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14,902 | Maximum NIR light os BL Lac | L. Carrasco, E. Recillas, G. Escobedo, A. Porras, D. Y. Mayya (INAOE, Mexico) | We report on the recent NIR maximum light of BL Lac, identified with the gamma-ray source 2FGLJ2202.8+4216. On August 21th,2021 (JD 2459447.87), we found the source with the following fluxes in the NIR: J= 10.447 +/- 0.03, H = 9.330 +/- 0.04 and Ks = 8.424 +/- 0,05. These are to be compared with our previous observation on MJD 2459382.96, when the source flux corresponded to J = 11.714 +/- 0.03, H = 10.352 +/- 0.04 and Ks = 9.498 +/- 0.04. Hence, the source has had a flux increment of one magnitude in H, in this lapse. This source has shown flaring activity in the past (see ATEL #6572, #8311). The fluxes reported here correspond to a historical maximum since we started monitoring it on JD 2454551.91. 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 strongly encourage further multiwavelength coverage. | 2021-09-08 09:26:00 | infra-red,gamma ray,agn,blazar,transient | 2021-09-08 | 09:26:00 | 993 | [
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14,903 | Enhanced Activity in (2060) Chiron | Matthew Dobson (QUB) , Alan Fitzsimmons (QUB), Megan E. Schwamb (QUB), Michael S. P. Kelley (U. Maryland), Tim Lister (Las Cumbres Observatory), Larry Denneau (IfA, University of Hawaii), Aren Heinze (University of Washington), L. Shingles (QUB), Ken W. Smith (QUB) , John Tonry (IfA, University of Hawaii), Henry Weiland (IfA, University of Hawaii), David R. Young (QUB), Susan Benecchi (PSI), Anne Verbiscer (UVa) on behalf of the ATLAS Survey and the LCO Outbursting Objects Key (LOOK) Project | We report a photometric brightening of Centaur (2060) Chiron via monitoring with the Asteroid-Terrestrial impact Last Alert System (ATLAS) during normal survey operations. o-band photometry during 18 June to 29 August 2021 UTC gives a median phase-corrected absolute magnitude of H(o)=5.05+/-0.08, 0.38 magnitudes brighter than measured throughout the 2016-2020 apparitions. The measured PSF (point-spread-function) FWHM is 1.8 arcsec, consistent with field stars. Co-addition of 20x30 second exposures from 08 August to 29 August shows a possible marginal extension to the PSF of approximately 9" from the centre of Chiron at PA 250 degrees. 4 w-band images were taken on 2021 06 September UTC by a Las Cumbres Observatory (LCO) 1-m telescope at Cerro Tololo Interamerican Observatory (CTIO). Each 245 seceond image was tracked nonsidereally at the rate of the Centaur (where the stars were trailed by 0.4" per exposure). In these deeper exposures, we find no significant extension in PSF or visible coma/tail features.
The Asteroid Terrestrial-impact Last Alert System (ATLAS) project is primarily funded to search for Near Earth Asteroids through NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575; byproducts of the NEO search include images and catalogs from the survey area. This work was partially funded by Kepler/K2 grant J1944/80NSSC19K0112 and HST GO-15889, and STFC grants ST/T000198/1 and ST/S006109/1. The ATLAS science products have been made possible through the contributions of the University of Hawaii Institute for Astronomy, the Queen's University Belfast, the Space Telescope Science Institute, the South African Astronomical Observatory, and The Millennium Institute of Astrophysics (MAS), Chile.
This work makes use of observations from the Las Cumbres Observatory global telescope network. | 2021-09-08 16:12:00 | optical,asteroid,comet,solar system object,star | 2021-09-08 | 16:12:00 | 1,821 | [
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14,904 | Citizen ASAS-SN Discovery of a Likely RCB Variable ASASSN-V J024731.89+635437.9 | C. T. Christy, T. Jayasinghe, K. Z. Stanek, C. S. Kochanek, T. A. Thompson (OSU), M. Wheat, A Sainio (Citizen ASAS-SN), B. J. Shappee (Univ. of Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus) | As part of an ongoing effort by the ASAS-SN project (Shappee et al. 2014, Kochanek et al. 2017), to characterize and catalog bright variable stars using the citizen science project "Citizen ASAS-SN", we report the discovery of a candidate R Coronae Borealis (RCB) variable.
ASASSN-V J024731.89+635437.9 (RAJ2000=02:47:31.89, DEJ2000=63:54:37.9, d~5.0 kpc, Teff~3390 K, BP-RP~3.8 mag, G~12.2, EDR3 source_id=467741901542404736) was classified as an SR variable in the ASAS-SN catalog of variable stars (Jayasinghe et al. 2018-2020). Presently, ASASSN-V J024731.89+635437.9 has more than ~3200 V-band and g-band data points. This system had a quiescent mean magnitude of g~16.1 on UT 2019-10-22. The star dimmed to g~17.1 by UT 2019-11-25 and is currently at g~16.7 as of UT 2021-9-7.
Its unusual g band variability was reported to the ASAS-SN team by participants in the Citizen ASAS-SN project. The ASAS-SN Sky Patrol light curve shows a sudden decline of ~1 mag in the g-band in addition to the large amplitude, irregular pulsations that led to its classification as a semi-regular variable. Such large and rapid declines are typical of dust production episodes in RCB stars. This source is also listed as a Galactic carbon star by Alksnis et al. 2001. The last 100 days of ASAS-SN light curve data may be found here.
RCB stars have carbon-rich atmospheres and typically follow a distinct BP-RP versus J-K relationship (see Shields et al. 2018). This system has J-Ks~2.1 and Gaia BP-RP~3.8 (Cutri et al. 2012, Gaia Collaboration et al. 2020). Most known RCBs lie on or above the locus of carbon stars in BP-RP versus J-K. The colors for this system fall within the expected color ranges for typical RCB systems.
Further photometric and spectroscopic observations are encouraged.
We 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 to the Ohio State University, NSF grant AST-1908570, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Chinese Academy of Sciences South America Center for Astronomy (CASSACA). For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients. | 2021-09-08 22:43:00 | optical,star,transient,variables | 2021-09-08 | 22:43:00 | 2,329 | [
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] | 14,902 |
14,905 | Spectroscopic Classifications of Optical Transients with the Lick Shane telescope | K. Davis, 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 ATLAS and ZTF. All observations were made on 2021 Sep 5 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. | 2021-09-09 07:58:00 | optical,supernovae,transient | 2021-09-09 | 07:58:00 | 467 | [
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] | 14,903 |
14,906 | Shocked plasma in X-ray grating spectra of RS Oph | M. Orio (INAF-Padova and University of Wisconsin), E. Behar (Technion), J. Drake (Center for Astrophysics), J. Mikolajewska (Nicolaus Copernicus Astronomical Center), J. U. Ness (ESA-ESAC), N. Ospina (INFN and Padova University) | We report on X-ray grating observations of RS Oph done on 2021 August 27 with the Chandra High Energy X-ray Gratings (HETG) and ACIS camera, and on 2021 August 30 with the XMM-Newton Reflection Grating Spectrographs (RGS). The first was obtained in a continuous exposure of 29 kiloseconds, and the second in a continuous exposure of 54 kiloseconds. The dates correspond to approximately day 20 and day 23 after the optical maximum. There were no flares and no large count rate variations in the 0.4-10 keV of the HETG exposure on the first date, neither on the second date in the energy range 0.35-2.5 KeV of the RGS or of the XMM-Newton EPIC cameras (0.15-12 keV for EPIC-pn and 0.3-12 keV for the EPIC MOS). Both grating spectra showed strong emission lines and no luminous supersoft component, which was also not present in the XMM-Newton EPIC cameras on August 30. On August 27 we measured H-like and He-like emission lines of calcium, argon, magnesium and neon and other lines of silicon and iron (Fe XXVI, Fe XXV, Fe XVIII, Fe XVII). The sensitivity of the setup with the ACIS camera, however, is quite reduced above about 20 Å (0.62 keV), so we do not rule out emission lines at higher wavelengths. On August 30 we also detected H-like and He-like lines of aluminum, oxygen and nitrogen, but almost no emission at wavelengths above 30 Å (0.41 keV). The August 27 HETG spectrum can be fitted with two components of collisionally ionized plasma in thermal equilibrium with plasma temperature of 2.2 keV and 0.7 keV respectively, and absorbing column density of 8.7 x 1021 cm-2. The August 30 RGS spectrum indicates cooling, and probably decreased column density (best fit with 7.4 x .1021 cm-2). It requires at least three components to be fitted, with a highest temperature of only about 0.8 keV. Like in the early X-ray grating spectra of 2006, in the HETG spectrum of August 27 asymmetric line profiles indicate that the redshifted material moving away in the line of sight is increasingly more absorbed than the material moving towards us. The spectra have clear similarities with X-ray grating spectra obtained in the 2006 outburst on days 14 and 26 after the optical maximum, although on day 26 a large soft flare was observed during the exposure. A new XMM-Newton exposure is currently scheduled on 2021 September 15. | 2021-09-11 02:18:00 | optical,x-ray,nova | 2021-09-11 | 02:18:00 | 2,329 | [
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] | 14,904 |
14,907 | Fermi GBM observation of a bright flare in the direction of SGR 1935+2154 | Roberts, O. J. (USRA/NASA-MSFC) and Wood, Joshua (USRA/NASA-MSFC) | At 00:45:46.94 UT on 10 September 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located a bright, SGR-like flare from the direction of the magnetar SGR 1935+2154 (trigger 652927551/210910032). The flare was also observed by Konus Wind (Ridnaia et al., GCN 30804) and triangulated to an annulus incorporating the SGR position by the IPN (Ridnaia et al., GCN 30803). The on-ground calculated location using the Fermi GBM trigger data, is consistent with the known position of the SGR and the IPN localization. The angle from the Fermi LAT boresight at the GBM trigger time is 102 degrees. The burst has a duration (T90) of about 1.4 s (10-1000 keV). It is best fit by a double-blackbody model with temperatures of kT1 = 8.51 +/- 0.08 keV and kT2 = 16.55 +/- 0.18 keV. The event fluence (10-1000 keV) from T0-0.064s to T0+1.328s is (3.858 +/- 0.011)E-05 erg/cm^2. The average photon flux in the 10-1000 keV band during this period is 522.7 +/- 1.5 ph/s/cm^2. Fermi GBM has also triggered on 14 other bursts from the direction of SGR 1935+2154 over the last 4 days, indicating it has entered a stage of heightened activity in this latest outburst: Date and Time in UTC Fermi MET (s) 2021-09-06T01:44:30.10 652585475 2021-09-09T18:57:14.86 652906639 2021-09-09T20:21:28.37 652911693 2021-09-10T00:45:46.94 652927551 2021-09-10T01:00:43.71 652928448 2021-09-10T01:13:17.40 652929202 2021-09-10T01:27:05.60 652930030 2021-09-10T02:21:06.44 652933271 2021-09-10T02:36:38.24 652934203 2021-09-10T02:55:10.17 652935315 2021-09-10T05:35:55.51 652944960 2021-09-10T09:12:48.91 652957973 2021-09-10T15:50:56.89 652981861 2021-09-10T23:40:34.46 653010039 The spectral analysis results presented above are preliminary. We encourage multi-wavelength observations to follow-up this most recent activation. For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/" | 2021-09-11 08:15:00 | gamma ray,gamma-ray burst,magnetar,soft gamma-ray repeater | 2021-09-11 | 08:15:00 | 1,994 | [
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] | 14,905 |
14,908 | VLITE Detection of the 2021 Outburst of the Recurrent Nova in RS Ophiuchi | W. M. Peters (NRL), T. E. Clarke (NRL), S. Giacintucci (NRL), N. E. Kassim (NRL), E. Polisensky (NRL) | We report observations of the recurrent nova RS Ophiuchi (AAVSO Alert Notice 752) with the VLA Low-band Ionospheric and Transient Experiment (VLITE). VLITE is a commensal instrument which records data from 18 antennae in a 34 MHz band at a central frequency of 338 MHz during all routine Karl G. Jansky Very Large Array (VLA) observations. Results from the GHz-frequency VLA follow up of RS Ophiuchi have been previously reported (ATEL #14886). The nova is not visible in VLITE data from 2021-08-18, with an upper limit on the peak flux of 12.5 mJy/bm. In observations from 2021-08-20 (t0 + 11.5d), the source is seen with a flux of 16.1 ± 4.1 mJy/bm. Two weeks later, on 2021-09-04 (t0 + 26.5d), the flux density had risen to 58.7 ± 12.2 mJy/bm. An additional measurement from 2021-09-06 (t0 + 28.5d), has a similar flux density of 58.0 ± 13.5 mJy/bm. The flux density scale has been calibrated to 3C286, and the measurement uncertainty includes VLITE's 15% flux density calibration accuracy and the fit errors summed in quadrature. The data were taken with the VLA in its relatively compact C-configuration (maximum baseline of 3.4 km), and the resolution is approximately 45 arcsec. The source is unresolved. Ongoing VLA observations to monitor the source at higher frequencies will allow VLITE to continue to track the outburst as well. | 2021-09-11 09:21:00 | radio,nova,transient | 2021-09-11 | 09:21:00 | 1,340 | [
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] | 14,906 |
14,909 | Intermediate resolution spectroscopic follow-up observation around H-alpha of the 2021 outburst of the recurrent nova RS Oph | M. Fajrin, Irfan Imaduddin, Hakim L. Malasan (Institut Teknologi Bandung), Akira Arai (Subaru Telescope, National Astronomical Observatory of Japan), Yoshiharu Shinnaka, Hideyo Kawakita (Koyama Astronomical Observatory, Kyoto Sangyo University) | We report a summary of our intermediate-resolution spectra of RS Oph taken firstly on 2021 Aug. 10.5690 UT and consecutively over 16 nights using the LHIRES III spectrograph (1200 grooves/mm grating) equipped with an ST402ME CCD camera. The units are attached to a 10-inch LX-200R Meade telescope (f/10) at Bosscha Observatory of Institut Teknologi Bandung. The standard star HR 7001 was observed to calibrate flux. As had been predicted in ATel#13810, the first outburst since 2006 of the recurrent nova RS Oph has just occurred. It was discovered and reported to vsnet-alert by Keith Geary ([vsnet-alert 26131]). Also, the Large Area Telescope (LAT) on the Fermi Gamma-ray space telescope discovered it independently (ATel#14834). Follow-up low-resolution spectroscopy using the 3.8 m Seimei telescope was reported by Taguchi et al. (ATel#14838). Our spectra (Δλ of 260 Å) taken with a resolution λ/Δλ ～ 5000 show broad emission upon which a blue-shifted absorption line (Δ v = -40.272 ± 2.202 km/s on Aug. 10.5690 UT) of H-alpha can be clearly seen. The velocity of the broad Hα emission line is estimated to be around 2800 km/s. The profile and velocity indicate that this outburst is indeed a nova eruption, as is expected. The broad emission line indicates the presence of another shell expanding with high velocity. We measured and determined expansion velocities either from broad emission line and P-Cygni profile, and present herewith the variation in expansion velocities. The expansion velocity smoothly decreased, which is consistent with the 2006 outburst (e.g. Mondal et al. 2018 MNRAS, 474, 4211 and references therein.) The nova is thought to enter the nebular phase, as can be seen from the low-resolution spectra λ/Δλ ～ 1000 observed from ITERA Astronomical Observatory on 2021 Aug 16.746 UT by I. Hafizah and Aditya A. Yusuf using the Lisa Pack spectrograph equipped with an ATIK 314 L CCD camera. The units are attached to a 10-inch GCR Astrograph telescope (f/8). Our spectra and measurement results can be seen from the Optional Link URL. | 2021-09-12 03:55:00 | optical,gamma ray,nova,star | 2021-09-12 | 03:55:00 | 2,061 | [
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] | 14,907 |
14,910 | Further Infrared Spectroscopy of RS Oph on day +34 reveals Coronal Line Emission | C. E. Woodward (U. Minnesota), D. P.K. Banerjee (PRL, India), A. Evans (Keele U., UK), S. Starrfield (Arizona State U.), R. M. Wagner (Ohio State U.), R. D. Gehrz (U. Minnesota) | Low resolution (R = 1200) near-infrared (0.70 to 2.54 micron) spectroscopy of RS Oph (ATEL#14909, #14908, #14906, #14901, #14883, #14881 among others) obtained with SpeX (Rayner et al. 2003, PASP 115, 362) in short crossed-dispersed (SXD) mode on 2021 Sept 11.221 UT (approximately day +34 after eruption) on the NASA IRTF 3.2-m under good sky conditions (seeing 0.6 arcsec in the K-band) show that infrared coronal line emission (see Benjamin and Dinerstein 1990, AJ 100, 1588; Greenhouse et al. 1998, ApJ 352, 307) is now evident. In addition, the FWHM of the hydrogen emission lines are narrowing, and the red-wing asymmetries and saddle-shaped line profile peaks are disappearing (see ATEL#14866). The broad, blended emission complexes seen on day+12 (ATEL# 14866) now are resolving into individual line components, and multiple He II emission lines are now strong. Infrared coronal lines present, and representative observed fluxes (erg/s/cm2) include [S VIII] 0.9914 micron (2.8e-11), [S IX] 1.253 micron (3.4e-11), [Si X] 1.4305 micron (2.5e-11), [Si VI] 1.9650 micron, and [Si VII] 2.4833 micron (1.4e-11), with all wavelengths in vacuum. Also present is the line emission feature at 2.090 micron whose identification remains elusive. These latter detections substantiate reports of the detection of [Ne V] 0.3427 micron and coronal [FeX] 0.6375 micron lines by Munari et al. (ATEL#14895) just prior to the onset of the super-soft source (SSS) x-ray phase near 2021 September 04, as communicated by Page et al. (ATEL#14894) based on Neil Geherls SWIFT XRT observations. Currently, at the epoch of these latest SpeX observations discussed herein, the FWHM of the H emission lines (derived from the Br-series 19 to 9 lines in the H-band) exhibit an average velocity of 610 km/s. The observed fluxes (gaussian fit, erg/s/cm2) of Pa-β and Br-γ are 3.6e-10 and 6.5e-11, respectively while that of He I 10830 is 2.1e-9. Interestingly, the 12C16O band heads from 2.29 micron onwards, arising from the red giant secondary, are being detected very much earlier than in the 2006 outburst (they were not seen even on day 55; Evans et al. 2007, MNRAS 374, L1). We are examining whether the approximately 0.5 difference in the orbital phase of the red giant between the 2006 and 2021 eruptions (estimated using the ephemerides of Brandi et al. 2009, A&A 497, 815), could be responsible for the early appearance of the CO features in the current outburst. Clearly further infrared spectroscopic observations are encouraged.
The investigators are grateful to the NASA IRTF for providing the quick-access DDT opportunity (2021B996), and we thank the observatory staff for their assistance. | 2021-09-13 03:37:00 | infra-red,x-ray,nova | 2021-09-13 | 03:37:00 | 2,682 | [
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] | 14,908 |
14,911 | NICER observations during the rise and extended bright phase of the current giant outburst of EXO 2030+375 | P. Thalhammer (Remeis-Observatory & ECAP, FAU Erlangen-Nuremberg), 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 system EXO 2030+375 is currently undergoing its first giant outburst since 2006 (ATEL #14809). We report on the results of recent NICER observations of EXO 2030+375, performed during the rise of the outburst and its current extended bright phase, NICER started monitoring on 28 July 2021, with daily monitoring starting 24 August 2021. Until 2 September 2021 it has accumulated a total exposure of 35 ks.
The 0.5-10 keV flux initially rose from 1.3e-09 erg/cm^2/s to 5.7e-09 erg/cm^2/s on 24 August 2021. Since then the flux of EXO 2030+375 remained on a high level with only slight variations.
The spectrum of these observations can be described by a partially absorbed powerlaw with a weak blackbody component and a narrow iron emission line. Weak residuals around 2 keV are detected that might be calibration artifacts due to the quick-look nature of the data. A detailed investigation is ongoing.
