ATel #15067). This object was reported as a possible counterpart to the event IceCube-211125A. Our analysis results on the IceCube event can be found in GCN #31153 .
After looking at data from 5 days, we did not observe a significant event. The time of the data spans the days 2021/11/26 to 2021/11/30. Each day the source position transits HAWC for about 6.35 hours. Since the gamma-ray emission from a dwarf nova is expected to be low, we use a power-law spectrum with an index of -3.0.
The 95% U.L. of the flux normalization is 3.5e-12 TeV-1 cm-2 s-1 at 1 TeV.
The HAWC contact people for this analysis are Jose Andres Garcia-Gonzalez (IF-UNAM, [jagarcia@fisica.unam.mx](mailto:jagarcia@fisica.unam.mx), ITESM-EIC, [anteus79@tec.mx](mailto:anteus79@tec.mx)) and Hugo Ayala (PSU, [hgayala@psu.edu](mailto:hgayala@psu.edu)). HAWC is a TeV gamma-ray water Cherenkov array located in the state of Puebla, Mexico, that monitors two-thirds of the sky every day with an instantaneous field of view of ~2 sr. HAWC website: [https://www.hawc-observatory.org/](https://www.hawc-observatory.org/) | 2021-12-07 06:41:00 | gamma ray,tev,nova,transient | 2021-12-07 | 06:41:00 | 1,224 | [
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] | 15,086 |
15,089 | Spectroscopic classification of transients with the Lick Shane telescope | M. J. Bustamante-Rosell, S. Tinyanont, R. J. Foley (UCSC) | We report the following classifications from spectroscopic observations with the KAST spectrograph on the Shane telescope obtained on 2021 December 6 UT. The targets were supplied by the Young Supernova Experiment. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure a Si II velocity of 9,000 km/s. (2) We measure a Si II velocity of 9,500 km/s. | 2021-12-08 08:05:00 | optical,supernovae,transient | 2021-12-08 | 08:05:00 | 546 | [
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] | 15,087 |
15,090 | Radio non-detections of 3 TDEs | Kate D. Alexander (Northwestern U.), Adelle J. Goodwin, James Miller-Jones (ICRAR - Curtin), Sjoert van Velzen (Leiden U.), Tarraneh Eftekhari, Aprajita Hajela (Northwestern U.), Tanmoy Laskar (Radboud U.), and Yvette Cendes (Harvard U.), on behalf of a larger collaboration | We report new radio observations taken as part of our VLA Large Program dedicated to tidal disruption events (TDEs). Following their public classification by ZTF (Gezari et al. 2021, AstroNote 2021-103; TNS Classification Report No. 10315; TNS Classification Report No. 9924), we observed the TDEs AT2021ehb, AT2021mhg, and AT2021nwa with NSF's Karl G. Jansky Very Large Array (VLA). The data were reduced in CASA using NRAO's standard VLA calibration pipeline. We report the non-detection of radio emission to the following 3-sigma upper limits:
Further observations are planned to check for late-rising radio emission.
Our VLA Large Program (20B-377) began in December 2020 and will continue until 2023. We plan to target new publicly-reported TDEs discovered at z < 0.1, to determine the prevalence of radio emission in TDEs. We will report new results from this program to the community via ATels, TNS AstroNotes, and on our program website (https://sites.northwestern.edu/radiotdes/). For collaboration, or to suggest new targets, please contact the program PI (Kate Alexander, kate.alexander@northwestern.edu) or one of the program co-Is. | 2021-12-08 20:34:00 | radio,tidal disruption event,transient | 2021-12-08 | 20:34:00 | 1,146 | [
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] | 15,088 |
15,091 | Radio detection of the TDE AT2021sdu | Kate D. Alexander (Northwestern U.), James Miller-Jones (ICRAR - Curtin), Sjoert van Velzen (Leiden U.), Dheeraj Pasham (MIT), Tarraneh Eftekhari, Aprajita Hajela (Northwestern U.), Tanmoy Laskar (Radboud U.), and Yvette Cendes (Harvard U.), on behalf of a larger collaboration | We report new radio observations taken as part of our VLA Large Program dedicated to tidal disruption events (TDEs). Following its public classification by ZTF (TNS Classification Report No. 10352), we have been observing the TDE AT2021sdu with NSF's Karl G. Jansky Very Large Array (VLA), beginning on 2021 August 10 UT. The data were reduced in CASA using standard procedures. We detect brightening radio emission consistent with the optical position, with a peak flux density of ~0.7 mJy at ~18 GHz in our most recent multi-frequency observation on 2021 November 28 UT. The spectral index is consistent with self-absorbed synchrotron emission at lower frequencies. We additionally observed the target with the NICER X-ray telescope on 1 Dec 2021. The source was not detected and we set an upper limit on the 0.3-2.0 keV unabsorbed flux of 4e-13 erg/s/cm^2, assuming a 0.1 keV thermal spectrum. Further observations are planned. We encourage additional multi-wavelength follow up of this interesting source.