During the rise of the outburst the spectral shape changed notably. The spectrum in the NICER energy band became softer with the photon index increasing from 1.048(22) to 1.460(6), while the black-body temperature decreased from 175(10) eV to 87.5(27) eV. The equivalent hydrogen column density remained constant during all observations, with NH of 3.0--3.2*10^22 cm^-2, a typical value for this source. During the later phase, the overall spectral shape remained remarkably constant except for slight flux changes.
In all observations strong pulsations with a period of ~41.3 s are present. At low fluxes, early in the outburst the pulse profiles are complex and triple-peaked, but constant with energy. During the extended high-flux period later in the outburst the pulse profile becomes simpler and is more clearly dominated by a single peak.
NICER, as well as Swift/XRT, will continue monitoring the giant outburst of EXO 2030+375 in the soft X-ray band. Further observations of this rare phenomenon, in particular in other wavebands, are encouraged. | 2021-09-13 05:51:00 | x-ray,binary,neutron star,pulsar,star,transient | 2021-09-13 | 05:51:00 | 1,980 | [
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] | 14,909 |
14,912 | MAXI/GSC detection of renewed activity from XTE J1908+094/MAXI J1909+094 | K. Kobayashi, H. Negoro (Nihon U.), S. Ogawa (Kyoto U.), M. Nakajima, K. Asakura, K. Seino (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, K. Komachi, 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. Ishikawa, M. Tominaga, T. Nagatsuka, T. Omama, M. Kurihara (JAXA), Y. Ueda, S. Yamada, K. Setoguchi, T. Yoshitake, Y. Goto, R. Uematsu (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) report on behalf of the MAXI team | The MAXI/GSC nova alert system triggered on a hard X-ray transient source at 20:11 on September 12, 2021. Assuming that the source flux was constant over eleven scan transits from 12:26 on September 12 to 3:56 on September 13, we obtain the source position at (R.A., Dec) = (287.424 deg, 9.427 deg) = (19 09 41, +09 25 37) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.33 deg and 0.2 deg, respectively. The roll angle of the long axis from the north direction is 38.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scans was 43 +/- 6 mCrab (4.0-10.0keV, 1 sigma error). The X-ray activity started on September 12, and the X-ray flux changes largely on timescales of hours. The error region includes the microquasar XTE J1908+094 discovered in 2002 (In't Zand, et. al, IAUC 7873 ). Outbursts from XTE J1908+094 were observed in 2013 (ATel #5523, #5549) and in 2019 (ATel #12628, #12632, #12652). The Swift/BAT light curve of XTE J1908+094, however, does not shows any significant activity, yet (https://swift.gsfc.nasa.gov/results/transients/weak/XTEJ1908p094/). Thus, we also tentatively name the source MAXI J1909+094. Followup observations are encouraged to identify this source. | 2021-09-13 23:02:00 | x-ray,black hole,nova,transient | 2021-09-13 | 23:02:00 | 1,317 | [
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] | 14,910 |
14,913 | H-alpha observations of M31 candidate nova AT2021ypn | A. Valcheva (Sofia University, Bulgaria), M. Minev (Sofia University; IA and NAO, BAS, Bulgaria), E. Ovcharov (Sofia University, Bulgaria), A. Vinokurov (SAO RAS), P. Nedialkov (Sofia University, Bulgaria) | We report strong H-alpha emission of M31 nova candidate AT 2021ypn (= PSP21H) discovered on 2021/09/11.602 UT by Xingming Observatory Sky Survey (XOSS).
H-alpha observations were taken on 2021 Sept 11.914 UT with the FoReRo2 focal reducer at the 2m RCC telescope at the NAO Rozhen, Bulgaria. The transient H-alpha magnitude is 15.71 ± 0.03 mag obtained from 3x300 sec co-added CCD frames. Magnitudes in B and R standard filters are also available, respectively, 16.79 ± 0.02 mag (5x240 sec; 2021 Sept 11.909 UT) and 16.39 ± 0.01 mag (5x120 sec; 2021 Sept 11.905 UT). H-alpha and R-band images can be found here.
The H-alpha brightness of the transient strongly supports its classification as nova. | 2021-09-14 04:36:00 | optical,nova,transient | 2021-09-14 | 04:36:00 | 699 | [
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14,914 | Swift follow-up observations of the flaring millimeter-band source SPT-SJ010023-4357.1 | Marcos Santander (UAlabama), Greg Sivakoff (UAlberta), Nathan Whitehorn (MSU), RileyAnne Sharpe (UAlabama) | The Neil Gehrels Swift Observatory performed follow-up observations of the flaring mm-band point source reported by SPT-3G in ATel #14875 on Aug 26, 2021. Swift observations were scheduled between Sept 2 and Sept 9, accumulating a total exposure of 1.2 ks over three epochs.
The observations collected with the Swift X-ray Telescope (XRT) in photon-counting mode were analyzed to characterize the emission state of the candidate counterpart to the mm-band transient. No new X-ray source was detected in the error region of the mm source, or emission from the candidate counterpart suggested in ATel #14875, the X-ray source XMMSL2 J010025.1-435716, also catalogued as WISEA J010025.17-435713.5. We therefore place a 3-sigma upper limit on the X-ray count rate for this previously detected X-ray source of < 0.017 cts/s in the 0.3-10 keV band, which corresponds to a flux of 7.1 x 10^-13 erg cm^-2 s^-1 assuming an absorbed power-law spectrum with photon index of 1.7 and Galactic n_H = 1.76 x 10^20 cm^-2. This upper limit is a factor of ~2.4 lower than the flux value reported in the XMMSL2 catalog of (1.73 +/- 0.85) x 10^-12 erg cm^-2 s^-1 in a similar energy band (0.2-12 keV).
Optical/UV observations were collected simultaneously with the Swift UV/Optical Telescope (UVOT) in three bands: U, W1, and W2. The only UVOT detection consistent with the position of the mm source was that associated with XMMSL2 J010025.1-435716. We found no evidence of UV/optical variability for this source, with the fluxes in each band being consistent within uncertainties over the three epochs. The UVOT flux levels are also consistent with archival GALEX observations obtained from NED.
The average flux for each band is listed below. These values have been corrected for Galactic extinction using IRSA tables and R_lambda values calculated using the York Extinction Solver.
Band Flux U (5.1 +/- 0.5) x 10^-13 erg cm^-2 s^-1 W1 (6.7 +/- 0.6) x 10^-13 erg cm^-2 s^-1 W2 (8.0 +/- 0.7) x 10^-13 erg cm^-2 s^-1
The rising optical/UV flux in nu F_nu can be interpreted as a synchrotron component peaking above the UV range (> 10^15 Hz), which would also be consistent with the SPT-3G flux values, although the X-ray upper limit constrain synchrotron peak values to be between ~10^15 and ~10^17 Hz in this scenario.
As no new sources were detected in the X-ray or UV/optical bands in the error region of SPT-SJ010023-4357.1, the source XMMSL2 J010025.1-435716 remains as its most likely candidate counterpart.
We wish to thank the Swift Team for making these observations possible, in particular J. Kennea as the Swift Observatory Duty Scientist and Brad Cenko for approving our request for follow-up observations. | 2021-09-14 06:26:00 | millimeter,optical,ultra-violet,x-ray,agn,transient | 2021-09-14 | 06:26:00 | 2,705 | [
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14,915 | Radio observations of SN 2021yja | S. D. Ryder (Macquarie University), L. Marnoch (Macquarie University), E. Kundu (Michigan State University), M. D. Filipovic (Western Sydney University), R. Alsaberi (Western Sydney University), G. Anderson (ICRAR/Curtin University), C. Stockdale (Marquette University), K. Maeda (Kyoto University), M. Renaud (LUPM, CNRS/IN2P3), R. Kotak (University of Turku) | The young core-collapse supernova SN 2021yja (=ATLAS21bidw; TNS AstroNote 2021-235) in NGC 1325, originally classified as a type II event and recently suggested to be a type Ic SN, has been observed with the Australia Telescope Compact Array (ATCA) at 5.5 and 9.0 GHz on 9 Sep 2021 20:00-23:00 UT, and at 18 GHz on 11 Sep 2021 19:30-20:30 UT. No radio emission was detected at the reported location, to 3-sigma upper limits on flux density of 0.04 mJy, 0.03 mJy, and 0.05 mJy at 5.5 GHz, 9.0 GHz, and 18 GHz, respectively. Adopting the host galaxy distance as 22 Mpc from the NASA Extragalactic Database (NED) this implies upper limits on the 5.5 GHz and 18 GHz luminosities within 4 days of explosion of 2.3E+25 erg/sec/Hz and 2.9E+25 erg/sec/Hz, respectively. 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. | 2021-09-14 06:51:00 | radio,supernovae | 2021-09-14 | 06:51:00 | 1,098 | [
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] | 14,913 |
14,916 | Follow-up observations of SGR 1935+2154 with NICER | Tolga Guver (Istanbul Univ.), Chin-Ping Hu (NCUE), George Younes (NASA/GSFC/USRA), Zorawar Wadiasingh (NASA/GSFC/University of Maryland College Park), Chryssa Kouveliotou (George Washington University), K. C. Gendreau, Z. Arzoumanian (NASA/GSFC) | Following the reports of bursting activity from SGR 1935+2154 (ATel #14907, GCN 30806, 30804, 30803, 30797), we observed the source with The Neutron star Interior Composition Explorer (NICER) on 2021 September 11 and 12 with a total exposure time of 4009 s.
In these observations, we detected 20 burst candidates with significance higher than 5 sigma through the Bayesian block technique. The durations are between milliseconds to ~2 seconds. A burst with the highest fluence is detected at 2021-09-11 23:55:45.872 (UTC). It has a peak count rate of 2.6E4 counts/s and a fluence of (3.9 +/-0.1) x 10^-8 erg/cm^2.
We also extracted an X-ray spectrum of the persistent emission from the source, after filtering out the burst intervals. The resulting spectrum (exposure time of 3750 s) was binned to 50 counts per channel and fit in the 1-6 keV range with an absorbed blackbody plus a power-law model (chi2/d.o.f. = 0.7 for 104 d.o.f.). Interstellar absorption is taken into account using the âtbabsâ model with ISM abundances (Wilms et al. 2000; ApJ, 542, 914) and is fixed to N_H = 2.4E22 cm^-2 following Younes et al. (2020; ApJ, 904L, 21Y). The best fit blackbody temperature and emitting area are found to be kT = 0.51 +/- 0.02 keV and R ~ 2.6 km, respectively with a power-law photon index of \Gamma=0.98+/-0.29. The unabsorbed 0.5 - 10 keV flux of the source is 1.75 +/- 0.05 x10^-11 ergs/cm^2/s, which is about an order of magnitude larger than the source quiescent flux level. This implies that the source is undergoing yet another outburst, with a flux enhancement comparable to the one measured after the April 2020 major outburst.
SGR 1935+2154 continues to be active and showing bursts at various intensities; further NICER observations are planned.
NICER is a 0.2-12 keV X-ray telescope operating on the International Space Station. The NICER mission and portions of the NICER science team activities are funded by NASA. | 2021-09-14 17:18:00 | x-ray,magnetar,neutron star,star | 2021-09-14 | 17:18:00 | 1,939 | [
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] | 14,914 |
14,917 | Apparent Outburst of Comet C/2014 UN271 (Bernardinelli-Bernstein) | Michael S. P. Kelley (U. Maryland), Tim Lister (Las Cumbres Observatory), Carrie E. Holt (U. Maryland), on behalf of the LCO Outbursting Objects Key Project | We report an apparent outburst of comet C/2014 UN271 (Bernardinelli-Bernstein), as seen in Las Cumbres Observatory 1-m telescope data. Following our initial observations (Kokotanekova et al. 2021, ATEL #14733), the comet had faded in brightness to r=19.57+/-0.04 mag, measured within a 4" radius aperture on 2021 Sep 09.103 UTC and calibrated to the PS1 magnitude system. In our next data taken 2021 Sep 09.924 UTC the comet had brightened to r=18.92+/-0.04 mag, a difference of -0.65+/-0.06 mag. No background source is visible at the comet's coordinates in Digitized Sky Survey images. The brightening is confirmed in subsequent data taken 2021 Sep 11.335 UTC, r=19.02+/-0.04 mag. On Sep 09, the comet was 19.89 au from the Sun, 19.44 au from the Earth, and at a phase angle of 2.6 deg.
This work makes use of observations from the Las Cumbres Observatory global telescope network. | 2021-09-15 01:46:00 | optical,comet,the sun | 2021-09-15 | 01:46:00 | 884 | [
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] | 14,915 |
14,918 | Fermi-LAT detection of enhanced/renewed gamma-ray activity from the FSRQ blazars PKS 0301-721 and PKS 0920-39 | P. V. Van Zyl (South African Radio Astronomy Observatory (SARAO)), J. Valverde (UMBC/NASA GSFC), 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 increased gamma-ray flux from a source positionally consistent with the flat spectrum radio quasar PKS 0301-721 (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).
Preliminary analysis indicates that on 2021 September 10, PKS 0301-721 was in an active state reaching a daily averaged gamma-ray flux (E>100 MeV) of (1.0+/-0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only), about 100 times greater than its ten-year average flux reported in the fourth Fermi-LAT source catalog data release 2 (4FGL-DR2; Ballet et al., arXiv:2005.11208). The corresponding daily averaged spectral photon index (E>100 MeV) of 2.1+/-0.1 (statistical uncertainty only) is smaller than the 4FGL-DR2 catalog value of 2.5+/-0.1. The peak flux is detected in the 4th 6-hour run interval of September 10 with a 6-hour averaged gamma-ray flux (E>100 MeV) of (1.2+/-0.3) X 10^-6 photons cm^-2 s^-1, and corresponding spectral photon index (E>100 MeV) of 2.0+/-0.2. GeV gamma-ray activity of PKS 0301-721 has been previously announced once in 2020, by the Fermi LAT Collaboration (ATel#14293).
Also on September 10, the LAT has observed enhanced gamma-ray flaring activity from a source positionally consistent with the flat spectrum radio quasar PKS 0920-39 (4FGL J0922.7-3959; The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 140.55 deg and Decl. = -39.70 deg (J2000, Johnston et al. 1995, AJ, 110, 880), and redshift z=0.591 (Hewitt and Burbidge 1989, ApJS, 69, 1). Preliminary analysis indicates that on 2021 September 10, PKS 0920-39 was in a flaring state with a daily averaged gamma-ray flux (E>100MeV) of (1.0+/-0.2) X 10^-6 photons cm^-2 s^-1, which corresponds to a flux increase factor of 50 times the ten-year average flux reported in the 4FGL-DR2 catalog of 2.1 X 10^-8 photons cm^-2 s^-1. This daily flux has been previously observed for this source in ATel#5326 and we suspect this might be a renewed flare. The corresponding photon index is 2.4+/-0.2, and is moderately smaller than the 4FGL value of 2.6+/-0.1. The peak flux is detected in the 3rd 6-hour interval of September 10 between 12:00 and 18:00 UT with a 6-hour averaged gamma-ray flux (E>100 MeV) of (2.1+/-1.0) X 10^-6 photons cm^-2 s^-1, and corresponding spectral photon index (E>100 MeV) of 2.6+/-0.6.
PKS 0920-39 is included in the list of publicly monitored sources found at the Fermi Science Support Center. PKS 0301-721 is still in the process of being added to the monitored sources list. Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of these sources will continue. In consideration of the ongoing activity of this source, we encourage multiwavelength observations. For these sources, 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. | 2021-09-15 03:33:00 | radio,gamma ray,agn,blazar,quasar,request for observations | 2021-09-15 | 03:33:00 | 3,397 | [
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] | 14,916 |
14,919 | Spectroscopic confirmation and photometry of the nova candidate AT2021ypn | A. Vinokurov, S. Fabrika, A. Sarkisyan, Yu. Solovyeva, A. Grokhovskaya (SAO RAS), A. Valcheva, P. Nedialkov (Sofia University, Bulgaria) | We report the optical spectroscopic confirmation of the recent M31 nova candidate AT2021ypn (= PSP21H) discovered on 2021/09/11.602 UT by Xingming Observatory Sky Survey (XOSS). The spectrum was obtained on 2021-14-01.625 UT using the Russian 6m telescope (BTA) equipped with the SCORPIO-2 spectrograph, with spectral resolution of 4.5 Å in the 3650-7250 Å range. | 2021-09-15 04:57:00 | optical,nova,transient | 2021-09-15 | 04:57:00 | 363 | [
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] | 14,917 |
14,920 | Swift observations identified the X-ray transient MAXI J1909+094 as 4U 1907+09 | H. Negoro (Nihon U.), J. A. Kennea (PSU) and P. A. Evans (U Leicester) | Following the possible detection of new activity in XTE J1908+094 by MAXI (ATel #14912), NICER made an observation of XTE J1908+094 at 14:39 on DOY 246 (September 13) of 2021. NICER found no X-ray flux of XTE J1908+094. The visibility windows for this part of the sky for NICER at that time were too short for NICER to execute a raster scan, so Swift observations were requested. The 4 tiling observations with 500 sec each to cover the MAXI error region were performed from 20:56 UT on September 13. Only the supergiant HXMB 4U 1907+09 was detected in the FOVs, and XTE J1908+094 was below the detection limit. The XRT observation revealed significant variability in 4U 1907+09 which is typical in this source, and also consistent with that seen in the MAXI data. Thus, we conclude that the MAXI transient is 4U 1907+09. 4U 1907+09 is out of the MAXI error region but inside it if the systematic error is taken into account. In MAXI data analysis, each X-ray photon is assumed to come from the center of the FOV with +/- 1.5 degree in the scan direction, and the source position is determined assuming that the source flux is constant during scans for multiple scans data. This time, SFXT-like activity and/or pulsations during some scans may cause an artificial large offset from the true source position, and result in the mis-identification. The MAXI team thanks the NICER team, especially K. Gendreau, for the prompt scheduling and sharing the result. | 2021-09-15 21:26:00 | x-ray,transient | 2021-09-15 | 21:26:00 | 1,456 | [
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] | 14,918 |
14,921 | Johnson and SDSS photometry of SN2021wuf (ATLAS21bgsc) | J. Vannini (Asociacion Nicaraguense de Astronomos Aficionados), J. Ricra (Observatorio AFARI) and N. O. Baella (Instituto Geofisico del Peru) | We report standard photometric measurements of SN2021wuf (ATLAS21bgsc) obtained ~14d after its discovery and very close to its maximum brightness (see ObSN database). SN2021wuf was discovered on August 23, 2021 by Srivastav et al. 2021 and Tonry et al. 2021, and it would be associated with the galaxies NGC 6500 or 6501 (both at z = 0.01). It has been classified as a Type Ia supernova by Huber et al. 2021 (TNS Classification Report No 10585).
The images were obtained on September 6, 2021 from the Teide Observatory, Canarias (Spain) using a LCOGT 0.4m robotic telescope, a CCD SBIG STL-6303E camera and Johnson (V and B) and SDSS (r' and i') filters. A total of 32 images were obtained (8 in each filter) with exposure times of 300s (B), 100s (r') and 200s (V and i'), under an airmass range of 1.02 to 1.38. The equations described by Harris et al. 1981 and APASS DR10 catalog (Henden et al. 2018) were used for the photometric calibration process.
Table 1 shows the values obtained (without reddening correction), in addition an image of the observed field can be seen here.
This work makes use of observations from the Las Cumbres Observatory global telescope network.
Table 1 DATE-OBS (UT) HJD Filter Mag 2021-09-06T21:40:52 2459464.40447 V 14.01+/-0.07 2021-09-06T21:45:24 2459464.40762 B 14.23+/-0.04 2021-09-06T21:49:04 2459464.41016 r' 14.0+/-0.2 2021-09-06T21:51:54 2459464.41213 i' 15.3+/-0.2 | 2021-09-16 13:34:00 | optical,supernovae | 2021-09-16 | 13:34:00 | 1,410 | [
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] | 14,919 |
14,922 | Pre-discovery detection of the M31 nova AT 2021ypn | K. Sarneczky, A. Horti-David, J. Vinko, Cs. Kalup (Konkoly Observatory) | We report pre-discovery detection of the M31 nova AT 2021ypn (PSP21H) discovered by the Xingming Observatory Sky Survey (XOSS) on 2021-09-11.602 UT and classified as a nova by Valcheva et al. (ATel #14913) and Vinokurov et al. (ATel #14919). AT 2021ypn was first detected on the unfiltered, co-added frames (exposure time 15x60 sec) taken with the 10560x10560 STA 1600LN CCD on the 0.6/0.9m Schmidt telescope at Piszkesteto Station of Konkoly Observatory, Hungary, at 2021-09-10.968 UT, ~15.2 hours before discovery. Image subtraction using a template frame taken on 2020-10-22 has been applied before detection. The last non-detection with the same setup occurred at 2021-09-10.09 UT, ~21.07 hours before our first detection. The nova appeared 0.6 (unfiltered) mag fainter at 2021-09-10.97 UT than 1 day later, at 2021-09-11.9 UT, close to the discovery date. Using the R-band photometry of Valcheva et al. (ATel #14913) we estimate the pre-discovery brightness of AT 2021ypn as R ~ 17.0 +/- 0.1 mag. | 2021-09-18 04:25:00 | optical,nova | 2021-09-18 | 04:25:00 | 1,001 | [
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14,923 | Fermi-LAT detection of a new gamma-ray source associated with the FSRQ B3 0251+39 | I. Mereu (INFN Perugia) 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 gamma-ray emission from a source positionally consistent with the flat spectrum radio quasar B3 0251+39, also known as 5BZQ J0254+3931, with coordinates R.A. = 43.6776337 deg, Decl. = +39.5263086 deg (J2000; Beasley et al., 2002, ApJS, 141, 13), and redshift z=0.289 (Marcha et al, 1996 ,MNRAS, 281, 425). This source is not in any published LAT catalog and was not detected by AGILE or EGRET.
Preliminary analysis indicates that this source was significantly detected (>5 sigma) in a high gamma-ray state on September 13, 2021, with a daily averaged gamma-ray flux (E>100MeV) of (0.25 +/- 0.09) X 10^-6 photons cm^-2 s^-1 and a single power-law photon index of 2.1 +/- 0.2 (statistical uncertainties only).
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. | 2021-09-18 04:33:00 | radio,gamma ray,agn,blazar,quasar,transient,request for observations | 2021-09-18 | 04:33:00 | 1,364 | [
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14,924 | Swift detects a bright flare from IGR J16418-4532 | B. Sbarufatti (INAF-OAB/PSU), P. Romano (INAF-OABrera), S. D. Barthelmy (GSFC), H. A. Krimm (CRESST/GSFC/USRA), P. A. Evans (U Leicester), J. A. Kennea (PSU), K. L. Page (U Leicester), M. H. Siegel (PSU) | The Swift Burst Alert Telescope (BAT) triggered on the high mass X-ray binary IGR J16418-4532 on 2021 September 18 at07:58:20 UT (image trigger 1073821). Swift immediately slewed to the target.
Using the BAT data set from T-239 to T+963 sec from the recent telemetry downlinks, we report that the time-averaged spectrum from T+0.00 to T+64.00 sec is best fit by a simple power-law model with a photon index of 2.95 +/- 0.43. The fluence in the 15-150 keV band is (4.0 +/- 0.9)E-07 erg cm-2. All quoted errors are at the 90% c.l.
The XRT began observing the field at 08:00:34 UT, 134 s after the BAT trigger. The XRT light curve shows the descending part of a flare that exceeded 30 counts s-1 and decays down to 0.1 counts s-1 in about 17 ks. The mean XRT/WT spectrum (first orbit of data, exposure 799 s) can be fit by an absorbed power-law model with a photon index of 1.72 (+0.11, -0.11) and an absorbing column density of NH=(7.7+0.5-0.5)E22 cm-2. The average 0.3-10 keV observed (unabsorbed) flux is 1.4E-9 (3.5E-9) erg cm-2 s-1, making this one of the brightest states observed by XRT. The mean XRT/PC spectrum (orbits second to fourth, 3.9 ks exposure) can be fit by an absorbed power-law model with a photon index of 0.98 (+0.28, -0.27) and an absorbing column density of NH=(5.5+1.2 -1.0)E22 cm-2. The average 0.3-10 keV observed (unabsorbed) flux is 8.0E-11 (1.2E-10) erg cm-2 s-1.
Previously, Swift observed bright flares from this source on 2011 February 17 (Romano et al., 2012, MNRAS, 419, 2695), 2012 June 3 (Romano et al., 2012, ATel #4148), 2013 April 2 (Romano et al., 2012, ATel #4939), 2013 September 19 (Krimm et al., 2013, ATel #5398), and 2015 April 27 (Romano et al., 2015, ATel #7454).
The historical light curve from the BAT hard X-ray transient monitor (Krimm et al, 2013, ApJS, 209, 14; 15-50 keV) can be found at http://swift.gsfc.nasa.gov/docs/swift/results/transients/weak/IGRJ16418-4532 . | 2021-09-19 08:11:00 | x-ray,binary,neutron star,star,transient | 2021-09-19 | 08:11:00 | 1,924 | [
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14,925 | Classification of 11 supernovae by DEBass | C. Lidman, S. Dhaka, M. Hall, M. Melton, E. Muller, M. Ireland, R. Sharp, H. Abbot, P. Armstrong, G. Taylor, B. E. Tucker (Mt Stromlo Observatory, Australian National University) and D. Brout (University of Pennsylvania) | We report spectroscopic classifications and redshifts of 11 supernovae observed by DEBass. The targets were supplied by ATLAS and ZTF. The spectra (350-900nm) were obtained with the WiFeS instrument (Dopita et al. 2007 Ap&SS, 327, 245) on the ANU 2.3-metre telescope. Classifications were performed using superfit (Howell and Wang, 2002, BAAS, 34, 1256) and redshifts were estimated using Marz (Hinton et al. 2016, A&C 15, 61), the details of which are reported below. | 2021-09-19 10:04:00 | optical,supernovae | 2021-09-19 | 10:04:00 | 468 | [
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] | 14,923 |
14,926 | The supersoft X-ray phase of RS Oph | M. Orio (INAF-Padova and University of Wisconsin), K. Gendreau (NASA-GSFC), S. Pei (Padova University), M. Giese (University of Wisconsin), R. Ignace(East Tennessee State University), P. Pragati (MIT Kavli Institute for Astrophysics and Space Research), E. Ferrara (NASA/GSFC, CRESST and University of Maryland College Park), T. Enoto (RIKEN), H. Maehara (National Astronomical Observatory of Japan), Z. Azourmanian (NASA/GSFC), A. Fabian (IoA, Cambridge), N. Islam Syeda (NASA/GSFC and University of Baltimore), K. Mukai, (NASA/GSFC, CRESST and University of Baltimore, Baltimore County), H. Maehara (National Astronomical Observatory of Japan), J. Miller (Univ. of Michigan), J. Nichols (CfA), M. Parker (IoA, Cambridge) | RS Oph is being monitored with NICER almost daily. In the most recent observations, we detected a luminous supersoft X-ray source, in agreement with recent measurements (ATel #14894, ATel #14901) with very few counts above 1.5 keV. The count rates were 942.0 ± 0.5 cts/s on 2021 September 19 (averaged over a net exposure time of 6580 s, in different snapshots lasting up to about 1000 s each), 898.5 ± 0.6 cts/s on 2021 September 19 (with a total net exposure of 5950 s), and 2072.0 ± 0.9 cts/s on 2021 September 20 (with a total net exposure of 2460 s). We estimate an average absorbed flux 7.7 x 10-10 erg/cm2/s on September 19, 7.3 x 10-10 erg/cm2/s on September 20, and a large increase to approximately 1.6 x 10-9 erg/cm2/s on September 21. On all these dates, the spectrum can be approximately fitted with a blackbody at a temperature around 40 eV, absorbed with a column density of in the range 5-6 x 10 22 cm-2 and a component of thermal plasma at 1.1 keV. Pulsations with a period of 35.10 ± 0.01 s and amplitude of up to 20% were measured on September 18, and with a period 34.95 ± 0.01 s and smaller amplitude on September 19. The amplitude of the pulsations varied, and an irregular drift of the period around the mean value of about 35 s was also apparent. | 2021-09-21 05:26:00 | x-ray,nova | 2021-09-21 | 05:26:00 | 1,270 | [
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14,927 | SRG/eROSITA discovery of the classical nova AT2021jiu as a bright super-soft X-ray source | Iuliia Grotova (MPE), Christian Kirsch (ECAP), Arne Rau (MPE), Ole König (ECAP), Ingo Kreykenbohm (ECAP), Mirko Krumpe (AIP), Georg Lamer (AIP), Zhu Liu (MPE), Adam Malyali (MPE), Axel Schwope (AIP), Jörn Wilms (ECAP) | On 2021 September 17th, the near real time analysis of data from of the eROSITA instrument (Predehl et al. 2021, A&A 647, A1) aboard the Russian/German Spektrum-Roentgen-Gamma (SRG) mission (Sunyaev et al. 2021, arXiv:2104.13267) discovered a bright super-soft X-ray source designated as eRASSt_J170907.9-373041 and located at: R.A.(J2000) = 17:09:08.04 (257.28350deg) Dec.(J2000) = -37:30:40.3 (-37.51119deg) with an estimated positional uncertainty of ~2" radius (incl. systematic uncertainty). The X-ray position is consistent with AT 2021jiu (PNV J17091000-3730500, ASASSN-21fh) discovered by Stanek & Kochanek following its large amplitude (>8mag in g-band) optical outburst in April 2021 (https://www.wis-tns.org/object/2021jiu ) and spectroscopically classified as Fe II classical nova (Joshi et al., ATel #14544). As part of its regular 4th all-sky survey, eROSITA scanned over the position of AT 2021jiu 8 times on 2021 September 17th with ~40s long visits separated by 4hr. During this period, the X-ray flux remained constant with the average value of ~9 cts/s. The eROSITA spectrum is well described by an absorbed blackbody model with kT=40.5 +/- 0.3 eV and equivalent hydrogen column N_H=(8.3 +/-0.1)e20 cm^-2, using the Bayesian X-ray Analysis spectral fitting software (Buchner+14). The corresponding absorbed 0.2-2.3keV flux is (1.77e+/- 0.04)e-11 erg/cm^2/s, ~500x times brighter than in the 3-sigma upper limit from eROSITA's previous visit to the location on 2021 March 18th (one month prior to the optical discovery). The X-ray properties suggest that eROSITA detected the super-soft X-ray source (SSS) state of AT2021jiu, as seen in other classical novae (see, e.g., Henze et al. 2014, A&A 563, A2, and references therein). During this state, the X-ray emission is produced by stable hydrogen burning on the surface of the white dwarf. AT 2021jiu was also observed with the 7-channel optical/near-IR imager GROND mounted at the MPG 2.2m telescope at ESO's La Silla observatory (Greiner et al. 2008 PASP, 120, 405). Observations were performed on 2021 September 20th 00:55 UT under unfavorable seeing conditions (~2.5-3â). We measured the following AB magnitudes, calibrated against SkyMapper (gri) and 2MASS (JHK): gâ = 16.56 +/- 0.03 râ = 16.05 +/- 0.03 iâ = 15.12 +/- 0.04 J = 14.03 +/- 0.10 H = 14.05 +- 0.11 K = 12.45 +/- 0.10 We thank A. Hempel & P. Eigenthaler for their excellent support for obtaining the GROND observations. | 2021-09-21 21:34:00 | optical,x-ray,nova,transient | 2021-09-21 | 21:34:00 | 2,462 | [
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14,928 | SOAR follow up of six highly reddened Galactic classical nova candidates | A. Kawash, E. Aydi, J. Strader, K. V. Sokolovsky, and L. Chomiuk (MSU) | We report on spectroscopic follow up of six red, optical transients reported by Gaia Photometric Science Alerts between February 2018 and August 2021: Gaia18ajn, Gaia18cew, Gaia20dfb, Gaia20dfc, Gaia21axf, and Gaia21dwe. The color and the presence of emission lines in the low resolution Gaia spectra indicate that these transients were potentially highly reddened, Galactic classical novae. We obtained low resolution (R ~ 1000) spectra of these transients with the Goodman spectrograph (Clemens et al. 2004, SPIE, 5492, 331) on the 4.1 m SOAR telescope, during the nights of 2020-10-05 (Gaia20dfb) and 2021-10-20 (the rest). We found evidence of past nova eruptions in four of the candidates while no continuum or line emission was detected in the remaining two. Below is a table and brief discussion of our findings.
Gaia18ajn: The SOAR spectrum, taken more than 3 years after discovery, shows a red continuum with very weak emission lines of Halpha and possibly [Fe VI] 5176 A and [Fe VII] 5721 A. The SOAR spectrum, the emission lines in the Gaia spectrum, and the fact that it took more than a year to drop by 6 mags all suggest that the transient was a highly reddened, Galactic classical nova.
Gaia18cew: The SOAR spectrum shows a red continuum and broad emission lines of Halpha and [Fe VII] 6086. The FWHM of Halpha is around 2000 km/s. The SOAR spectrum, the emission lines in the Gaia spectrum, and the fact that it took over two years to decline by 6 mags indicate that the transient was a highly reddened, Galactic classical nova.
Gaia20dfb: The SOAR spectrum, taken around 3 months after discovery, shows a broad Halpha line with a FWHM of more than 2000 km/s. The transient declined by 3 mags in roughly 60 days, and the Gaia spectrum shows emission lines. This indicates that Gaia20dfb was a reddened classical nova.
Gaia20dfc: There was no sign of continuum or emission lines in the 1800 s SOAR spectrum at the location of the transient, observed more than a year after discovery. The transient declined by 4 mags in 55 days, and the Gaia low-resolution spectrum shows emission lines, similar to the previously mentioned classical nova candidates. The emission lines and the color in the Gaia spectrum are consistent with the other candidates, suggesting that this transient was likely a highly reddened classical nova, but a definitive classification based on the SOAR spectrum cannot be made.
Gaia21axf: There were no sign of continuum or emission lines in the 2400 s SOAR spectrum taken around 8 months after discovery. The previous Gaia non-detection at the position of this transient occurred on 2020-10-04, 136 days prior to the discovery date, so the eruption date and peak brightness are highly uncertain. It took about 24 days to decline by one magnitude in the Gaia lightcurve. The lack of flux in the blue side of the Gaia spectrum suggests that this was likely not a nearby dwarf nova outburst and could have been a reddened classical nova observed after peak brightness, but a definitive classification based on the SOAR spectrum cannot be made.
Gaia21dwe: The SOAR spectrum taken around 2 months after discovery, shows a red continuum with strong emission lines of H I, O I lines at 7773 and 8446 A, and C II 7235 A. The FWHM of Halpha is around 1400 km/s. The SOAR spectrum shows this was a highly reddened, Galactic classical nova. | 2021-09-21 23:30:00 | optical,nova,transient | 2021-09-21 | 23:30:00 | 3,371 | [
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] | 14,926 |
14,929 | Fermi-LAT detection of enhanced gamma-ray activity from the blazar PMN J1315-5334 | I. Mereu (INFN Perugia) 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 blazar PMN J1315-5334, also known as 4FGL J1315.1-5333 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 198.767667 deg, Decl. =-53.576667 deg (J2000; Massardi et al. 2008, MNRAS, 384, 775).
Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on September 18, 2021, with a daily averaged gamma-ray flux (E>100MeV) of (1.2 +/- 0.3) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 50 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL). This is the highest LAT daily flux ever observed for this source. The corresponding photon index is 2.25 +/- 0.18, and is smaller than the 4FGL value of 2.48 +/- 0.05.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. This source is being added to 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 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. | 2021-09-21 23:32:00 | gamma ray,agn,blazar,quasar,transient,request for observations | 2021-09-21 | 23:32:00 | 1,722 | [
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] | 14,927 |
14,930 | Fermi/GBM detection of renewed activity from the transient Be/X-ray binary GRO J1750-27 | C. Malacaria (USRA), P. Jenke (UAH), C. Wilson-Hodge (NASA-MSFC) | We report on recent detections with Fermi/GBM of the transient Be/X-ray binary system GRO J1750-27. GBM detected pulsations from the source starting on Sept. 18 (MJD 59475), when the source was detected with a spin frequency of 224.6784(43) mHz and with a pulsed flux in the 12-50 keV band of 0.086 +/- 0.013 erg/cm2/s. The last GBM detection of this source was in Apr. 15, 2015 (MJD 57127), when the source was undergoing one of its rare outbursts and pulsations were detected at a maximum spin frequency of 224.7316(2) mHz. The source thus shows spin-down during quiescence at a rate of about -2.6x10-10 mHz/s. GBM will keep monitoring the source. The GBM pulse history of this source can be found at: https://gammaray.nsstc.nasa.gov/gbm/science/pulsars/lightcurves/groj1750.html We encourage further observations with X-ray observatories and multi-wavelength facilities. | 2021-09-22 00:08:00 | x-ray,binary,neutron star,pulsar,star,transient | 2021-09-22 | 00:08:00 | 873 | [
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] | 14,928 |
14,931 | Monitoring the X-ray spectra and pulse profile evolution of the Be X-ray binary EXO 2030+375 during the giant outburst of 2021 | P. Pradhan (MIT), P. Thalhammer (Remeis-Observatory & ECAP, FAU Erlangen-Nuremberg), 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), 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), P. Jenke (UAH), J. Kennea (PSU), G. Raman (PSU) | EXO 2030+375 is a Be X-ray binary discovered during a giant outburst in 1985. Apart from normal Type-I outbursts associated with its periastron passage every ~46 days (Wilson et al. 2008), the source exhibited two giant outbursts in 1985 and 2006. Since 20 July 2021, EXO 2030+375 showed an increase in flux indicative of the onset of another giant Type II outburst as reported by MAXI/GSC in July 2021 (ATel #14809) and as also seen in the Swift/BAT lightcurves. Following this, NICER started monitoring the source and found that from 28 July 2021 to 24 August 2021 the 0.5-10 keV flux rose from 1.3e-09 erg/cm^2/s to 5.7e-09 erg/cm^2/s (ATel #14911). The NICER observations also show that the pulsar in EXO 2030+375 is spinning at a period of ~41.3 seconds (ATel #14911).
Since 25 August 2021, EXO 2030+375 has also been monitored with Swift/XRT. Modeling the XRT spectra of these observations with an absorbed power law indicates that the (absorbed) flux in the 0.5-10 keV band increased from 5.9e-09 erg/cm^2/s on 25 August 2021 to 6.9e-09 erg/cm^2/s on 05 September 2021. Thereafter, the flux remained nearly constant at ~6.7e-09 erg/cm^2/s in subsequent observations on 11 September 2021, 15 September 2021, and 16 September 2021. The X-ray spectra are almost unchanged during these observations. with the photon index ~1.47 and the equivalent hydrogen column density ~(3.3-3.7)e22 cm^-2, consistent with the earlier NICER findings.
EXO 2030+375 is the first pulsar in which a dramatic flip in its pulse profile was observed with changes in luminosity. As the luminosity decreased, the dominant X-ray beaming pattern changed from a fan-beam to a pencil-beam (Parmar, White, and Stella, 1989, ApJ 338, 373). For the current outburst we find that the Swift/XRT pulse profiles are triple-peaked with the main peak becoming more dominant as luminosity increases, as has also been reported for the NICER pulse profiles.
Additional NICER monitoring of the source from 25 August 2021 to 16 September 2021, i.e., contemporaneous with the Swift/XRT monitoring described above, continues to show spectral parameters and pulse profiles similar to that reported in ATel #14911.
The Fermi/GBM accreting pulsar monitor reveals that as of 18 September 2021 (59475.5 MJD), the spin frequency has increased to 24.2499(6) mHz and the RMS pulsed flux has risen to and plateaued at (2.82 +/- 0.02)e-09 erg/cm^2/s in the 12-50 keV range. Currently EXO 2030+375 is spinning up at 0.065 cycles/day/day. Fermi/GBM has been monitoring the RMS pulsed flux and frequency of EXO 2030+375 since 2008.