Our VLA Large Program (20B-377) began in December 2020 and will continue until 2023. We plan to target new publicly-reported TDEs discovered at z < 0.1, to determine the prevalence of radio emission in TDEs. We will report new results from this program to the community via ATels, TNS AstroNotes, and on our program website (https://sites.northwestern.edu/radiotdes/). For collaboration, or to suggest new targets, please contact the program PI (Kate Alexander, kate.alexander@northwestern.edu) or one of the program co-Is. | 2021-12-08 22:09:00 | radio,optical,x-ray,tidal disruption event,transient | 2021-12-08 | 22:09:00 | 1,534 | [
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] | 15,089 |
15,092 | Fermi-LAT and Swift observations of flaring activity from the FSRQ PKS 0346-27 | G. La Mura (LIP, Portugal) on behalf of the Fermi Large Area Telescope Collaboration, R. Prince (CFT, Poland) | On November 24, 2021, the Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, observed increased gamma-ray activity from a source positionally consistent with the flat-spectrum radio quasar PKS 0346-27, also known as 4FGL J0348.5-2749 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 03h 48m 38s, Dec. = -27d 49' 14'' (J2000; Beasley et al. 2002 ApJS, 141, 13), and a reported redshift of z=0.991 (White et al. 1988 ApJ, 327, 561). Enhanced gamma-ray flux, with high-energy photon emission detected by the LAT and the H.E.S.S. observatory, had already been reported on November 6 (Wagner and Rani, ATel #15020), leading to the activation of Swift ToO programs (ToO IDs 16630 and 16639). Following a preliminary analysis that resulted in a daily average flux 50 times brighter than the 4FGL catalogue average value, an additional Swift ToO request was submitted (ToO ID 16640).
Swift executed three observations of the source in photon counting mode, on November 24, 26 and 28, accumulating, respectively, 2500s, 2180s, and 1865s of exposure. An X-ray source positionally consistent with PKS 0346-27 was detected by XRT in all visits. Preliminary analysis suggests that the source could be modelled with an absorbed power-law, using a fixed Galactic Hydrogen column density of 8.36 X 10^19 cm^-2 (HI4PI Collaboration 2016, A&A, 594, 116). On November 24, the X-ray data in the 0.3-10keV band resulted in a flux of (2.32+/-0.28) X 10^-12 erg cm^-2 s^-1, with a photon index of 1.67+/-0.35. On November 26, the estimated flux had decreased to (1.52+/-0.38) X 10^-12 erg cm^-2 s^-1, with a photon index of 2.45+/-0.89. Finally, the source was detected again on November 28 with a flux of (1.50+/-0.25) X 10^-12 erg cm^-2 s^-1 and a photon index of 1.82+/-0.53 (statistical uncertainties only). The source is listed in the 2SXPS catalogue with a flux estimate of (2.75+/-0.08) X 10^-12 erg cm^-2 s^-1 (Evans et al. 2020, ApJS, 247, 54).