We will continue to monitor EXO 2030+375 during this outburst and strongly encourage observations at other wavelengths. | 2021-09-22 01:39:00 | x-ray,binary,neutron star,pulsar,star,transient | 2021-09-22 | 01:39:00 | 2,702 | [
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] | 14,929 |
14,932 | Swift Observations of ASASSN J205543.90+240033.5 | Peter Garnavich (Notre Dame) | Swift observed the field of ASASSN J205543.90+240033.5 (ASN-J2055 hereafter), a proposed AR Scorpii type binary (Kato et al. 2021, arXiv:2108.09060; arXiv:2109.03979) with an apparent orbital period of 12.56 hours and possible white dwarf spin modulation of 9.77 minutes. Two visits on 2021 Sept 6 were separated by three hours with the initial integration of 1206s in the UVW2 filter and later a 1049s integration in the UVW1 filter. ASN-J2055 was well-detected in both filters with UVOT event rates above sky of over 3 counts/s.
The average flux estimated in the UVW2 filter is 3.2e-15 erg/cm2/s/Ang and 1.5e-15 erg/cm2/s/Ang in the UVW1 filter. Light curves constructed using time bins ranging from 10s to 60s were extracted from the event data. No clear periodicity is detected at the expected 10 minute time-scale in either filter.
No significant x-ray detection of ASN-J2055 is seen in the XRT images. | 2021-09-23 22:32:00 | ultra-violet,x-ray,binary,cataclysmic variable,variables | 2021-09-23 | 22:32:00 | 909 | [
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] | 14,930 |
14,933 | Detection of 9 new bursts from FRB20201124A with the 100 m Effelsberg Telescope | Robert Main (MPIfR), Suryarao Bethapudi (MPIfR), Viswesh Marthi (NCRA) | We report on the detection of 9 bursts from FRB20201124A at 1.2 - 1.6 GHz with the Effelsberg 100m telescope. The observations spanned 5 hours beginning at 2021-09-21T01:00:00 UTC, and the burst fluences were in the range of ~1 - 12 Jy ms, suggesting a rate of ~1.8 bursts per hour above 1 Jy ms. These detections were followed by a CHIME detection later on the same day, as reported on the CHIME/FRB repeaters webpage (https://www.chime-frb.ca/repeaters/FRB20201124A). This follows 4 months of no detections, including during targeted observations with both uGMRT (2 hours of total exposure) and Effelsberg (20 hours of total exposure) in the interim. | 2021-09-24 04:58:00 | radio,fast radio burst | 2021-09-24 | 04:58:00 | 652 | [
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] | 14,931 |
14,934 | Classification of AT 2021sew as a Type-II Superluminous Supernova | B. P. Thomas, J. C. Wheeler (UT Austin), J. Vinko (Konkoly) | AT2021sew (ZTF21abjaeco) was observed on the 26th August 2021 with the blue arm, and on 20th September 2021 with the red arm of the Low Resolution Spectrograph-2 (LRS2-B and LRS2-R), mounted on the Hobby-Eberly Telescope (HET) at McDonald Observatory, Texas. The spectra were integrated for 2700s and had an observed-frame wavelength coverage of 3700-7000 AA and 6500-10500 AA for LRS2-B and LRS2-R respectively. We detect narrow- and intermediate-width components to the H-alpha and H-beta emission profiles that imply interaction with circumstellar hydrogen. The intermediate H-alpha and H-beta components appear red-shifted relative to the narrow components, with an implied velocity of ~1500 km/s. We also detect an emission profile in the blue that we identify as C III/N III (4640 AA) and He II (4686 AA), common to Type II SNe in the photospheric phase (Leonard et al. 2000). We determine a redshift from narrow host galaxy emission lines of z = 0.1524, which implies an uncorrected absolute peak magnitude M_r = -20.2. We note that this object is close to the MW galactic plane (b = -7.11). Given the bright absolute magnitude and slow light curve evolution, we suggest that this object is a Type II superluminous supernova. | 2021-09-24 06:49:00 | optical,supernovae | 2021-09-24 | 06:49:00 | 1,232 | [
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14,935 | Search for counterpart to IceCube-210922A 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 single track-like event IceCube-210922A (GCN 30862< https://gcn.gsfc.nasa.gov/gcn3/30862.gcn3>). The reconstructed origin was -37 degrees below the horizon for ANTARES. No up-going 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 all time. This leads to a preliminary 90% confidence level upper limit on the muon-neutrino fluence from a point source of 16 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 30 GeV.cm^-2 (580 GeV - 300 TeV) for an E^-2.5 spectrum. A search over an extended time window of +/- 1 day has also yielded no detection (52% visibility). ANTARES 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. | 2021-09-24 20:38:00 | tev,neutrinos,transient | 2021-09-24 | 20:38:00 | 1,240 | [
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] | 14,933 |
14,936 | MAXI/GSC detection of X-ray brightening from the X-ray pulsar XTE J1946+274 | M. Nakajima, H. Negoro (Nihon U.), T. Mihara (RIKEN), M. Sugizaki (NAOC), R. Uematsu (Kyoto U.), K. Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, K. Komachi, 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. Ishikawa, M. Tominaga, T. Nagatsuka, T. Omama, M. Kurihara (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, Y. Goto (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), | On 2021-09-23 (MJD 59480), the MAXI/GSC nova alert system triggered on X-ray brightening from the source positionally consistent with the transient Be/X-ray binary pulsar XTE J1946+274. A preliminary analysis reveals that this outburst started from 2021-09-20 (MJD 59477), and the 4-10 keV flux binned at 0.25 days centered on 2021-09-23.583 (MJD 59480.584) reached 0.083 ± 0.023 photons/s/cm2 (66 ± 18 mCrab). The onset phase of the current brightening is ∼ 0.95 (Porb=172.7 d and Tperi=55514.8(MJD); Marcu-Cheatham et al. 2015). This is the fourth detection of a series of X-ray activities from this source since its discovery in 1998 (Wilson et al. 1998, Smith \& Takeshima 1998). The source light curves can be checked at the following pages; MAXI(http://maxi.riken.jp/pubdata/v7l/J1945+273/index.html), Swift/BAT(https://swift.gsfc.nasa.gov/results/transients/weak/XTEJ1946p274/), Fermi/GBM(https://gammaray.nsstc.nasa.gov/gbm/science/pulsars/lightcurves/xtej1946.html), and the BeXRB monitor page(http://integral.esac.esa.int/bexrbmonitor/webpage_oneplot.php). | 2021-09-24 23:18:00 | x-ray,binary,neutron star,nova,pulsar,star,transient | 2021-09-24 | 23:18:00 | 1,066 | [
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] | 14,934 |
14,937 | ASASSN-21sa: A Deep Dimming Event | M. Rizzo Smith, K. Z. Stanek, C. S. Kochanek, T. Jayasinghe, D. M. Rowan, C. Christy, T. A. Thompson (OSU), B. J. Shappee (Univ. of Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus) | During the ongoing All-Sky Automated Survey for Supernovae (ASAS-SN, Shappee et al. 2014, Kochanek et al. 2017), using data from the quadruple 14-cm ``Cassius'', ``Payne-Gaposchkin'', and ``Paczynski'' telescopes, we identified a star undergoing a deep dimming episode. ASASSN-21sa (Gaia EDR3 source 5940900954032654848 at RA=16:35:45.11, DEC=-48:57:04.30, d~1500 pc, G=11.8 mag, BP-RP=1.3 mag) is luminous and red in Gaia EDR3 catalog (Gaia Collaboration et al., 2021, A&A 649, A1) leading it to be classified as a red giant (R=9.0 R_Sun; L=38.0 L_Sun). It was first observed by ASAS-SN on UT 2016-03-10. Presently, ASASSN-21sa has more than ~2,500 data points.
ASASSN-21sa has a quiescent mean magnitude of g~12.5 (V~12.0). The latest ASAS-SN photometry shows that ASASSN-21sa started to dim around UT 2021-08-24. As of UT 2021-09-24 ASASSN-21sa has faded to g~13.1 and remains faint. In the full ASAS-SN light curve there were no episodes of dimming present in the last ~2000 days.
We 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 to the Ohio State University, NSF grant AST-1908570, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Chinese Academy of Sciences South America Center for Astronomy (CASSACA). | 2021-09-25 03:49:00 | optical,star,supernovae,the sun,variables | 2021-09-25 | 03:49:00 | 1,418 | [
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14,938 | Search for counterpart to IceCube-210926A 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 cascade event IceCube-210926A ([https://gcn.gsfc.nasa.gov/notices_amon_icecube_cascade/135747_58376130.amon]). At the time of the alert, the reconstructed origin was -70.6 degrees below the horizon for ANTARES. No up-going 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 all time. This leads to a preliminary 90% confidence level upper limit on the muon-neutrino fluence from a point source of 21 GeV.cm^-2 over the energy range 2.3 TeV â 3.2 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and 30 GeV.cm^-2 (380 GeV - 240 TeV) for an E^-2.5 spectrum. A search over an extended time window of +/- 1 day has also yielded no detection (73% 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. | 2021-09-27 16:39:00 | tev,neutrinos,transient | 2021-09-27 | 16:39:00 | 1,311 | [
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] | 14,936 |
14,939 | Fermi-LAT detection of Fermi J1623-1752 and its possible association with recurrent nova U Scorpii | B. Rani (Korea Astronomy and Space Science Institute), G. La Mura (LIP), C. C. Cheung (NRL), 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 detected a new transient gamma-ray source, Fermi J1623-1752. From data obtained on 2021 Sep 28 (00:00-06:00 UTC), preliminary analysis indicates a detection of greater than 5-sigma significance with a (E >100 MeV) flux of (7.2 +/- 5.2) x 10^-7 photons cm^-2 s^-1 and a relatively hard spectrum (single power-law photon index = 1.8 +/- 0.4); statistical uncertainties only. The best-fit position is RA, Dec (J2000) = 245.82 deg, -17.88 deg, with a 95% (99%) confidence error radius of 0.16 deg (0.20 deg).
A possible counterpart to the LAT transient is the recurrent nova U Scorpii with position offset by 0.18 deg from the LAT position, thus just outside the 95% confidence error circle, but within the 99% confidence error circle. U Sco has a known recurrence interval of 10.3 years (Schaefer 2010, ApJS, 187, 275) prior to its outburst in January 2010, thus a new outburst from U Sco could be anticipated. The last observation of U Sco in the AAVSO lightcurve database was on 2021 Sep 19.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. In consideration of the ongoing activity of this source, we encourage multi-wavelength observations, particularly optical follow-up of U Sco. For this source the Fermi LAT contacts are B. Rani (binduphysics@gmail.com) and C.C. Cheung (Teddy.Cheung@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. | 2021-09-29 03:31:00 | optical,gamma ray,nova,transient | 2021-09-29 | 03:31:00 | 1,749 | [
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] | 14,937 |
14,940 | Apparent Outburst of Comet 382P/Larson | 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 382P/Larson, discovered in Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002) data. Photometry of the comet in the r-band was 18.76+/-0.12, 19.17+/-0.22, and 18.74+/-0.15 at 2021 Sep 16 06:04, Sep 20 05:35, and Sep 22 05:58 UTC, respectively (all photometry is measured with 5" radius apertures and calibrated to the PS1 photometric system). On Sep 27 05:26 UTC, the comet brightened to r=17.84+/-0.03 mag. Comparison to an average of the three previous measurements suggests an outburst strength of -0.98+/-0.09 mag. The outburst was confirmed in subsequent observations with the 0.7-m GROWTH India Telescope on Sep 27 15:48 UTC (r=17.96+/0.03 mag, g=18.62+/-0.05 mag) and a Las Cumbres Observatory 1-m telescope at Cerro Tololo Interamerican Observatory on Sep 27 23:50 (r=17.87+/-0.02 mag). At the time of the outburst discovery, the comet was 4.48 au from the Sun and 3.72 au from the Earth. The comet's next perihelion occurs in March 2022.
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/ | 2021-09-29 04:51:00 | optical,comet,the sun,transient | 2021-09-29 | 04:51:00 | 2,251 | [
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] | 14,938 |
14,941 | No bright optical counterpart to the GeV transient Fermi J1623-1752 near U Sco | Kirill Sokolovsky, Elias Aydi, Vincenzo Donofrio (MSU) | Following the report of GeV transient detected by Fermi on 2021-09-28 00:00-06:00 UTC (ATel #14939) we used the 0.6m telescope of the Michigan State University observatory to search for a possible optical counterpart of the transient. The unfiltered images taken between 2021-09-29 00:31-01:03 cover most of the 0.16deg 95% Fermi error circle down to V~16. The visual comparison with DSS2 red image revealed no new sources. We obtained a deeper exposure centered on U Sco finding it at CV=18.6 +/-0.1 (unfiltered observation with V zero-point) on 2021-09-29 00:35, around its quiescent magnitude. | 2021-09-29 13:01:00 | optical,nova,transient | 2021-09-29 | 13:01:00 | 596 | [
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14,942 | Radio Detection of SN 2021yja | R. Z. E. Alsaberi (Western Sydney University), S. D. Ryder (Macquarie University), L. Marnoch (Macquarie University), E. Kundu (Michigan State University), M. D. Filipovic (Western Sydney University), G. Anderson (ICRAR/Curtin University), C. Stockdale (Marquette University), K. Maeda (Kyoto University), M. Renaud (LUPM, CNRS/IN2P3), R. Kotak (University of Turku) | Following up on our earlier non-detection of the Type II SN 2021yja (ATel #14915), we re-observed the source with the Australia Telescope Compact Array (ATCA) at 9.0 and 5.5 GHz GHz on 2021 Sep 24.7 UT, and at 18.0 GHz on 2021 Sep 27.9 UT. It was detected with flux densities of 0.09 +/- 0.02 mJy at 18.0 GHz, and 0.08 +/- 0.03 mJy at 9.0 GHz, while at 5.5 GHz no source above a 3-sigma limit of 0.03 mJy was detected. This is consistent with SN 2021yja still being optically thick at centimeter wavelengths and further monitoring is planned. 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 (grid.421683.a) 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. | 2021-09-29 15:33:00 | radio,supernovae | 2021-09-29 | 15:33:00 | 895 | [
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] | 14,940 |
14,943 | A major outburst of comet 29P/SchwassmannâWachmann 1 | Zhong-Yi Lin (IANCU), Wing-Huen Ip (IANCU) | We report that a major outburst of comet 29P/SchwassmannâWachmann 1 was detected by the R-band images obtained with the SLT at Lulin observatory (https://www.astro.ncu.edu.tw/people/zylin/29P_202109.html ). The outburst was observed to begin on 2021 September 25 with its brightness suddenly increasing by ~1.0 mag. as measure through a 6.3 arcsec aperture. The brightness keeps brightening from 14.87 mag (Sep. 25) to 12.44 mag (Sep. 28) and the coma with a star-like shape is getting bigger and bigger. The outburst event was larger than that report in August 2021 (Atel#14898). Photometry of the image was all measure with the same radius and calibrated to PS1 catalog. | 2021-09-29 18:08:00 | optical,comet,star | 2021-09-29 | 18:08:00 | 674 | [
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] | 14,941 |
14,944 | A fast rotation period and large amplitude for PHA 2021 NY1 | M. Ferrais (Aix Marseille University, France), E. Jehin (University of Liege, Belgium) | We report optical light curve observations of the near earth asteroid 2021 NY1. It was first observed with Pan-STARRS 1, Haleakala, on 2021, July 7 and has been classified by the Minor Planet Center as a potentially hazardous asteroid. The asteroid has an absolute magnitude of 21.5 that suggests a diameter of roughly 150 meters. 2021 NY1 approached within 0.010 AU (approximately four lunar distances) on September 22. We carried out photometric observations with the 0.6-m Ritchey-Chretien TRAPPIST-South (I40) robotic telescope located at the ESO la Silla Observatory on 2021, September 25, 27 and 28 when the object had a visual magnitude of about 16.0 and a phase angle ranging from 84 to 68 degrees. Analysis of the three datasets covering respectively 3, 5 and 2 hours of continuous observations revealed obvious and fast brightness variations on the raw images and allowed us to derive a fast rotation period of 0.2224 +/- 0.0001 h using the FALC algorithm. The composite light curve covering many rotations each night indicates on all nights a large amplitude of about 1.4 mag. | 2021-09-29 22:01:00 | optical,asteroid,planet,potentially hazardous asteroid,solar system object | 2021-09-29 | 22:01:00 | 1,087 | [
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] | 14,942 |
14,945 | New X-ray transient Swift J162315.0-175233: a possible counterpart to Fermi J1623-1752 | K. L. Page, P. A. Evans and J. P. Osborne (U. Leicester) | Following the announcement by Fermi-LAT of a new gamma-ray source Fermi J1623-1752 (Rani et al., ATel #14939), with an error region encompassing the recurrent nova U Sco, Swift performed a ~5 ks Target of Opportunity observation of the field of U Sco between 2021 September 28 20:40 UT and September 29 03:17 UT. No X-ray source is detected at the location of U Sco by the XRT, to a 3-sigma upper limit of 2.2x10-3 count s-1. The UVOT measures magnitudes of u = 18.95 +/- 0.25, uvw1 = 19.60 +/- 0.32, uvm2 = 19.81 +/- 0.18 and uvw2 = 19.36 +/- 0.30. Given that U Sco in outburst reaches a visual magnitude of ~7.5, these observations show that the nova is not currently erupting, a conclusion also reached by Sokolovsky et al. in ATel #14941.
There is, however, a previously uncatalogued X-ray source, at a position of RA, Dec(J2000) = 245.81275 deg, -17.87598 deg, which is equivalent to
RA(J2000) = 16h 23m 15.06s Dec(J2000) = -17d 52m 33.5s with an estimated 90% uncertainty radius of 2.9 arcsec.
This source has a 0.3-10 keV XRT count rate of 0.020 +/- 0.003 count s-1, with a spectrum which can be approximated by a power-law of Gamma = 1.5 +0.7/-0.6, with an absorbing column consistent with the Galactic value of 2.32x1021 cm-2 (Willingale et al. 2013). The 0.3-10 keV flux is 9.3 x 10-13 erg cm-2 s-1 (observed; 1.1 x 10-12 erg cm-2 s-1 unabsorbed).
Combining all the previous Swift-XRT observations (a total of > 300 ks), the earlier upper limit at this position is 1.85 x 10-4 count s-1.
This new source is not detected by the UVOT, to the following limits: u > 19.61, uvw1 > 20.02, m2 > 20.83 and uvw2 > 19.78.
This source was automatically detected as a likely transient by the forthcoming Live Swift-XRT Point Source Catalogue (LSXPS), which is currently undergoing pre-release testing, and is named Swift J162315.0-175233.