The LAT monitoring provided simultaneous coverage of the gamma-ray evolution of this flare. On November 24, the source was detected with a daily averaged gamma-ray flux (E>100MeV) of (2.19+/-0.36) X 10^-6 photons cm^-2 s^-1 and a spectral index of 1.85+/-0.07. On November 26, it was detected with an average daily flux of (0.83+/-0.20) X 10^-6 photons cm^-2 s^-1 and a spectral index of 2.08+/-0.17. Finally, on November 28, it was detected with a flux of (0.13+/-0.08) X 10^-6 photons cm^-2 s^-1 and a spectral index of 2.21+/-0.41 (statistical uncertainties only). The 4FGL average flux and spectral index are, respectively, (0.044+/-0.002) X 10^-6 photons cm^-2 s^-1 and 2.18+/-0.02.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. This source is included in the "LAT Monitored Sources" and, consequently, a preliminary estimation of the daily gamma-ray flux observed by Fermi-LAT will be publicly available ( http://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/ ). We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Bindu Rani ( binduphysics@gmail.com ).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. We further acknowledge commitment of the Swift Team, Observatory Duty Scientists, and PI, who made these observations possible. | 2021-12-09 00:28:00 | radio,x-ray,gamma ray,agn,blazar,quasar,transient | 2021-12-09 | 00:28:00 | 3,595 | [
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] | 15,090 |
15,093 | High ionization conditions finally emerge as Nova Cas 2021 (V1405 Cas) ends the plateau and embraces a steady decline | U. Munari (INAF Padova), P. Valisa, S. Dallaporta, and A. Maitan (ANS Collaboration) | Nova Cas 2021 (= PNV J23244760+6111140 = V1405 Cas) was discovered on 2021 March 18.424 by Yuji Nakamura and measured at B=9.58, V=9.27, R=8.78 on March 18.684 UT (CBET #4945). At that time the nova was still rising in brightness and high ionization features (HeII, Bowen blend) were briefly visible on its spectra (ATel #14471 #14472). The high ionization were all gone by the following day when the nova completed the rise in brightness to B=8.22, V=7.72, R=7.24, I=6.94 and the spectra displayed only Balmer and HeI emission lines, as we reported for March 19.76 UT in ATel #14476. We are since then keeping a constant photometric and spectroscopic watch of Nova Cas 2021 with various ANS Collaboration photometric instruments (primarily ID 0310 and ID 2203), and with Varese 0.84m+Echelle, Asiago 1.22m+B&C, and Asiago 1.82m+Echelle telescopes.
For the first seven months, Nova Cas 2021 lingered around maximum brightness in a sort of plateau, with V mag varying between 6.4 and 8.4 mag with no less than eight distinct rebrightenings, as the ANS Collaboration BVRI lightcurve presented below well highlights, attaining maximum brightness on May 9.03 UT at V=5.449, B-V=+0.652, V-R=+0.452, and V-I=+0.833. The passage through such short-lived maximum turned the spectrum of Nova Cas 2021 to a text-book example of a FeII-type event (ATel #14614), and it was soon followed by detection of the nova in gamma-rays by Fermi-LAT (ATel #14658). Such a detection sprinted forward the expectation for synchrotron signatures of particle-accelerating shocks, but none was found in VLA radio observations during June that recorded only normal thermal emission from the nova (ATel #14731).
ANS Collaboration BVRI lightcurve shows that Nova Cas 2021 left the seven-months-long plateau around the end of October/beginning of November 2021, ending the incessant up-and-downs in brightness and embracing instead a linear decline at a rate of 0.036 mag/day which is continuing well into December, with B-V and V-I colors that are becoming progressively bluer, while V-R remains flat. Our latest measurement for Dec 7.761 UT provides V=9.184 B-V=+0.276, V-R=+0.939, and V-I=+0.828, with the nova now close to 4 magnitudes below the peak brightness of May 9.
In parallel with the end of the plateau and the beginning of the linear photometric decline, also the spectra transitioned to an entirely new state, as illustrated by the figure below where a small portion of the latest Echelle spectra we obtained with the Varese 0.84m is presented: (1) the ionization conditions are rapidly increasing as illustrated by the appearance and steady growth in intensity of HeII and the 4640 Bowen blend (and parallel disappearance of low-ionization features like FeII), (2) the P-Cyg absorptions that have always been rather strong during the plateau (cf. ATel #14478, #14482, #14577, #14622, #14665) are now much reduced in intensity, (3) the emission line profiles are developing a distinctive three-component profile, best described for the Hbeta shown below as a double-peaked central component (640 km/s in width at half maximum), superimposed to a trapezoidal and broader component (WHM=1780 km/s), on top of a wider pedestal at the bottom (WHM=2860 km/s, FWZI=3680 km/s).