The position of Swift J162315.0-175233 is only 29 arcsec from the Fermi-LAT position given in ATel #14939, and therefore fully consistent with that localisation. This new X-ray source may be the counterpart of the new Fermi-LAT detection. | 2021-09-29 23:15:00 | ultra-violet,x-ray,gamma ray,nova,transient | 2021-09-29 | 23:15:00 | 2,082 | [
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] | 14,943 |
14,946 | Low-frequency follow-up of SGR 1935+2154 with the uGMRT | Shubham Singh (NCRA-TIFR), Jayanta Roy (NCRA-TIFR) | Following multiple triggers from Fermi Gamma-Ray Burst Monitor (GBM) over a period of 2021 September 6 to 10 (ATel #14907) and detection of 20 burst candidates with The Neutron star Interior Composition Explorer (NICER) on 2021 September 11 and 12 (ATel #14916) from Galactic magnetar SGR 1935+2154, we observed with the upgraded Giant Metrewave Radio Telescope (uGMRT) on 2021 September 17. During the 2020 April episodes of X-ray flares, radio millisecond bursts from this source were detected with the CHIME (CHIME/FRB Collaboration 2020), STARE2 (Bochenek et al. 2020) and FAST ((Zhang et al. 2020). We observed SGR 1935+2154 with the uGMRT simultaneously in band-3 (300-500 MHz) and band-4 (550-750 MHz) on 2021 September 17 for a duration of two hours (17:54:17 - 18:34:49 UT and 18:45:57 - 20:07:49 UT). The full array was divided into two sub-arrays with 8 and 14 antennas each in band-3 and band-4 respectively. In band-4 filterbank was recorded with 8192 channels over 200 MHz band-width sampled at 327.68 micro-second time-resolution. The band-3 data was coherently dedispersed at a DM of 332.7 pc cm^-3 producing a filterbank having 2048 channels over 200 MHz at a time-resolution of 40.96 micro-second. We dedispersed the data at the magnetar DM and performed periodicity search using Fast Folding Algorithm (FFA, Morello et al. 2020) and single pulse search using PRESTO (Ransom et al. 2001). We did not find any radio emission, either pulsation (with periodicity of 3.24s, Israel et al. 2014) or burst above a significance of 7-sigma. We use a nearby known pulsar J1954+2923 to calibrate the gain of the phased array beam in band-3 and band-4 observations to estimate the noise. The 7-sigma upper limit of flux density for periodic signal is 0.4 mJy for both band-3 and band-4 (assuming 5% duty-cycle). For burst events, 7-sigma upper limit on fluence is around 3 Jy-ms for band-3 and band-4. We thank the staff of the GMRT who have made these observations possible. GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. | 2021-09-30 13:31:00 | radio,x-ray,gamma ray,fast radio burst,gamma-ray burst,magnetar,neutron star,pulsar,soft gamma-ray repeater,star | 2021-09-30 | 13:31:00 | 2,086 | [
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] | 14,944 |
14,947 | Possibly Significant Meteor Activity From Very Young Dust Ejecta From Comet 15P/Finlay | Quanzhi Ye (UMd), Jeremie Vaubaillon (IMCCE/Observatoire de Paris/PSL, France), Mikiya Sato (NAOJ), Mikhail Maslov (Novosibirsk State Univ/Novosibirsk State Technical Univ) | Our independent calculations have predicted a possible new meteor activity originated from Jupiter-family comet 15P/Finlay. In particular, P/Finlay experienced two strong outbursts in its last apparition in 2014/15 (cf. Ye et al. 2015, ApJ 814, 79; Ishiguro et al. 2016, AJ 152, 169), of which the ejecta is predicted to come in the path of the Earth this year, hence significant meteor activity (with a small chance of reaching storm level) is possible. The predicted encounter with the 2014 ejecta is between approximately 2021 October 6, 2200 UT, and 2021 October 7, 0100 UT, as summarized in the table below. The significant scatter in predicted peak times calculated by different researchers is likely due to the very shallow orbit of the stream with respect to the ecliptic plane. The radiant is located near RA=256 deg and Dec=-48 deg, favoring observers in South America and Antarctica. The outburst is likely dominated by faint meteors around visual magnitude of +8; however, visual monitoring is still strongly encouraged as the technique is widely accessible and will examine a different size regime (close to cm-class meteoroids). Observations of this meteor shower will provide important constraints on the dust size distribution in the mm/cm-class regime of this very young dust ejecta and allow comparison with comet observations. Several other minor outbursts caused by the ejecta from earlier apparitions of P/Finlay are also expected (Maslov, unpublished; Vaubaillon et al. 2020, JIMO 48, 29). | 2021-10-01 08:28:00 | optical,comet,meteor | 2021-10-01 | 08:28:00 | 1,511 | [
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] | 14,945 |
14,948 | The gamma-ray source Fermi J1623-1752 and X-ray transient Swift J162315.0-175233 are likely GRB 210928A | M. Axelsson (Stockholm Univ.), E. Bissaldi (Politecnico & INFN Bari), C. C. Cheung (NRL), G. La Mura (LIP), on behalf of the Fermi Large Area Telescope Collaboration | Further analysis of the Fermi-LAT source Fermi J1623-1752 (Rani et al., ATel #14939) has revealed that it is likely a gamma-ray burst, which occurred on 2021 September 28 at 02:00:31 UT. This GRB triggered the Gamma-ray Burst Monitor (GBM) instrument onboard Fermi, but no alert was sent out. When the transient was discovered it was therefore labeled as a new gamma-ray transient, rather than a GRB.
The best LAT on-ground location is found to be RA, Dec = 245.88, -17.91 (degrees, J2000), with an error radius of 0.15 deg (90% containment, statistical error only). This location is consistent with both the recurrent nova U Sco (currently in quiescence; Sokolovsky et al., ATel #14941) as well as the Swift X-ray transient reported by Page et al. (ATel #14945). If Fermi J1623-1752 is indeed GRB 210928A, the Swift transient is likely the afterglow.
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. | 2021-10-01 22:22:00 | x-ray,gamma ray,gamma-ray burst,nova,transient | 2021-10-01 | 22:22:00 | 1,127 | [
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] | 14,946 |
14,949 | Discovery of a Probable Nova in M81 | K. Hornoch, H. Kucakova (Ondrejov), P. Zasche (Charles University), S. C. Williams (Turku), G. Sala, J. Jose (UPC-IEEC), B. Stecklum (TLS), M. J. Darnley (LJMU), A. Kaur (PSU), D. H. Hartmann (Clemson), A. W. Shafter (SDSU) | The M81 nova monitoring collaboration reports the discovery of a probable nova in M81 on a co-added 720-s unfiltered CCD frame taken on 2021 Oct. 1.164 UT with the 0.65-m telescope at Ondrejov.
The object designated PNV J09554017+6902478 is located at R.A. = 9h55m40s.17, Decl. = +69o02'47".8 (equinox 2000.0), which is 37.5" east and 67.3" south of the center of M81 (see link to discovery image below).
As with all extragalactic novae, follow-up spectroscopic and photometric observations to determine the nova's spectroscopic class and rate of decline (speed class) are encouraged. | 2021-10-03 01:45:00 | optical,nova,transient | 2021-10-03 | 01:45:00 | 586 | [
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] | 14,947 |
14,950 | Palomar Gattini-IR NIR detection and classification of a young, highly reddened Galactic classical nova PGIR21git / AT2021aadi / Gaia21ejq | K. De (MIT), M. Hankins (ATU), L. Hillenbrand (Caltech), M. M. Kasliwal (Caltech), J. Sokoloski (Columbia), M. Ashley (UNSW), A. Babul (Columbia), V. Karambelkar (Caltech), R. M. Lau (ISAS/JAXA), A. Moore (ANU), E. O. Ofek (Weizmann), M. Sharma (Columbia), J. Soon (ANU), R. Soria (NAOC), T. Travouillon (ANU) on behalf of the Palomar Gattini-IR team | We report the detection and spectroscopic classification of a highly reddened Galactic classical nova PGIR21git by the Palomar Gattini-IR survey (De et al. 2020, Moore & Kasliwal 2019). The source was identified as part of a dedicated filter to search for large amplitude Galactic plane transients (De et al. 2021). PGIR21git was first detected in the Gattini data processing pipeline on UT 2021-09-19 at a J magnitude of 12.83 +/- 0.27 AB mag, at J2000 coordinates of RA 18:00:44.85 Dec -21:39:41.46 corresponding to a Galactic latitude of 0.7 degrees. The transient was not detected on UT 2021-09-17 to a 5 sigma limiting magnitude of J ~ 12.4 mag. The source was also reported to the Transient Name Server as AT 2021aadi by Gaia as Gaia 21ejq, who detected the source on 2021-09-20. The integrated extinction along this line of sight is ~ 15 mags in g band and ~ 4 mags in J band (Schlafly et al. 2011). There is no source reported at this position in archival 2MASS images. The source has subsequently brightened to J ~ 10.8 mag on UT 2021-10-03. We obtained an optical spectrum of the source on UT 2021-10-03 using the SED Machine spectrograph (Blagorodnova et al. 2018) on the Palomar 60-inch telescope. The spectrum shows a highly reddened continuum with broad unresolved emission lines of the Balmer series, O I and Ca II, consistent with a reddened classical nova in the Galactic plane. Further follow-up observations are underway and we encourage multi-wavelength follow-up observations of the young nova. | 2021-10-03 23:30:00 | infra-red,optical,cataclysmic variable,nova,transient,variables | 2021-10-03 | 23:30:00 | 1,515 | [
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] | 14,948 |
14,951 | MASTER OT J194403.17-521431.8 - new OT outburst, ampl>4m | K. Zhirkov, V. Lipunov, V. Kornilov, E. Gorbovskoy, N. Tyurina, P. Balanutsa, V. Vladimirov, A. Kuznetsov, D. Vlasenko, Ya. Kechin, D. Zimnukhov, V. Senik, V. Topolev, T. Pogrosheva, D. Cheryasov (Lomonosov Moscow State University, SAI, PhysicsDepartment), O. A. Gres, N. M. Budnev (Irkutsk State University, API), R. Podesta, F. Podesta, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V. Yurkov (Blagoveschensk Educational StateUniversity) | MASTER OT J194403.17-521431.8 discovery - new OT outburst, ampl>4m
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 19h 44m 03.17s -52d 14m 31.8s on 2021-10-04.03809 UT. The OT unfiltered magnitude is 18.2m (mlim=19.3). The OT is seen in 3 images. There is no minor planet at this place. We have reference image on 2020-05-27.27075 UT with unfiltered 19.8m. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/194403.17-521431.8.png | 2021-10-04 21:42:00 | optical,cataclysmic variable,planet,transient,variables,request for observations | 2021-10-04 | 21:42:00 | 608 | [
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14,952 | J0854+2006 (OJ 287) : mm/sub-mm flare with polarization angle change | Seiji Kameno, Paulo Cortes, Edward Fomalont, Ruediger Kneissl, Antonio Hales, Celia Verdugo, Matias Radiszcz, Kurt Plarre, Cristian Lopez, Satoko Takahashi, Jose Fernandez, Jorge Garcia, Charles Hull, Pei-Ying Hsieh, Hugo Messias, David Rebolledo, Gabriel Marinello, Enrique Macias, Juan Cortes, Sergio Martin, Stuartt Corder (Joint ALMA Observatory), Claudia Agliozzo, Marie-Lou Gendron-Marsolais, Alvaro Ribas, Alejandro Santamaria, Chentao Yang, Eric Villard (European Southern Observatory), Brenda Matthews, Gerald Schieven (National Research Council Canada) | The Atacama Large Millimeter/submillimeter Array (ALMA) has been monitoring the blazar J0854+2006 (OJ 287) at 97.5, 233, and 343.5 GHz. The total flux densities at 97.5, 233, and 343.5 GHz achieved at 6.22 +- 0.19 Jy, 4.38 +- 0.14 Jy, and 3.87 +- 0.14 Jy, respectively, on 2021-09-29 (Gaussian convolution with a 5-day width). They have been doubled since the last trough values of 3.14 +- 0.10 Jy, 2.31 +- 0.11 Jy, and 1.94 +- 0.06 Jy on 2021-05-01. Linearly polarized flux densities are also high with the polarization degree of (6.0 +- 3.3)%, (6.6 +- 1.5)%, and (9.5 +- 0.5)%, respectively. The electric-vector position angles (EVPAs) of linear polarization have changed from -44.6 +- 2.4 deg, -45.5 +- 1.5 deg, and -44.0 +- 4.1 deg in April 2021 to -15.9 +- 8.3 deg, -19.6 +- 7.6 deg, and -12.2 +- 0.6 deg in September 2021 by ~30 deg. In addition to the latest flare event, there are identified but unreported flares coupled with polarization variations in June 2014, July 2015, December 2015, April 2016, August 2016, January 2018, and February 2020. See the detail of mm/sub-mm measurements: http://www.alma.cl/~skameno/AMAPOLA/J0854+2006.flux.html | 2021-10-04 21:51:00 | radio,millimeter,sub-millimeter,agn,blazar | 2021-10-04 | 21:51:00 | 1,155 | [
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] | 14,950 |
14,953 | GX 339-4 in transition back to the hard state with the compact jets in formation | S. Corbel (Universite de Paris), T. Tzioumis (ATNF), L. Tremou (Observatoire de Paris) & F. Carotenuto (Universite de Paris) | GX 339-4 initiated a new outburst earlier this year (see e.g. ATel #14336, #14351, #14352) and the evolution of its X-ray outburst can usually be followed with monitoring such as Swift/BAT and MAXI. GX 339-4 has been in the soft state since 2021, March 28 (ATel #14490, #14507).
The current X-ray light curves (Swift/BAT and MAXI 10-20 keV) indicate that the hard X-ray emission of GX 339-4 has been rising slowly for ~ the last 2 weeks, possibly indicating a transition back to the hard state during the final decay of its 2021 outburst.
We have been monitoring regularly GX 339-4 in radio with the Australia Telescope Compact Array (ATCA), located in Narrabri, Australia. We conducted new radio observations on October 3 and a radio source is detected at the core location with flux density of 0.63 +/- 0.04 mJy at 5.5 GHz and 0.21 +/- 0.4 mJy at 9 GHz. Despite the radio emission is optically thin, we are likely observing the onset and the building up of the compact jets during the decaying hard state (see Corbel et al. 2013, MNRAS, 431, L107). This also likely confirms that GX 339-4 is undergoing a transition back to its final hard state.
Further observations are planned. Multiwavelength support is encouraged in order to follow the spectral evolution.
We thank Jamie Stevens and ATCA staff for making this observation possible. We acknowledge the Gomeroi people as the traditional owners of the ATCA observatory site. | 2021-10-04 21:52:00 | radio,x-ray,black hole,request for observations | 2021-10-04 | 21:52:00 | 1,432 | [
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] | 14,951 |
14,954 | The X-ray lightcurve and spectrum observed with NICER | M. Orio (INAF-Padova and University of Wisconsin), K. Gendreau (NASA-GSFC), S. Pei (Padova University), M. Giese (U Wisconsin), D. Altamirano (Southampton), Z. Azourmanian (NASA/GSFC), T. Enoto (RIKEN), A. Fabian (IoA, Cambridge), E. Ferrara (NASA/GSFC, CRESST and University of Maryland College Park), R. Ignace(East Tennessee State University), N. Islam Syeda (NASA/GSFC and University of Baltimore), K. Mukai, (NASA/GSFC, CRESST and University of Baltimore, Baltimore County), H. Maehara (National Astronomical Observatory of Japan), C. Markwardt (NASA-GSFC), J. Miller (Univ. of Michigan), J. Nichols (CfA), M. Parker (IoA, Cambridge), P. Pragati (MIT Kavli Institute for Astrophysics and Space Research), T. Strohmayer (NASA-GSFC), M. Wolff (US Naval Research Laboratory)) | RS Oph was observed with NICER in the 0.2-12 keV energy range, with several short exposures (usually lasting up to ~1000 s) done every day during 2021 September (see also ATel #14926, ATel #14901, ATel #14864). The average count rate showed a rapid increase on 9/18/2021, followed by a moderate decrease on the following day, then it increased again reaching a peak on 9/21/2021. Then, a rapid decrease occurred within few hours, but we measured another rise up to a maximum average count rate of ~3500 cts/s on exposures taken on 9/26/2021. After small oscillations, a constant decrease was measured since 9/27/2021. On 9/30/2021 the average count rate was ~1100 cts/s, with irregular fluctuations. In the last snapshot, the count rate had moderately risen again, to an average 1300 cts/s. We estimate that the absorbed flux was about 3 x 10-9 erg/cm2/s at maximum count rate, and 10-9 erg/cm2/s at minimum. The spectral shape did not change significantly during the decline, with a strong peak at 0.5 keV and almost no counts above 1 keV. Although the spectrum is complex, the soft flux can be fitted with a blackbody at about 45 eV. Moreover, the ~35 s quasi periodic oscillations remained detectable in several of the short snapshot exposures. This phenomenology suggests that the supersoft X-ray source may still be hot and luminous, but may be partially obscured at times by large clumps in the ejecta, that are optically thick to supersoft X-rays. The observations will resume tomorrow (October 5). NICER is a 0.2-12 keV X-ray instrument operating on the International Space Station. The NICER mission and portions of the NICER science team activities are funded by NASA. | 2021-10-05 01:00:00 | x-ray,nova | 2021-10-05 | 01:00:00 | 1,678 | [
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] | 14,952 |
14,955 | Swift observations of the super-soft nova ASASSN-21fh | K. L. Page and J. P. Osborne (U. Leicester) | The classical nova ASASSN-21fh (= AT2021jiu), discovered on 2021 Apr 12 by Stanek, Kochanek for the ASAS-SN team and classified by Joshi et al. (ATel #14544), following the eROSITA X-ray detection of Sep 17 (ATel #14927) was observed by Swift on 2021 Sep 30 (for 0.75 ks) and Oct 4 (for 1.09 ks).
There is no evidence for variability within or between these two Swift observations, either in the XRT or UVOT data.
The XRT detected a soft X-ray source at 0.62 +/- 0.03 count s-1. Its spectrum was well fit with an absorbed blackbody and optically thin plasma emission model. We find NH = (9.4 +2.0/-1.8) x 1021 cm-2 (consistent with the total Galactic column of 9.6 x 1021 cm-2; Willingale et al. 2013 MNRAS 431 394) and kTBB = 37 +/- 4 eV, kTAPEC = 0.99 +0.21/-0.22 keV. The blackbody and APEC emission models have unabsorbed 0.3-2 keV fluxes of 7.9 x 10-8 and 3.2 x 10-12 erg cm-2 s-1 respectively. The observed XRT flux is 30% lower than that quoted for eROSITA (ATel #14927) over the same energy band, while our spectral fit indicates higher absorption.
The mean UVOT magnitudes were uvw1 = 18.62 +/- 0.14, uvm2 > 19.68 and uvw2 > 19.76 (3 sigma upper limits).
These observations, taken 171-175 days after discovery, show the absorbed nova to be in a steady burning phase. With no evidence of cooling, the low blackbody temperature at this time suggests a white dwarf mass below solar (e.g. Sala & Hernanz 2005 A&A 439 1061; Wolf et al. 2014 ApJ 782 117). | 2021-10-05 23:54:00 | ultra-violet,x-ray,nova | 2021-10-05 | 23:54:00 | 1,462 | [
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] | 14,953 |
14,956 | H-alpha observations of M31 novae AT2021zdh and AT2021ypn | A. Valcheva (Sofia University, Bulgaria), M. Minev (Sofia University; IA with NAO, BAS, Bulgaria), I. Dimitrova (Sofia University; IA with NAO, BAS, Bulgaria), E. Ovcharov (Sofia Univeristy, Bulgaria), P. Nedialkov (Sofia University, Bulgaria) | We report H-alpha photometry of two recent novae in M31 - AT2021zdh (= XM58MZ) (= PNV J00424123+4114322) and AT2021ypn (= PSP21H)(= PNV J00424297+4117574). The observations in narrowband H-alpha (FWHM of 30Å) were performed in the direct focus of the 2m RCC telescope at NAO Rozhen, Bulgaria on 2021 Oct 3.065 UT under nonphotometric weather conditions (FWHM ~ 3 arcsec). Photometric magnitudes were obtained from 3x300 sec co-added frames (see here).
AT2021zdh was discovered by Mi Zhang and Xing Gao ( XOSS) on 2021 Sept 18.608 UT at unfiltered magnitude of 18.4 and later, on 2021 Sept 19.596 UT, J. Tonry, L. Denneau, A. Heinze and co-authors reported a magnitude of 17.48 obtained in orange-ATLAS filter. Our observations show that thirteen days after the discovery the transient is very bright in H-alpha with a magnitude of 15.08±0.03 and the continuum have decreased to R=18.13±0.05 mag (3x120 sec; 2021 Oct 3.055 UT). If the whole H-alpha emission has been detected through our 30 Å filter then the pure magnitudes are H-alpha=15.12 mag and R=18.67 mag. This result confirms the object classification as a nova.