It is interesting to note on the figures below how a weak and narrow P-Cyg absorption (at 2085 km/s from the photocenter of Hbeta emission) has reappeared on the last two Echelle spectra for 2021 Dec 6 and 7, simultaneous with an halt in the linear photometric decline from the plateau. It seems be forming in a new/reinforced wind blowing off the central star, internal to the larger ejecta where the 3-components emission line profiles originate.
Echelle spectra and lightcurve of Nova Cas 2021 | 2021-12-09 00:37:00 | radio,optical,gamma ray,nova,star | 2021-12-09 | 00:37:00 | 3,755 | [
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] | 15,091 |
15,094 | Swift observations of long X-ray flaring activity from the blazar PKS 0903-57 | Raj Prince (CFT, Poland) | Following the event of flux enhancement in blazar, PKS 0903-57 at gamma-ray by Fermi-LAT (Atel #15057) and X-ray by Swift-XRT (Atel #15058), we performed target of opportunity observations using Swift on November 28, December 02, and 06, 2021.
Swift observed the source in photon counting mode on November 28 and December 02 & 06, accumulating 1 ks of exposure. Preliminary analysis suggests that the source spectrum in the energy range 0.3-10 keV could be modeled with an absorbed power-law, using a fixed Galactic Hydrogen column density of 2.6 X 10^21 cm^-2 (HI4PI Collaboration 2016, A&A, 594, 116). On November 28, the X-ray data in the 0.3-10keV band resulted in a flux of (4.92+/-0.74) X 10^-12 erg cm^-2 s^-1, with a photon index of 1.57+/-0.52. On December 02, the estimated flux was increased to (7.41+/-0.89) X 10^-12 erg cm^-2 s^-1, with a photon index of 1.79+/-0.48. The estimated flux using the observation of December 06 is (6.93+/-0.89) X 10^-12 erg cm^-2 s^-1 with a photon index of 1.98+/-0.56. Compared with the Swift activity reported on November 23 (Atel #15058), the fluxes are almost similar within the errorbar, suggesting long-term flaring activity in X-ray. The X-ray fluxes in 0.3-10 keV on November 12, 15, and 18 were estimated as (7.3 +/- 0.7)e-12, (5.5 +/- 0.6)e-12, and (8.1 +/- 0.7)e-12 erg cm^-2 s^-1, respectively. The estimated fluxes from November 12 to December 06 show a long flaring activity in X-ray.
We also performed simultaneous Swift/UVOT observations. The estimated uncorrected magnitudes are, B=15.71 +/- 0.04, U=16.63 +/- 0.05, V=15.01 +/- 0.05, W1=17.48 +/- 0.07, M2=18.39 +/- 0.10, and W2=18.32 +/- 0.07 on November 28. The source brighten up a bit on Decemebr 06 with magnitudes, B=15.32 +/- 0.04, U=16.09 +/- 0.04, V=14.78 +/- 0.05, W1=16.92 +/- 0.06, M2=17.62 +/- 0.08, and W2=17.53 +/- 0.06, suggesting a increase activity in optical-UV also. Simultaneous to the X-ray and optical-UV activity, a high energy activity in gamma-ray is also reported by AGILE (Atel #15086) with integrated flux F(>100 MeV) = (3.4 +/- 0.9) x 10^-6 photons/cm^2/s observed between 2021-12-03 08:00 UT and 2021-12-05 08:00 UT, suggesting the multi-wavelength activity in the source.
In consideration of the ongoing activity of this source, also confirmed by the Swift observations, we strongly encourage further multi-wavelength observations.