We have detected on our images also the transient AT2021ypn, which was discovered on 2021 Sept 11.602 UT by Mi Zhang and Xing Gao ( XOSS) and has been confirmed as a nova with a very strong H-alpha emission (ATel #14913) and FeII emission lines (ATel #14919); We report here that with the spectral evolution of the nova the H-alpha emission have increased to 15.42±0.03 mag, typical for some of the classical and recurrent novae. In addition we have obtained a decrease of R magnitude to 18.86±0.07 (3x120 sec; 2021 Oct 3.055 UT) which places the nova in the fast novae class (Payne-Gaposchkin 1964). If the whole H-alpha emission has been detected through our 30 Å filter then the pure magnitudes are H-alpha=15.44 mag and R=19.78 mag testifying much weaker continuum than AT2021zdh. | 2021-10-06 16:46:00 | optical,nova,transient | 2021-10-06 | 16:46:00 | 1,907 | [
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] | 14,954 |
14,957 | SOAR spectroscopic classification of Gaia21ejf as a highly reddened classical nova | A. Kawash, E. Aydi, J. Strader, K. V. Sokolovsky, and L. Chomiuk (MSU) | We report on spectroscopic follow up of Gaia21ejf, which was reported as a red transient on the rise by Gaia Photometric Science Alerts. So far, there have been only two detections on 2021-09-19.4 and 2021-09-19.5 at G = 18.4 and G = 18.2, respectively. Because of its red color and Galactic position (l,b) = (355.14, 0.04) degrees, we obtained low a resolution spectrum of the transient with the Goodman spectrograph (Clemens et al. 2004, SPIE, 5492, 331) on the 4.1m SOAR telescope on 2020-10-07.1 to identify if this is a highly reddened nova. A total of Av = 20 mag of extinction is predicted in the direction of this transient according to the dust maps of Marshall et al. (2006, A&A, 53, 635). There has been no detection down to g <18 mag at this position by the All-Sky Automated Survey for SNe (ASAS-SN, Shappee et al. 2014, ApJ, 788, 48) since it was first detected by Gaia, consistent with a highly reddened transient.
The SOAR spectrum shows a red continuum with emission lines of H I, O I, and Mg II. Halpha is barely resolved due to the high extinction towards the transient. The better resolved emission lines in the redder part of the spectrum show double peaked emissions. The O I lines at 7774 and 8446 are characterized by P Cygni absorptions with blueshifted velocities of around 1500 km/s. The spectrum is that of a highly reddened classical nova near optical peak.
This ATel is based on observations obtained at the Southern Astrophysical Research (SOAR) telescope, which is a joint project of the Ministerio da Ciencia, Tecnologia, Inovacoes e Comunicacoes do Brasil (MCTIC/LNA), the U.S. National Science Foundation's National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU). We also acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts). | 2021-10-07 22:27:00 | optical,nova,transient | 2021-10-07 | 22:27:00 | 1,895 | [
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] | 14,955 |
14,958 | Rapid Infrared spectroscopy of the highly reddened nova AT2021aadi with IRTF + SpeX: Fe II Classification and CO Overtone Emission | K. De (MIT) reports on behalf of the Palomar Gattini-IR team | The transient PGIR21git/Gaia21ejq/AT2021aadi was reported by the Palomar Gattini-IR survey (ATel #14950) as young and rising highly reddened Galactic nova. We obtained spectroscopic follow-up of the nova using SpeX (Rayner et al. 2003) on the NASA Infrared Telescope Facility. The data were acquired using the SXD and LXD modes with a 0.3 arcsec slit under good seeing conditions (~0.5 arcsec in K band), for total on source exposure times of 600s in each mode on UT 2021-10-06. The reduced spectrum covers the wavelength range from 0.75 to 5.3 microns. The spectrum shows a steeply red continuum rising from the optical to the NIR bands, peaking at ~ 1.6 microns. The continuum is dominated by a rich emission line complex consisting of H, He, N, O and Fe lines. We identify numerous features of C I, suggesting a Fe II classification (Banerjee & Ashok 2012). The strongest lines of H and He are clearly resolved, showing a complex profile with at least three peaks and a FWHM of ~ 900 km/s. We clearly detect strong emission lines in the CO overtone in K band, suggesting that the nova is likely to form dust. Continued photometric coverage from Gattini-IR suggests that the nova has just peaked in J-band and is currently exhibiting a plateau. Optical photometric observations would be beneficial to detect the start of the dust formation phase. We thank the IRTF team, especially Bobby Bus, John Rayner and Miranda Hawarden-Ogata for assistance with scheduling these observations (Program 2021B094; PI: De). | 2021-10-07 22:55:00 | infra-red,optical,nova,transient | 2021-10-07 | 22:55:00 | 1,511 | [
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] | 14,956 |
14,959 | Spectroscopic Classifications of SN 2021aaqn with Keck I + LRIS | K. Taggart, S. Tinyanont, R. J. Foley (UCSC), A. Gagliano (UIUC) | We report the classification of SN 2021aaqn as a young SN II with flash ionization features using spectroscopic observations with the LRIS spectrograph on the Keck I telescope, made on 2021 Oct 7 UT. The transient was discovered by the Young Supernova Experiment (YSE; Jones et al, 2021) on 2021 Oct 06 UT. The classification spectrum was obtained 22.5 hours after discovery. The spectrum shows narrow emission lines from Balmer series, He II 4686 A, and C IV 5801 A. The FWHM of H alpha is 1500 km/s. The redshift is consistent with the host redshift of z = 0.028. We encourage follow-up observations of this young supernova. We thank the Keck observatory staff and the classically scheduled observers for accommodating our ToO request. | 2021-10-08 19:29:00 | optical,supernovae,transient | 2021-10-08 | 19:29:00 | 737 | [
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] | 14,957 |
14,960 | Observations with the BOOTES Network of the current outburst in the dwarf-nova SW UMa | I. Perez-Garcia (UMA, Spain), C. Perez del Pulgar (UMA, Spain), A. Reina Terol (UMA, Spain), I. Carrasco-Garcia (UMA, Spain), E. Fernandez Garcia (IAA-CSIC, Spain), A. J. Castro-Tirado (IAA-CSIC, Spain), R. Sanchez-Ramirez (IAA-CSIC, Spain), M. D. Caballero-Garcia (IAA-CSIC, Spain), M. Jelinek (ASU-CAS, Ondrejov, Czech Rep.), I. H. Park (SSKU, Korea), W. H. Lee (SSKU, Rep. of Korea), and D. Hiriart (Instituto de AstronomÃa, UNAM, Mexico) | The BOOTES-1A wide field image telescope at the BOOTES-1 station in Mazagon (INTA-CEDEA, Huelva, Spain) telescope automatically detected a rise in the flux of the dwarf nova SW UMa at 02:48:47 UT on 7 Oct 2021. Its optical flux increased to 11 mag. (i.e. an increase of 5 mag.) in clear filter. Following this alert, a set of five images were obtained spanning 2h in total with the BOOTES-1B 0.3m robotic telescope located nearby.
B1A:
10.967 [+/-0.02] - 02:48:40
B1B:
10.953 [+/-0.006] - 03:23:52
10.905 [+/-0.005] - 03:47:51
11.004 [+/-0.007] - 04:12:09
10.857 [+/-0.005] - 04:24:48
10.898 [+/-0.005] - 04:31:01
Hours after, the JG telescope at the BOOTES-5 station in San Pedro Martir Astronomical Observatory in Mexico also gathered a set of images in u, g, r, i, Z and Y filters starting at 12:29:34 UT (i.e. seven hours later).
B5:
11.032 [+/-0.016] - 12:29:34 (clear)
13.391 [+/-0.108] - 12:36:15 (u')
11.196 [+/-0.016] - 12:30:48 (g')
11.389 [+/-0.017] - 12:32:01 (r')
11.579 [+/-0.015] - 12:33:15 (i')
12.326 [+/-0.018] - 12:34:07 (Z)
16.384 [+/-0.024] - 12:35:23 (Y)
The following night (7 Oct), the COLORES spectrograph at the TELMA telescope (BOOTES-2 station) took a set of 10 spectra in the 3000-11000A wavelength range, starting at 23:30 UT. Whilst a noticeable blue spectrum is observed (indicating the possible X-ray activity of the dwarf nova) neither clear absorption nor emission lines are visible. The flux is still high (g=11 mag.) indicating that further activity is currently on-going.
Observations at other wavelengths are encouraged. | 2021-10-08 22:33:00 | optical,x-ray,cataclysmic variable,nova,transient,variables | 2021-10-08 | 22:33:00 | 1,578 | [
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] | 14,958 |
14,961 | Near-Infrared Spectroscopy of an Outburst of Comet 29P/Schwassmann-Wachmann 1 | Silvia Protopapa (Southwest Research Institute), Michael S. P. Kelley (Univ. Maryland), Bin Yang (European Southern Observatory/Univ. Diego Portales) | We report on near-infrared spectroscopy of comet 29P/Schwassmann-Wachmann 1 following a series of outbursts that began on 2021 Sep 25. See the MISSION 29P site for more information on the event. We observed 29P with the NASA IRTF 3.2-m telescope and SpeX instrument, and obtained low-spectral resolution spectroscopy from 0.7 to 2.5 μm using a 0.5"x60" slit. Our data were taken on 2021 Sep 30 at 13:52 UTC and calibrated with a nearby solar analog. The data were acquired under excellent sky conditions. The comet was at a heliocentric distance of 5.9 au and geocentric distance of 5.5 au. The relative reflectance spectrum of 29P shows a 2.0-μm absorption feature with a relative depth of 2.6+/-0.3% with respect to the nearby continuum. We tentatively attribute the nature of this absorption feature to water ice based on its central wavelength, width, and shape. No clear 1.5-μm absorption band of water ice is detected in our spectra, possibly due to signal-to-noise limitations. We estimate an upper-limit for the 1.5-μm band depth of ~1%. | 2021-10-09 04:40:00 | infra-red,comet | 2021-10-09 | 04:40:00 | 1,045 | [
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] | 14,959 |
14,962 | Spectroscopic Classification of PNV J00444033+4113068 is NOT a nova in M31 but a dwarf nova in the Milky Way Galaxy | Kenta Taguchi (Kyoto University), Hiroyuki Maehara (National Astronomical Observatory of Japan) | We report spectroscopic observation of PNV J00444033+4113068 = AT 2021aaxp nearby M31 discovered by Koichi Itagaki. We obtained a low-resolution spectrum from 2021-10-09.697 UT to 2021-10-09.718 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 nearby-M31 object was discovered by Koichi Itagaki at 16.5 mag (unfiltered) on 2021-10-09.4579. He further reported that it was brightening: 15.7 mag on 2021-10-09.584, and 15.3 mag on 2021-10-09.806. Also, Dave Balam et al. discovered it identically at 17.77 mag (G-Gaia) on 2021-10-09.6125. There is a possible counterpart of g = 22.32 in the PS1 Mean object catalog.
Our spectrum shows a blue continuum, the He II lines (4686 and 5411 Å), a Bowen component (∼ 4640 Å), and the Hα line. The He II (4686 Å) and Hα lines show double-peaked profiles with separations of ∼ 700 km/s. These spectroscopic characteristics indicate that this object is likely a dwarf nova in the Milky Way Galaxy, not a nova in M31. The double-peaked line profiles suggest that this object has a large inclination angle (i.e., edge-on). Assuming the possible counterpart of g = 22.32 in the PS1 catalog is the progenitor, its amplitude is around 7 mags. Such a large amplitude suggests this dwarf nova as a WZ Sge-type. | 2021-10-11 00:27:00 | optical,cataclysmic variable,nova,transient,variables | 2021-10-11 | 00:27:00 | 1,411 | [
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] | 14,960 |
14,963 | Prediscovery detection of AT 2021aaxp, the galactic dwarf nova in the field of M31 | A. Horti-David, K. Sarneczky, J. Vinko (Konkoly Obs.) | We report a prediscovery detection of AT 2021aaxp, aka PNV J00444033+4113068 discovered by K. Itagaki on 2021-10-09.4579 then independently by D. Balam (DAO/NRC), C. E. Spratt (Ret), P. Langill (U of Calgary) and D. Green (CBAT) on 2021-10-09.6125. It was classified as a galactic dwarf nova in the direction of M31 by K. Taguchi and H. Maehara (ATel #14962). Our data were taken by the 0.6/0.9m Schmidt telescope equipped with a 10560x10560 STA 1600LN CCD at Piszkesteto Station of Konkoly Observatory, Hungary on 2021-10-08.85 UT and 2021-10-09.77 UT. The total exposure time was 900 seconds. Each night 15 unfiltered frames covering the 9 deg^2 field-of-view were collected and median-combined to get the final image. AT 2021aaxp was found as a bright source on the difference image taken on 2021-10-09.77 UT using the combined frame taken on 2021-07-28 with the same telescope and setup, as a template. We estimate its brightness as 15.72 +/- 0.02 mag (unfiltered) tied to r-band photometry of local PS1 stars. The transient was also detected on the previous night, 2021-10-08.85 UT at 20.26 +/- 0.10 mag. Its rapid rise, 4.5 mag in ~1 day, is consistent with the classification as a dwarf nova. | 2021-10-11 02:46:00 | optical,cataclysmic variable,nova,star,transient,variables | 2021-10-11 | 02:46:00 | 1,199 | [
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14,964 | INTEGRAL/JEM-X sees a bright X-ray flare from IGR J17391-3021 | Amanda Schriver Maartensson, Jerome Chenevez, Soeren Brandt, Niels Lund, Carol Anne Oxborrow, Ib Lundgaard Rasmussen, Niels Joergen Westergaard, Carl Budtz-Joergensen (DTU Space, Denmark), and Erik Kuulkers (ESA/ESTEC, The Netherlands) on behalf of the INTEGRAL Galactic Bulge monitoring team | The X-ray source IGR J17391-3021 (= XTE J1739-302) is detected by the INTEGRAL/JEM-X instrument at about 7 sigmas (for a total effective source exposure of 18.5 ksec) during the latest observation of the Galactic Bulge performed by INTEGRAL during revolution 2418 on October 3, 2021 between UTC 12 and 19. Closer analyses of the JEM-X data reveal a short brightening from this source known as a supergiant fast X-ray transient (SFXT) during the satellite pointing 2418-078 taken between UTC 15:07 and 16:06. The average fluxes measured in the 3-10 keV and 10-25 keV images are 48 +/-5 mCrab and 80 +/-10 mCrab, respectively. Outside this time window, the source is not seen and the 3-sigma upper limits are 10 mCrab. The X-ray flare lasts about 23 minutes with a 3-25 keV peak of 0.25 Crab at UTC 15:21.
A similar flare from this SFXT was detected on 2020 July 9 by MAXI/GSC (Negoro et al. ATel #13871). The latest outburst from IGR J17391-3021/XTE J1739-302 was reported by Swift in 2012 (Romano et al. ATel #4366). | 2021-10-11 18:01:00 | x-ray,transient | 2021-10-11 | 18:01:00 | 1,017 | [
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] | 14,962 |
14,965 | Swift-XRT detection of the candidate white dwarf pulsar ZTF J185139.81+171430.3 | Noel Klingler (NASA Goddard Space Flight Center / University of Maryland Baltimore County), George Pavlov (Pennsylvania State University) | ZTF J185139.81+171430.3 = ZTF18abnbzvx (hereafter, J1851) is a candidate white dwarf (WD) pulsar exhibiting optical (R- and G-bands) pulsations with a ~0.8 magnitude amplitude at a period P=742.173(3) s (Kato & Kojiguchi 2021; arXiv:2107.09913). Swift observed J1851 on 2021-08-15 (for 0.85 ks) and again on 2021-08-29 (for 2.07 ks; total exposure ~2.9 ks). The count rates in the UVOT B- and UVW1-bands were too low to resolve the sinusoidal variations seen in the (ZTF) R- and G-bands with the above exposure. However, significant X-ray emission from J1851 was detected with the XRT, which collected 51 +/- 7 net counts in the 2.9 ks exposure (PC mode). The X-ray spectrum can be described by an absorbed power-law model, with N_H ~< 1e21 cm^-2 and Gamma = 0.9 +/- 0.4, with a corresponding observed flux (0.3-10 keV) F_X = (1.5 +/- 0.5) * 10^-12 erg cm^-2 s^-1. At the object's distance d ~ 3.1 kpc (parallax = 0.325(119) mas; Gaia Collaboration 2021), the flux corresponds to an X-ray luminosity L_X = (1.7 +/- 0.6) * 10^33 erg/s. This is a factor of ~400 more luminous than the WD pulsar AR Sco (L_X ~ 4 * 10^30 erg/s). | 2021-10-12 12:50:00 | optical,x-ray,pulsar | 2021-10-12 | 12:50:00 | 1,124 | [
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] | 14,963 |
14,966 | Discovery of 9 ASAS-SN Supernova Candidates | J. Brimacombe (Coral Towers Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand), G. Bock (Runaway Bay Observatory, Australia), P. Pearl (The Gap Observatory, BOSS), 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) | 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. | 2021-10-13 05:02:00 | optical,supernovae,transient | 2021-10-13 | 05:02:00 | 1,604 | [
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] | 14,964 |
14,967 | An outburst of Comet 4P/Faye | Zhong-Yi Lin (IANCU), Michael S. P. Kelley (U. Maryland), Wing-Huen Ip (IANCU) | We report the discovery of an outburst of comet 4P/Faye from SLT (40cm telescope) at Lulin Observatory and Zwicky Transient Facility (ZTF) at Palomar Observatory. The outburst was observed to begin on 2021 August 26 with its brightness suddenly increasing by ~ 1.0 mag (Johonson-Cousins R filter, effective central wavelength 634.9nm, FWHM 106.56 nm) within 4 days, as measured through a radius of 10,000 km. Ten days after the outburst, with comet 4P/Faye near perihelion, the brightness appeared to have returned to a quiescent level that was brighter by 0.4 mag than that measured before the outburst. ZTF images taken September 4 through 16 show a slow moving cloud of debris traveling in the anti-solar direction. Photometry was calibrated to the PS1 catalogue and measured with the same aperture radius (10,000 km). | 2021-10-13 17:51:00 | optical,comet,transient | 2021-10-13 | 17:51:00 | 821 | [
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] | 14,965 |
14,968 | MAXI/GSC detection of X-ray brightening from V4641 Sgr | H. Negoro, M. Nakajima (Nihon U.), T. Mihara (RIKEN), K. Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, K. Komachi, 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. Ishikawa, M. Tominaga, T. Nagatsuka, T. Kurihara (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, Y. Goto, R. Uematsu (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) | The MAXI/GSC nova alert system triggered on X-ray brightening from the black hole binary V4641 Sgr on October 4, 8, and 12, 2021. The brightening has started around MJD 59430 (August 4, 2021). The 2-10 keV X-ray flux has been gradually increasing, and reached about 20 mCrab on October 12. This is the 7th detection of the outbursts from V4641 Sgr with MAXI/GSC since 2009. The last outburst was observed from January to February in 2020 (MJD 58853-58970) with a peak flux of about 60 mCrab in the 2-10 keV band (also see ATel #13431, #13437, #13443, #13471, #13547). Followup observations are encouraged. | 2021-10-13 20:24:00 | x-ray,binary,black hole,nova,transient | 2021-10-13 | 20:24:00 | 605 | [
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] | 14,966 |
14,969 | Photometric Follow-up of the Cataclysmic Variable AT 2021aaxp = J00444033+4113068 | D. D. Balam (DAO/NRC), C. E. Spratt (Ret), P. Langill (U of Calgary) and D. W. E. Green (CBAT) | We report follow-up photometry of 2021aaxp = J00444033+4113068, discovered by K. Itagaki on 2021-10-09.4579 then independently by the above authors on 2021-10-09.6125. Spectroscopic classification by K. Taguchi and H. Maehara (ATel #14962) showed the object to be a foreground cataclysmic variable star in the field of M31. Our observations were obtained during the course of a systematic survey for optical transients in local group galaxies using the 0.76-m (f/1) Baker-Nun Schmidt telescope at the Rothney Astrophysical Observatory (University of Calgary, Canada). The detector is located at the prime focus and is a FLI Microline CCD (4096 x 4096) with 16803 chip with plate scale of 3".92/pixel that covers an area of nearly 20 degrees squared. The CCD is un-filtered, however, the CCD QE function is similar to the response curve of the Gaia G band filter. Differential magnitudes of 2021aaxp were measured, using the nearby star 2MASS J00444678+4112226 (G (Gaia) = 14.66, Gaia DR2) as a secondary standard star. Using a 43 second of arc diameter aperture we find the following magnitudes: UT 2021 Oct. 9.261 (exposure 900 seconds) G = 17.68 (+/- 0.07), UT Oct. 12.311 (exposure 1200 seconds) G = 16.71 (+/- 0.06) and UT Oct. 13.306 (exposure 1200 seconds) G = 16.94 (+/- 0.05). | 2021-10-14 06:16:00 | optical,cataclysmic variable,star,transient,variables | 2021-10-14 | 06:16:00 | 1,284 | [
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] | 14,967 |
14,970 | Spectroscopic classification of AT2021aasl/ZTF21acgumnf | Stephanie Figuereo, Kevin McKinnon, Rafael Nunez, Puragra Guhathakurta (UCSC), Monika Soraisam (NOIRLab), Chien-Hsiu Lee (NOIRLab) | We report the spectroscopic observation of the following transient from the SALVATION project (ATel #13952). It was flagged from the ZTF public alert stream by the ANTARES alert-broker. The spectrum was obtained on 2021 October 13 UT with the Kast double spectrograph on the Shane 3-m telescope at Lick Observatory. | 2021-10-14 09:51:00 | optical,supernovae,transient | 2021-10-14 | 09:51:00 | 315 | [
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] | 14,968 |
14,971 | INTEGRAL, NICER and Swift confirm the re-brightening of V4641 Sgr | Motta, S. (INAF-OAB), Kuulkers, E. (ESA/ESTEC), Sanchez-Fernandez, C., Kajava, J. J. E. (ESA/ESAC), Gendreau, K., Arzoumanian, Z. (NASA/GSFC), Belloni, T. (INAF-OAB), Sanna, A. (University of Cagliari), Ferrigno, C. (ISDC/University of Geneva) | V4641 Sgr (SAX J1819.3â2525 = XTE J1819-254) is a nearby (~6.6 kpc) black hole X-ray binary discovered in 1999, when it underwent a bright and short outburst (see, e.g., Wijnands & van der Klis 2000, ApJ 528, L93). V4641 Sgr remained in quiescence ever since, save from sporadic mild re-brightenings. On 12 October 2021 the MAXI alert system detected flares from a position consistent with that of V4641 Sgr (Atel #14968), which suggested that the source might be entering a new outburst phase.
In a pointed Swift/XRT observation starting on 14 October at 01:27 UT (exposure ~960 sec), we detected V4641 Sgr at a position of RA, Dec (J2000.0): 18h 19m 21.6s, -25d 24m 25.0s (estimated 90% uncertainty radius: 3.5 arcsec). This is ~0.8 arcsec away from the source nominal optical position. We therefore confirm that the new transient detected by MAXI is indeed V4641 Sgr, possibly entering a new outburst. The 0.6-10 keV flux is ~6.9E-10 erg/cm2/s during the observation. The X-ray spectrum can be preliminarily described by an absorbed power-law with Gamma ~1.7 and NH ~ 4.3E+21/cm2.
INTEGRAL pointed at V4641 Sgr from 13 October 17:32 to 14 October 08:41. Preliminary analysis shows that the source is detected at approximately 18 mCrab in the JEM-X 3-10 keV band, which confirms the Swift results.
NICER pointed at the target from 13 October 15:40 to 16:10 (UT) and detected it at a flux ~5.2E-10 ergs/cm2/s in the 0.6 to 10 keV band, consistent with what was seen by Swift and INTEGRAL. The NICER spectrum shows a clear emission line at ~6.8 keV, which we tentatively associate with a blue-shifted Iron K-alpha line. No significant variability was observed in the ~550s observation.
Multi-wavelength observations are strongly encouraged.
We thank the INTEGRAL, NICER and Swift teams for promptly scheduling the observations. | 2021-10-14 16:27:00 | optical,x-ray,binary,black hole,transient | 2021-10-14 | 16:27:00 | 1,834 | [
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] | 14,969 |
14,972 | 0.4m LCOGT observations of the 2021 outburst of RS Oph | J. Ricra (Observatorio Astronomico AFARI), J. Vannini (Asociacion Nicaraguense de Astronomos Aficionados) and N. O. Baella (Instituto Geofisico del Peru) | On August 8, 2021, a new outburst of the nova RS Oph was discovered by Alexandre Amorim, Eddy Muyllaert and Keith Geary (AAVSO Alert Notice 752). RS Oph is a cataclysmic variable belonging to a small subgroup of novae called recurrent novae (of which there are only 7 confirmed members).
This object is also classified as a symbiotic binary system which contain a white dwarf that is remarkably close to the Chandrasekhar limit, therefore, it is a strong candidate for being a SNIa.
We report photometric measurements of this new outburst gathered with two twin 0.4m telescopes belonging to the LCOGT, in the Johnson (B and V) and SDSS (g', r', i' and z') bands. The observations were made from Siding Spring Observatory (Australia) on the nights of August 28 (with kb24 instrument), September 2 (with kb88 instrument) and September 7 (with kb24 instrument), approximately 20, 25 and 30 days after the outburst, respectively.
In the three nights of observation, the same setup was used for the exposure times: 6 sec (V), 22 sec (B), 7 sec (g'), 4 sec (r'), 12 sec (i') and 22 sec (z'). The Astrosource software (Fitzgerald et al. 2021) and APASS DR10 catalog used for the photometric calibration process.
Table 1 shows the values obtained (without reddening correction), in addition an image of the observed field can be seen here.
This work makes use of observations from the Las Cumbres Observatory Global Telescope Network (LCOGT).
Table 1 DATE HJD Filter N images Mag 2021-08-28 2459455.98361 B 13 8.809+/-0.002 2459455.98409 V 13 8.222+/-0.001 2459455.98331 g' 13 8.235+/-0.001 2459455.98303 r' 13 6.615+/-0.001 2459455.98276 i' 13 7.166+/-0.001 2459455.98221 z' 13 6.215+/-0.001 2021-09-02 2459459.92085 B 10 9.117+/-0.003 2459459.92133 V 10 8.525+/-0.003 2459459.93899 g' 10 8.533+/-0.003 2459459.93871 r' 10 6.895+/-0.001 2459459.93843 i' 10 7.464+/-0.002 2459459.93788 z' 10 6.507+/-0.005 2021-09-07 2459464.93434 B 14 9.509+/-0.002 2459464.92602 V 14 8.985+/-0.001 2459464.92842 g' 14 8.913+/-0.002 2459464.93386 r' 14 7.152+/-0.001 2459464.94932 i' 14 7.865+/-0.002 2459464.95213 z' 14 6.77+/-0.02 | 2021-10-15 15:09:00 | optical,binary,cataclysmic variable,nova,variables | 2021-10-15 | 15:09:00 | 2,114 | [
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] | 14,970 |
14,973 | V and Rc photometry of the candidate white dwarf pulsar ZTF J185139.81+171430.3 | Elena Pavlenko, Aleksei Sosnovskij (Crimean Astrophysical Observatory RAS) | ZTF J185139.81+171430.3 (hereafter J1851) is a candidate white dwarf pulsar, as was suggested by Kato & Kojiguchi (2021). They found large-amplitude (~0.8 magnitude) coherent variations with a very short (0.00858995(3) d) period by using ZTF observations in the interval of BJD 2458646-2458746. Significant X-ray emission from this object was detected by Swift-XRT on August 15 and 29 (Klingler and Pavlov, ATel 14965). We observed J1851 in primary focus of the Shajn 2.6-m telescope of the Crimean Astrophysical Observatory on August 6 in V and Rc bands. During of BJD 2459433.29230-2459433.40455, 58 brightness estimates were obtained in each band. We have registered a period of 0.00852(7) d, which, within the accuracy, coincides with the period found by Kato & Kojiguchi. The V and Rc data folded on the period of 0.00852 d are shown in Figure . The mean amplitude in the Rc and V bands is 0.6 and 0.5 magnitude respectively. | 2021-10-15 21:07:00 | optical,x-ray,binary,cataclysmic variable,pulsar,star,variables | 2021-10-15 | 21:07:00 | 930 | [
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] | 14,971 |
14,974 | RS Oph - disappearance of the optical flickering | R. Zamanov, K. Stoyanov, A. Kostov, S. Boeva, M. Moyseev (Institute of Astronomy and NAO, Bulgarian Academy of Sciences), J. Marti, P. L. Luque-Escamilla (Universidad de Jaen, Spain) | CCD photometry of the recurrent nova RS Oph has been performed with the 50/70 cm Schmidt telescope of the Rozhen National Astronomical Observatory (Bulgaria) and the 41 cm telescope at the Observatory of the University of Jaen (Spain) on 2021 September 2, October 4 and October 7. We have not detected flickering on minute-to-hour time scale with amplitude greater than 0.05 mag. At quiescence RS Oph exhibits variability on minute-to-hour time scale with amplitude 0.2-0.3 mag in B band. The flickering disappeared after the 2006 outburst and was first detected 240 days later (Worters et al. 2006, MNRAS, 379, 1557). The cessation of the flickering in our latest observations, indicates that the accretion disc around the white dwarf is destroyed by the 2021 nova outburst. For our understanding of the disc-flickering connection in the symbiotic binaries, it will be important to follow the UBV bands and to detect when and how the flickering will re-appear. [Acknowledgments: projects KP-6-H28/2 and AEI 501100011033] | 2021-10-15 21:58:00 | optical,binary,cataclysmic variable,nova,variables | 2021-10-15 | 21:58:00 | 1,021 | [
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] | 14,972 |
14,975 | Spectroscopic classification of AT2021aagy/ZTF21acernhn | Stephanie Figuereo, Kevin McKinnon, Rafael Nunez, Puragra Guhathakurta (UCSC), Monika Soraisam (NOIRLab), Chien-Hsiu Lee (NOIRLab) | We report the spectroscopic observation of the following transient from the SALVATION project (ATel #13952). It was flagged from the ZTF public alert stream by the ANTARES alert-broker. The spectrum was obtained on 2021 October 14 UT with the Kast double spectrograph on the Shane 3-m telescope at Lick Observatory. | 2021-10-16 05:39:00 | optical,supernovae,transient | 2021-10-16 | 05:39:00 | 315 | [
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] | 14,973 |
14,976 | MASTER OT J013318.91+305213.7 - possible microlensing event in M33 | K. Zhirkov, V. Lipunov, V. Kornilov, E. Gorbovskoy, N. Tyurina, P. Balanutsa, A. Kuznetsov, D. Vlasenko, Ya. Kechin, D. Zimnukhov, V. Vladimirov, V. Senik, A. Chasovnikov, V. Topolev, T. Pogrosheva, D. Cheryasov (Lomonosov Moscow State University, SAI, PhysicsDepartment), O. A. Gres, N. M. Budnev (Irkutsk State University, API), C. Francile, R. Podesta, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V. Yurkov (Blagoveschensk Educational StateUniversity) | MASTER OT J013318.91+305213.7 detection - possible microlensing event
MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 01h 33m 18.91s +30d 52m 13.7s on 2021-10-11.82150 UT in regular survey operations. The OT unfiltered magnitude is 19.4m (mlim=20.2). The OT is seen in 20 images ( 2021-10-06 16:24:04 2021-10-15 19:56:29 ). There is no minor planet at this place. We have reference image on 2011-09-22.05760 UT with unfiltered mlim= 20.2m. Spectral observations are required. The transient is also detected in the ATLAS (Tonry et al. , 2018, PASP, 130f4505T; Smartt et al. 2016 APJL, 827, 40) data https://fallingstar-data.com/forcedphot/queue/123132/plot.pdf Spectral bservations and photometry are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/013318.91305213.7.png | 2021-10-16 23:07:00 | optical,microlensing event,planet,transient,variables,request for observations | 2021-10-16 | 23:07:00 | 932 | [
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] | 14,974 |
14,977 | Prediscovery photometry of the M33 microlensing event candidate AT 2021abdj | Filipp Romanov (amateur astronomer, Russia) | I observed the field of galaxy M33 remotely using 0.61-m f/6.5 corrected Dall-Kirkham robotic telescope (Lane, 2018, RTSRE, 1, 119) of Burke-Gaffney Observatory (Saint Mary's University in Halifax, Nova Scotia, Canada). The 900 seconds exposure images were taken between 2021-09-14 and 2021-10-16 through Astrodon Luminance (UV/NIR blocking) filter. All these images clearly show the object reported in ATel #14976. I measured its magnitude comparing to V-band magnitudes of nearby stars from Massey et al. (2016, AJ, 152, 62):
Dates are indicated in UTC and for the middle of the exposures. | 2021-10-17 20:08:00 | optical,microlensing event,nova,star | 2021-10-17 | 20:08:00 | 592 | [
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] | 14,975 |
14,978 | MASTER OT J005444.54-591917.3 - very bright 7 magnitude amplitude OT on a high galactic latitude | K. Zhirkov, V. Lipunov, V. Kornilov, E. Gorbovskoy, N. Tyurina, P. Balanutsa, A. Kuznetsov, D. Vlasenko, Ya. Kechin, D. Zimnukhov, V. Vladimirov, V. Senik, A. Chasovnikov, V. Topolev, T. Pogrosheva, D. Cheryasov (Lomonosov Moscow State University, SAI, PhysicsDepartment), O. A. Gres, N. M. Budnev (Irkutsk State University, API), C. Francile, R. Podesta, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V. Yurkov (Blagoveschensk Educational StateUniversity) | MASTER-OAFA (Argentina) auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source AT2021abqn at (RA, Dec) = 00h 54m 44.54s -59d 19m 17.3s on 2021-10-16.19806 UT. Galactic latitude b=-57.8d
The OT magnitude in 'Clear' filter is 14.8m (mlim = 18.4).
The OT is seen in 12 images over the course of 2 hours. There is no minor planet at this place.
We have reference image on 2016-12-25.10618 UT with 'Clear' filter limiting magnitude 19.7m.
Spectral observations are required. | 2021-10-17 20:13:00 | optical,cataclysmic variable,planet,transient,variables | 2021-10-17 | 20:13:00 | 543 | [
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] | 14,976 |
14,979 | MAXI/GSC detection of a new X-ray transient MAXI J1735-272 | H. Negoro, K. Seino, M. Nakajima, K. Kobayashi, K. Asakura (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, K. Komachi, 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. Ishikawa, 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) | The MAXI/GSC nova alert system triggered on a faint X-ray transient source at 06:22 UT on 2021 October 17. Assuming that the source flux was constant over 7 transits from 04:49 to 18:46 on October 17, we obtain the source position at (R.A., Dec) = (263.766 deg, -27.231 deg) = (17 35 03, -27 13 51) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.40 deg and 0.37 deg, respectively. The roll angle of the long axis from the north direction is 0.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scans was 30 +- 7 mCrab (4.0-10.0keV, 1 sigma error). Currently, the 4-10 keV flux tends to decrease. The source is near the Galactic Center (l, b)=(0.2 deg, 2.9 deg). The position is, however, far from known bright X-ray sources, i.e., 0.56 arc-degree away from the X-ray transient IGR J17329-2731 (Postel et al ATel. #10644), and 0.75 arc-degree from SXL 1735-269. We, therefore, tentatively name the source MAXI J1735-272. Followup observations are encouraged. | 2021-10-18 11:11:00 | x-ray,black hole,neutron star,nova,star,transient,request for observations | 2021-10-18 | 11:11:00 | 1,090 | [
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] | 14,977 |
14,980 | Fermi-LAT detection of enhanced gamma-ray activity from the FSRQ source TXS 0646-176 | Giovanni La Mura (LIP) | 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 TXS 0646-176, also known as 4FGL J0648.4-1743 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with radio coordinates R.A. = 102.1187437 deg, Decl. = -17.7348444 deg (J2000; Petrov et al. 2006, AJ, 131, 1872), and redshift z=1.232 (Murdoch et al. 1984, PASA, 5, 341).
Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on 2021 October 14, with a daily averaged gamma-ray flux (E>100MeV) of (3.4 +/- 0.3) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only), and a photon index of 2.3 +/- 0.1. This is slightly below the highest LAT daily flux ever observed for this source (ATel #12327). The high state persisted on 2021 October 15, with a daily averaged gamma-ray flux (E>100MeV) of (3.3 +/- 0.3) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 60 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL). The corresponding photon index is 2.0 +/- 0.1, and is significantly smaller than the 4FGL value of 2.45 +/- 0.03. Previous flaring episodes were reported in ATel #7833, #11706, #12327 and #14786.
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 S. Ciprini (stefano.ciprini@ssdc.asi.it).
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. | 2021-10-18 14:43:00 | radio,gamma ray,agn,blazar,quasar | 2021-10-18 | 14:43:00 | 2,127 | [
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14,981 | AGILE detection of gamma-ray flaring activity from the FSRQ TXS 0646-176 | C. Pittori, F. Lucarelli (SSDC and INAF/OAR), A. Bulgarelli (INAF/OAS-Bo), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), V. Fioretti, N. Parmiggiani, A. Addis, L. Baroncelli, A. Di Piano (INAF/OAS-Bo), F. Verrecchia (SSDC and INAF/OAR), G. Piano, A. Ursi, M. Cardillo, C. Casentini, E. Menegoni, L. Foffano (INAF/IAPS), S. Vercellone (INAF/OA-Brera), 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) | AGILE is detecting enhanced gamma-ray activity above 100 MeV from the FSRQ TXS 0646-176 (also known as 5BZQJ0648-1744, 4FGL J0648.4-1743) with radio coordinates R.A. = 102.1187437 deg, Decl. = -17.7348444 deg (J2000), at redshift z=1.232. Integrating from 2021-10-16 UT 04:50:00 to 2021-10-18 UT 04:50:00, a preliminary multi-source maximum likelihood analysis yields a detection above 6 sigma and a flux F(>100 MeV) = (3.8 +/- 1.0) x 10^-6 photons/cm^2/s. The source is being detected by AGILE since 2021-10-14 at a level above 4 sigma, while it was not detected during the previous months.
Enhanced gamma-ray activity from TXS 0646-176 has been recently reported by Fermi (ATel # 14980). The source is not included in any AGILE/GRID catalogue.
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 TXS 0646-176 are strongly encouraged. | 2021-10-18 19:24:00 | radio,gamma ray,agn,blazar | 2021-10-18 | 19:24:00 | 1,097 | [
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] | 14,979 |
14,982 | S-CUBED confirmation of 22.3 day orbital period of XMMU J010429.4-723136 / SXP 164 | Jamie A. Kennea (Penn State), Malcolm J. Coe (Southampton) and Phil A. Evans (Leicester) | The BeXRB XMMU J010429.4-723136 was recently reported by Carpano et al (arXiv:2106.14536) to have a 164s pulsar period in eROSITA observations, and was therefore named SXP 164. We note that this source was previously erroneously known as SXP 707 (ATEL #3154), however the 707s period was in fact the dithering period of Chandra (ATEL #5674).
Carpano et al. also report a new analysis of OGLE data, reporting the detection of a 22.35+/-0.11 day period, which they suggest to be the orbital period of SXP 164.
We have analyzed over 5 years of data from S-CUBED, the Swift SMC Survey (Kennea et al, 2018), in order to search for any signature of this orbital period in X-ray data. We note that although S-CUBED has a weekly cadence, the long baseline of observations make detection of relatively short orbital periods possible.
Performing a Lomb-Scargle analysis on the S-CUBED X-ray data searching over periods in the range 7 to 100 days, we the detect strongest a peak in the periodogram to be at 22.34 days, with a false alarm probability of 0.02%.