We further acknowledge the commitment of the Swift Team, Observatory Duty Scientists, and PI, who made these observations possible. | 2021-12-09 07:00:00 | optical,ultra-violet,x-ray,gamma ray,agn,blazar,quasar | 2021-12-09 | 07:00:00 | 2,510 | [
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] | 15,092 |
15,095 | A correction to ATel 15048 | Sean Pike (Caltech), Nobuyuki Kawai (Tokyo Tech), Tatehiro Mihara (RIKEN), Hitoshi Negoro (Nihon U.) | We report an erratum in ATel 15048, in which we incorrectly reported a preliminary detection of pulsations at 423 Hz from the source MAXI J1749-204. The preliminary detection was in fact at 443 Hz, which is consistent with the previously measured pulse frequency of SAX J1748.9-2021. The error was purely typographical on the part of the corresponding author -- indeed we did not even search for pulsations at 423 Hz. As indicated in ATel 15048, we only performed a Z^2_1 search for the frequency ranges 435-455 Hz and 195-215 Hz. We apologize for the error, and in particular for the adverse impact it may have had on the work detailed by Hughes et al. (ATel 15083). | 2021-12-09 07:59:00 | neutron star,pulsar,star,transient,a comment | 2021-12-09 | 07:59:00 | 667 | [
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] | 15,093 |
15,096 | Additional and Updated Spectroscopic Classification of Optical Transients with the Lick Shane telescope | M. J. Bustamante-Rosell, S. Tinyanont, R. J. Foley (UCSC) | We report additional and updated (Bustamante-Rosell et al ATel #15089) classifications from spectroscopic observations with the KAST spectrograph on the Shane telescope obtained on 2021 December 6 UT. The targets were supplied by the Young Supernova Experiment and GAIA. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: (1) AT2021afkg has a blue continuum and broad emission lines consistent with those of a Seyfert galaxy. The spectrum is bluer than an archival SDSS spectrum of the nucleus with consistent H-alpha FWHM of 4,700 km/s. The flux increase in recent weeks would correspond to a M ~ -22 mag object, ruling out nearly all known supernovae and tidal disruption events. AT2021afkg may represent an exceptional accretion event. (2) We measure a Si II velocity of -10,300 km/s. (3) We measure a Si II velocity of -10,000 km/s. | 2021-12-09 11:52:00 | optical,agn,supernovae,tidal disruption event,transient | 2021-12-09 | 11:52:00 | 879 | [
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] | 15,094 |
15,097 | Radio detection of the TDE AT 2021sdu at 5.1 GHz with e-MERLIN | Javier Moldon (IAA-CSIC, Granada), Miguel Perez-Torres (IAA-CSIC, Granada), Erik Kool (Stockholm University), Seppo Mattila (University of Turku), Thomas Reynolds (University of Turku) | We report the radio detection of the tidal disruption event (TDE) AT 2021sdu with the electronic Multi-Element Radio Linked Interferometer (e-MERLIN) at 5.1 GHz. AT 2021sdu was classified as a TDE by ZTF (TNS Classification Report No. 10352). We observed AT 2021sdu with e-MERLIN on 4 November 2021 and 1 December 2021, and detected it in both epochs with flux densities of ~0.1 and ~0.2 mJy at 5.1 GHz, respectively. The observations provide accurate source localization with a synthesized beam size below 50 milliarcseconds.
These detections suggest that the emission at 5.1 GHz is rising towards its maximum. Our detection of AT 2021sdu on 4 November 2021 precedes the VLA detection at 18 GHz, at a level of ~0.7 mJy, reported by Alexander et al. (ATel #15091) by 24 days. Given the significantly higher level of emission at 18 GHz on 28 November 2021, and the observed increase of emission at 5.1 GHz between November 4 and December 1 with e-MERLIN, we deem it likely that the TDE emission at 18 GHz is currently around its peak of emission or past it. We will continue the monitoring with e-MERLIN under our TDE programme, using 5.1 and 1.5 GHz observations, and encourage further radio monitoring with other facilities.
We thank the e-MERLIN for supporting our observations and extend our thanks to the e-MERLIN staff for enabling these observations. e-MERLIN is a National Facility operated by the University of Manchester at Jodrell Bank Observatory on behalf of STFC. | 2021-12-09 23:29:00 | radio,tidal disruption event,transient | 2021-12-09 | 23:29:00 | 1,478 | [
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] | 15,095 |
15,098 | MASTER OT J073807.40+174219.2 brightening during IceCube-211208A observations | K. Zhirkov, V. Lipunov, E. Gorbovskoy, P. Balanutsa, A. Kuznetsov, O. Gress, G. Antipov, D. Vlasenko, N. Tiurina, D. Zimnukhov, V. Senik, V. Topolev, A. Chasovnikov, E. Minkina, V. Grinshpun, D. Cheryasov, Ya. Kechin, Ya. Kechin, T. Pogrosheva, V. Shumkov (Lomonosov MSU), R. Rebolo, M. Serra(IAC), D. A. H. Buckley (SAAO), N. M. Budnev (ISU, API), R. Podesta, C. Lopez, F. Podesta, C. Francile (OAFA), A. Tlatov, D. Dormidontov (KSS, Pulkovo observatory), A. Gabovich(BSPU) | MASTER Global Robotic Net ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) started IceCube-211208A (IceCube GCN #31191, S.Barthelmy NASA GCN page, Ttrigger=2021-12-08 20:02:51.1UT, RA,Dec(2000): 114.52 (+2.82d -2.50d); +15.56(+1.81 -1.39) error-box observations 640 sec after notice time and 682 sec after trigger time at 2021-12-08 20:14:13 UT (Lipunov et al. GCN #31190), see cover map https://master.sai.msu.ru/site/master2/event.php?id=1808302
We observed it at MASTER-Amur, MASTER-Kislovodsk, MASTER-IAC, MASTER-SAAO, MASTER-OAFA and analyzed MASTER archive images since 2004 of the sources, that can be related with this event. We detected MASTER OT J073807.40+174219.2 ( PKS 0735+17 Blazar, Savchenko et al. Atel #15021) brightening up to 14.1m (0.2m/12h) during last nights observations Observation and reduction will be continued. Spectral observations are required. | 2021-12-10 00:16:00 | optical,neutrinos,agn,blazar,transient,variables,request for observations | 2021-12-10 | 00:16:00 | 909 | [
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15,099 | Fermi-LAT Gamma-ray Observations of IceCube-211208A | S. Garrappa (DESY-Zeuthen), S. Buson (Univ. of Wuerzburg), J. Sinapius (DESY-Zeuthen) and M. Kadler (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration | We report an analysis of observations of the vicinity of the high-energy IC211208A neutrino event (GCN 31191) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2021-12-08 at 20:02:51.1 UT (T0) with J2000 position RA = 114.52 (+2.82, -2.50) deg, Decl. = 15.56 (+1.81, -1.39) deg (90% PSF containment). Two cataloged gamma-ray (>100 MeV) sources are located within the 90% IC211208A localization region (4FGL-DR2, The Fermi-LAT collaboration 2020, ApJS, 247, 33). These are 4FGL J0738.4+1539, associated with the radio source of unknown type NVSS J073824+153839 at 0.13 deg and 4FGL J0743.1+1713, associated with the BL Lac object TXS 0740+173 at 2.05 deg. Based on a preliminary analysis of LAT data at timescales of 1-month and 1-day prior to T0, these objects are not significantly detected (>5sigma).
We searched for intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IC211208A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC211208A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 3.0e-10 ph cm^-2 s^-1 for ~13-years (2008-08-04 to 2021-12-08 UTC), and < 4.5e-9 (< 7.0e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.
In the vicinity of the IC211208A best-fit position, outside the 90% localization region at 2.1 deg from the best-fit IC211208A localization, the cataloged >100 MeV gamma-ray source 4FGL J0738.1+1742 is significantly detected (> 5 sigma) integrating 1-day LAT data before T0. This source is associated with the BL Lac object PKS 0735+17 at z = 0.45 (Gattano et al, 2018 A&A, 618, A80). Preliminary analysis indicates that on 2021-12-08 the gamma-ray source was observed with a daily averaged flux (E>100 MeV) of (3+/-1) x 10^-7 photons cm^-2 s^-1 (statistical uncertainty only), about 5 times greater than the average flux reported in the fourth Fermi LAT source catalog (4FGL-DR2). The source was significantly detected at 1-day timescale on 2021-12-01 and was observed on 2021-12-04 with peak daily flux value of (5+/-2) x 10^-7 photons cm^-2 s^-1 (statistical uncertainty only), about 10 times greater than the average 4FGL-DR2 flux. The source was reported to be in optical brightening on 2021-11-08 and is currently at its brightest state in R band https://vo.astro.spbu.ru/sites/default/files/optic/pks0735R.png (see also ATel #15021).
Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For these observations the Fermi-LAT contact persons are S. Garrappa (simone.garrappa at desy.de) and S. Buson (sara.buson at gmail.com).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. | 2021-12-10 04:18:00 | radio,optical,gamma ray,neutrinos,agn,blazar,transient,request for observations | 2021-12-10 | 04:18:00 | 3,108 | [
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15,100 | Significant optical decay and brightening in blazar PKS 0735+17 coincident with IceCube-211208A | K. Zhirkov, V. Lipunov, E. Gorbovskoy, P. Balanutsa, A. Kuznetsov, O. Gress, G. Antipov, D. Vlasenko, N. Tiurina, D. Zimnukhov, V. Senik, V. Topolev, A. Chasovnikov, E. Minkina, V. Grinshpun, D. Cheryasov, Ya. Kechin, Ya. Kechin, T. Pogrosheva, V. Shumkov (Lomonosov MSU), R. Rebolo, M. Serra(IAC), D. A. H. Buckley (SAAO), N. M. Budnev (ISU, API), R. Podesta, C. Lopez, F. Podesta, C. Francile (OAFA), A. Tlatov, D. Dormidontov (KSS, Pulkovo observatory), A. Gabovich (BSPU) | MASTER Global Robotic Net (Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L) reports on the significant optical decay and brightening in a blazar PKS 0735+17 and on a significant detection of a lower limit on the degree of linear polarization.
In Atel #15098 we reported on the high optical state of PKS 0735+17. To confirm whether or not this object might be the source of IceCube-2112108A we conducted follow-up observations at MASTER-IAC, MASTER-SAAO, MASTER-OAFA and MASTER-Kislovodsk.
After analyzing our observations we discovered that PKS 0735+17 significantly decayed 4 days before the neutrino and brightened to the past level several hours after the neutrino with no significant variability afterwards.
Considering that TXS 0506+056, source of IceCube-170922A, showed a similar picture (Lipunov et al, ApJL, 896, L19, 2020) albeit in a shorter timescale(several hours), it is likely that PKS 0735+17 is a source of IceCube-211208A.
Polarization observations were made by MASTER-IAC during the night of 2021-12-10. We report on a significant detection of a lower limit on the degree of linear polarization .
Judging from these and from the detection of enhanced emission from the blazar by Fermi-LAT(Atel #15099) we conclude that the BL Lac object PKS 0735+17 is a likely source of IceCube-211208A even though it is slightly outside the 90% of the localization error-box (GCN #31191 , https://gcn.gsfc.nasa.gov/other/icecube_211208A.gcn3).
Multiwavelength observations are highly encouraged. | 2021-12-10 19:15:00 | optical,neutrinos,agn,blazar,request for observations | 2021-12-10 | 19:15:00 | 1,535 | [
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15,101 | Search for counterpart to NuEm-211209A with ANTARES | Alexis Coleiro (APC/Universite de Paris) and Damien Dornic (CPPM/CNRS) on behalf of the ANTARES Collaboration. | Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported AMON IC-HAWC coincidence NuEm-211209A alert (GCN#31192). No up-going muon neutrino candidate events were detected within 3 degrees from the coincidence coordinates over a time period [12/09/2021 00h50 - 04h39 UTC] corresponding to 75% of the HAWC transit time mentioned in the AMON notice, and during which the potential source remained visible in the up-going field of view of ANTARES. This leads to a preliminary 90% confidence level upper limit on the muon-neutrino radiant fluence from a point source of about 15 GeV.cm^-2 over the energy range 3 TeV â 3.3 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and about 26 GeV.cm^-2 (0.5 - 290 TeV) for an E^-2.5 spectrum. These indicative limits have been computed for the end of the HAWC transit time. A search over an extended time window of +/-1 day has also yielded no detection (53% visibility). ANTARES [http://antares.in2p3.fr/] is the largest undersea neutrino detector (Mediterranean Sea) and it is primarily sensitive to astrophysical neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky. | 2021-12-10 21:33:00 | tev,neutrinos,transient | 2021-12-10 | 21:33:00 | 1,355 | [
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