This period is in good agreement with the OGLE measured value reported by Carpano et al. The detection of this period in S-CUBED data is likely the signature of repeated Type I outbursts from this BeXRB, which are expected to repeat once per orbit. Therefore we confirm the 22.3 day orbital period of SXP 164 reported by Carpano et al. | 2021-10-18 22:53:00 | x-ray,binary,neutron star,pulsar,star | 2021-10-18 | 22:53:00 | 1,388 | [
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] | 14,980 |
14,983 | Swift non-detection of MAXI J1735-272 | A. Bahramian (Curtin), J. A. Kennea (PSU), P. A. Evans, A. P. Beardmore (U Leicester), H. A. Krimm (CRESST/GSFC/USRA), P. Romano (INAF-IASFPA), K. Yamaoka (Nagoya U.), M. Serino (RIKEN), H. Negoro (Nihon U.) | Following detection of the new transient MAXI J1735-272 by MAXI/GSC (ATel #14979), we performed a set of 7 tiling observations with the Neil Gehrels Swift observatory (performed between 2021-10-18 16:57:35 and 2021-10-18 18:50:28 UT, Obs IDs 00014871001, 00014872001, 00014873001, 00014874001, 00014875001, 00014876001, 00014877001). These observations cover a radius of up to 0.55 degree around the reported localization by ATel #14979, thus fully covering the uncertainty ellipse.
We detect no significant X-ray source in these XRT observations, indicating that the transient may have declined rapidly. | 2021-10-19 09:01:00 | x-ray,transient | 2021-10-19 | 09:01:00 | 605 | [
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] | 14,981 |
14,984 | Small Outburst of Comet 29P/Schwassmann-Wachmann 1 | Kritti Sharma (IITB), Michael S. P. Kelley (U. Maryland), Tim Lister (Las Cumbres Observatory), Vishwajeet Swain (IITB), Harsh Kumar (IITB), Varun Bhalerao (IITB), G. C. Anupama (IIA), Sudhanshu Barway (IIA) on behalf of the GROWTH-India, Zwicky Transient Facility and LCO Outbursting Objects Key Project Collaborations | We report observations of an outburst of Comet 29P/Schwassmann-Wachmann 1 discovered by Miles et al. (MISSION 29P). The epoch averaged photometry has been computed within a 5â aperture and is calibrated against PanSTARRS PS1 data release (Flewelling et al., 2018). The comet had brightened by -0.21+/-0.06 mag between the two r band images taken by GROWTH-India Telescope (GIT) on 2021 Oct. 16.879 and Oct. 16.948 UTC. This event was confirmed with observations from Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002) and Las Cumbres Observatory (LCO) 1-m telescopes at Tenerife Observatory (Z24, Z31). The comet had an apparent brightness of r=14.49+/-0.03 mag in LCO data taken on 2021 Oct. 17.026 UTC and r=14.57+/-0.02 mag in ZTF data taken on 2021 Oct. 17.467 UTC. The mean colours of the comet are g-r=0.56 and r-i=0.24, as measured using ZTF data outside of this event. The data are tabulated below along with heliocentric distance (rh) and observer-comet distance (delta).
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/
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 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, 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. | 2021-10-19 13:05:00 | optical,comet,transient | 2021-10-19 | 13:05:00 | 2,250 | [
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] | 14,982 |
14,985 | INTEGRAL hard X-ray non-detection of the new transient MAXI J1735-272 | V. Sguera (INAF-OAS Bologna, Italy), L. Sidoli (INAF-IASF Milano, Italy) | The sky region of the X-ray transient MAXI J1735-272, recently discovered by MAXI/GSC on 17 October 2021 (ATel #14979), was covered by INTEGRAL public ToO observations of 4U 1820-30 carried out from 17 October 2021 at 11:23 to 18 October 2021 03:02 (UTC). MAXI J1735-272 was not detected by IBIS/ISGRI in the energy band 25-60 key (2.3 ks on-source exposure), the derived 3 sigma upper limit is about 13 mCrab or 1.1 x 10 -10 erg cm-2 s-1. This could indicate a very short decay time for the new transient, as suggested by Swift follow-up as well (ATel #14983). In addition, we note that the closest source to MAXI J1735-272 detected by IBIS/ISGRI above 20 keV is SLX 1735-269, located about 16 arcminutes outside the MAXI uncertainty ellipse. | 2021-10-20 01:42:00 | x-ray,transient | 2021-10-20 | 01:42:00 | 743 | [
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] | 14,983 |
14,986 | Spectroscopic Classifications of Optical Transients with the Lick Shane Telescope | K. W. Davis, 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. All observations were made on 2021 Oct 16 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 Si II 6355 velocity of -11,300 km/s. (2) We measure a H-alpha FWHM velocity of 1,300 km/s. Using a Tully-Fisher distance modulus to the host galaxy, MGC -02-11-023, of 35.69 mag (Theureau et al., 2007, A&A, 465, 71) and correcting for Milky Way extinction, the current absolute magnitude is M_r = -16.8 mag and rising. This is at the low end of the peak luminosity distribution of SNe IIn and the H-alpha line is relatively narrow, perhaps indicating that AT2021aapa is a non-terminal LBV eruption (i.e., a âsupernova impostor"). (3) We measure a Si II 6355 velocity of -11,100 km/s. | 2021-10-20 12:21:00 | optical,supernovae,transient | 2021-10-20 | 12:21:00 | 1,088 | [
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] | 14,984 |
14,987 | Swift follow-up observations of the flaring blazar TXS 0646-176 | F. D'Ammando (INAF-IRA Bologna) | Following the gamma-ray flaring activity from the flat spectrum radio quasar TXS 0646-176 observed by Fermi-LAT and AGILE-GRID (ATel #14980, ATel #14981), Swift target of opportunity observations were performed on 2021 October 18.
Swift/XRT data were taken in Photon Counting mode for a net exposure of about 2.6 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 = 2.37 x 10^21 cm^-2, Ben Bekhti et al., 2016, A&A, 594, A116) and a photon index of 1.25 +/- 0.15. The corresponding observed 0.3-10 keV flux is (9.4 +/- 0.9)e-12 erg cm^-2 s^-1. By comparison, the (observed) 0.3-10 keV flux estimated in the previous XRT observations performed between 2018 December 3 and 28 (at the time of a previous gamma-ray flaring activity observed by Fermi-LAT, ATel #12327) ranges between (5.2-9.1)e-12 erg cm^-2 s^-1. This indicates an increase of the X-ray activity in 2021 October, in agreement with the observed gamma-ray flaring activity.
Simultaneous Swift/UVOT observations were performed on 2021 October 18. The observed magnitudes are V = 18.09 +/- 0.22, B = 18.91 +/- 0.18, U = 18.56 +/- 0.19, W1 = 19.15 +/- 0.24, M2 = 19.82 +/- 0.29, and W2 > 20.12. The observed magnitudes on 2018 December 3 are V = 17.97 +/- 0.15, B = 18.80 +/- 0.14, U = 18.49 +/- 0.15, W1 = 19.23 +/- 0.24, M2 > 19.96, and W2 > 20.38, comparable to the values observed on 2021 October 18 within the uncertainties. Upper limits are estimated if the source is detected with a significance < 3-sigma.
In consideration of the ongoing activity of this source, we encourage multi-wavelength observations. Further observations with Swift and NICER are planned in the next days.
We would like to thank the Swift Team, Observatory Duty Scientists, and PI for making these observations possible. | 2021-10-20 16:45:00 | radio,optical,ultra-violet,x-ray,gamma ray,agn,black hole,blazar,quasar | 2021-10-20 | 16:45:00 | 1,887 | [
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] | 14,985 |
14,988 | The optical flickering from MWC 560 is still missing | R. Zamanov, K. Stoyanov, V. Marchev (Institute of Astronomy and NAO, Bulgarian Academy of Sciences), D. Marchev, T. Atanasova, N. Pavlova (Shumen University) | We performed photometric observations of the jet-ejecting symbiotic star MWC 560 in Sloan g' and r' bands with the 40 cm telescope of the Shumen University "Episkop K. Preslavski" Bulgaria (Kjurkchieva et al. 2020, BlgAJ, 32, 113). The observations show an absence of optical flickering with amplitude greater than 0.05 mag. The Table below lists the date of each observation, the band, the UT-start and UT-end of the run, the number of data points, the average brightness during the run (in magnitudes), the standard deviation of the brightness during the run, the upper limit of the peak-to-peak amplitude. DATE - BAND UTstart - UTend Npts average / sigma upper limit hh:mm hh:mm [mag] / [mag] [mag] 22 February 2021 g' 19:16 - 21:45 363 8.91 / 0.014 < 0.07 22 February 2021 r' 19:16 - 21:45 361 8.51 / 0.015 < 0.08 20 October 2021 g' 0:30 - 2:28 216 8.55 / 0.011 < 0.05 20 October 2021 r' 0:30 - 2:28 214 8.24 / 0.013 < 0.06 The flickering of MWC 560 was visible in all observations obtained between 1984 and May 2018 (e. g. Lucy et al. 2020, MNRAS,492, 3107). It disappeared in October 2018 (ATel #12227) and not detected since then. Most probably, the accretion disc is in an unusual state - very bright and stable. | 2021-10-20 20:19:00 | optical,binary,cataclysmic variable,star,variables | 2021-10-20 | 20:19:00 | 1,224 | [
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] | 14,986 |
14,989 | Detection of a new outburst from Cygnus X-3 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 has occurred from Cygnus X-3, about three months after the previous burst in 2021 July (ATel #14821). Using the Nasu telescope array, we obtained the first observation of the burst with a flux density of 0.71+-0.02 Jy on October 19 9:20 UT (MJD 59506.389) and the second one with 3.4+-0.02 Jy on October 20 9:16 UT (MJD 59507.386) at 1.4GHz.
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 with a field of view as wide as that of a 20 m dish.
Nasu telescope array HP: https://nasu-radio-telescope.space | 2021-10-21 17:08:00 | radio,binary,black hole,transient | 2021-10-21 | 17:08:00 | 762 | [
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14,990 | Search for counterpart to AMON IC_HAWC NuEm-211020A 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 alert NuEm-211020A (https://gcn.gsfc.nasa.gov/gcn3/30950.gcn3). No up-going muon neutrino candidate events were detected within 3 degrees from the coincidence coordinate over a time period [10h52 - 14h13 UT] corresponding to 55.8% of the HAWC transit time mentioned in the AMON notice, 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 located at the coordinates of the coincidence as reported by AMON, of about 15 GeV.cm^-2 over the energy range 4 TeV - 4 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and about 26 GeV.cm^-2 (750 GeV - 380 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 (45% visibility). ANTARES (https://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. | 2021-10-21 22:37:00 | tev,neutrinos,transient | 2021-10-21 | 22:37:00 | 1,439 | [
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14,991 | SRG/eROSITA observation of TXS 0646-176 during its gamma-ray flare | S. Haemmerich (Remeis-Observatory/ECAP), A. Gokus (Remeis-Observatory/ECAP & Uni Wuerzburg), I. Kreykenbohm (Remeis-Observatory/ECAP), A. Rau (MPE Garching), J. Wilms (Remeis-Observatory/ECAP) | The eROSITA telescope (Predehl et al. 2021, A&A 647, A1) on-board of Spectrum-X-Gamma (Sunyaev et al. 2021, arxiv:2104.1326) scanned the position of flaring FSRQ TXS 0646-176 (RA = 06:48:28.66, DEC = -17:44:04.07) as part of its fourth ongoing all-sky survey (eRASS4) during the state of enhanced gamma-ray activity detected by Fermi/LAT (La Mura, ATel#14980) and AGILE Pittori et al. , ATel#14981). The source was observed during eight consecutive passages, spaced 4h apart, between 2021 October 14 17:27 UTC and 2021 October 15 21:27 UTC, with a total exposure time of 273s. Therefore, the eROSITA data covers the same time frame as the gamma-ray flare. The instrument detected ~230 photons.
The X-ray spectrum of TXS 0646-176, during the flaring state is best described with an absorbed power-law (red. cash stat: 0.91). Fixing the equivalent neutral hydrogen column density along the line of sight to the value of N_H = 2.37 x 10^21 cm^(-2) (HI4PI Collaboration, N. Ben Bekhti, L. Floer, et al., 2016, A&A 594, A116), we find a photon-index of 1.26+/-0.23 and an observed absorbed flux (0.3-10.0 keV) of (9.8 +/- 1.2) x 10^-12 erg/cm^2/s. Between the individual scans the count rate remained stable with an average of (0.83 +/- 0.06) counts/s.
The X-ray properties are similar to the ones reported for a Swift/XRT observation (ATel #14987) that was conducted on 2021 October 18. Therefore, it seems that the blazar stayed in an enhanced X-ray state for a few days and that the X-ray properties did not change significantly over this time span.
TXS 0646-176 was also detected in the first three eROSITA all-sky surveys, during which the flux was always lower than in the current state. The previous fluxes (0.3-10.0 keV) are: 2020 April 13: (3.2 +/- 0.8) x 10^-12 erg/cm^2/s 2020 October 16: (2.7 +/- 0.8) x 10^-12 erg/cm^2/s 2021 April 12/13: (5.6 +/- 0.9) x 10^-12 erg/cm^2/s During all these observations no significant difference in spectral shape was seen (photon indices: eRASS1: 1.2 +/- 0.5, eRASS2: 1.2 +/- 0.6, eRASS3: 1.1 +/- 0.4).
Further multi-wavelength follow-up observations, especially by other X-ray facilities, are encouraged in order to study the long term behavior of the source after the flare. | 2021-10-22 00:18:00 | x-ray,gamma ray,agn,blazar | 2021-10-22 | 00:18:00 | 2,222 | [
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] | 14,989 |
14,992 | Further NICER observations of V4641 Sgr: spectral turn-over and iron emission lines | Douglas J. K. Buisson (Southampton), Joey Neilsen (Villanova), Sara Motta (INAF-OAB), Federico Vincentelli (Villanova), Tomaso Belloni (INAF-OAB), Erik Kuulkers (ESA/ESTEC), Andrea Sanna (University of Cagliari), Keith Gendreau, Zaven Arzoumanian (NASA/GSFC) | NICER has been monitoring the new outburst of V4641 Sgr following its detection by MAXI (ATel #14968) and confirmation with INTEGRAL, Swift, and NICER (ATel #14971). At the time of writing, 3 snapshots are available, from Oct 13,14,16, with effective exposures totaling 1500 s. The three spectra have similar shapes, though the overall brightness appears to be slightly lower on the 14th and slightly higher on the 16th.
In each spectrum, there is a strong roll-over at high energy relative to a simple power law. Fitting with a phenomenological cut-off power law gives a very hard index (~0.75) and low cut-off (~2.3 keV). A diskbb gives a similar quality of fit (chi^2_red=1.58 rather than 1.41 for 572/571 d.o.f. over 0.7-10 keV; both models give good continuum fits above 2keV), with T_in~1.3 keV, although the normalisation (~10) corresponds to a much lower luminosity than expected for a disc around a 6M_Sun black hole. For each of these models, the fitted nH~2*10^21 cm^-2. The observed 2-10 keV flux changes from 3.8*10^-10 erg s^-1 cm^-2 on Oct 13 to 3.5*10^-10 erg s^-1 cm^-2 on Oct 14 to 4.7*10^-10 erg s^-1 cm^-2 on Oct 16. During the more recent observations diskbb temperatures are slightly higher; fitting the diskbb model to the spectrum at energies >2.5 keV gives 1.27-0.04+0.03, 1.28-0.06+0.07, 1.37-0.03+0.03 keV, respectively.
There are also emission features in the X-ray spectrum, with the most prominent lines located in the iron K band. Stacking the data shows a double line shape, with peaks around 6.7 and 6.97 keV, corresponding to the alpha lines of Fe XXV and Fe XXVI. Modelling these with Gaussian emission lines gives XSPEC Norm*10^4=3.7+-0.8 (5.2+-1.0) and Sigma<0.09 (0.07) for Fe XXV (Fe XXVI). There is also a slight soft excess around 1 keV in the spectrum; similar features were observed in neutron star systems during states with very hard power-law illumination (Her X-1: Jimenez-Garate et al. 2002, ApJ, 578, 391; LMC X-4: Neilsen et al. 2009, ApJ, 696, 182; Ballantyne et al. 2012, ApJ, 747, L35).
Interestingly, despite variations in the underlying continuum, we do not find evidence of statistically significant changes in the emission lines. This may reflect the S/N in our brief snapshots or it may indicate evolution of the geometry or ionization of the emission line region.
Further NICER observations are planned; we encourage multi-wavelength follow-up.
NICER is a 0.2-12 keV X-ray telescope operating on the International Space Station. The NICER mission and portions of the NICER science team activities are funded by NASA. | 2021-10-22 00:57:00 | x-ray,binary,black hole,neutron star,star,the sun,transient | 2021-10-22 | 00:57:00 | 2,580 | [
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14,993 | DAMPE detection of enhanced gamma-ray activity from blazar TXS 0646-176 | Zun-Lei Xu (PMO), Kai-Kai Duan (PMO), Wei Jiang(PMO), Shi-Jun Lei (PMO), Xiang Li (PMO), Peng-Xiong Ma(PMO), Maria Munoz Salinas(UNIGE), Zhao-Qiang Shen (PMO), Meng Su (HKU/PMO), Qiang Yuan (PMO), Chuan Yue(PMO), Yi-Zhong Fan (PMO), Jin Chang (PMO), on behalf of the DAMPE collaboration | The DArk Matter Particle Explorer (DAMPE) has detected variable GeV gamma-ray emission from the blazar TXS 0646-176(J2000 coordinate R.A. = 102.11 deg, Dec. = -17.73 deg; Petrov et al. 2006, AJ, 131, 1872), also known as 4FGL J0648.4-1743. The DAMPE has recorded a significant increase in the number of photons positionally consistent with the source on 2021 October 17, and the daily averaged gamma-ray flux reached ~( 3.3+/-1.8) x10^-7 photons cm^-2 s^-1 above 2 GeV. Few photons were detected in the days before October 17, and the flux on October 15 is only half of the 17th, and no photons were detected after the 17th. The daily light curve shows significant variabilities. Enhanced activities of TXS 0646-176 was also reported at the gamma-ray bands by Fermi-LAT(ATel#14980) and X-ray bands by Swift(ATel#149807). DAMPE is a space-borne calorimeter detector of high energy cosmic rays and gamma-rays. The detectable energy range is ~2 GeV to 10 TeV for gamma-rays. More information about DAMPE can be found at http://www.space.pmo.cas.cn/. | 2021-10-22 19:12:00 | x-ray,gamma ray,tev,agn,blazar,cosmic rays,variables | 2021-10-22 | 19:12:00 | 1,047 | [
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14,994 | NICER Detection of a Transition to the Hard State in MAXI J1803-298 | J. F. Steiner (SAO, CfA), S. Ubach (SAO, CfA), J. A. Tomsick (UC Berkeley, SSL), B. Coughenour (UC Berkeley, SSL), J. Homan (Eureka Scientific) | MAXI J1803-298 is an X-ray binary system hosting a black-hole candidate which was detected in outburst by MAXI GSC on 2021 May 01 (ATel #14587). The first month after discovery presented an initial hard state rise and transition through intermediate and steep-power law states. Subsequently, over the last five months it has remained in a protracted, declining soft/thermal state. These phases of discovery and evolution have been described in numerous ATels discussing its X-ray, optical, or radio behavior (ATels #14588, #14589, #14591, #14594, #14597, #14598, #14601, #14602, #14606, #14607, #14609, #14613, #14627, #14629, #14630, #14650, #14660, #14706). In this update we report the discovery that transition to a faint hard state is presently underway. | 2021-10-23 00:55:00 | radio,optical,x-ray,binary,black hole,transient | 2021-10-23 | 00:55:00 | 759 | [
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] | 14,992 |
14,995 | Search for counterpart to IceCube-211023A 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-211023A (GCN #30957). The reconstructed origin was slightly above the horizon for ANTARES at the time of the alert (+0.8 degrees). No horizontal 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 half of the time. This leads to a preliminary 90% confidence level upper limit on the muon-neutrino fluence from a point source of about 12 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 48 GeV.cm^-2 (600 GeV - 300 TeV) for an E^-2.5 spectrum. A search over an extended time window of +/- 1 day has also yielded no detection (51% 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. | 2021-10-24 20:41:00 | tev,neutrinos,transient | 2021-10-24 | 20:41:00 | 1,270 | [
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] | 14,993 |
14,996 | MASTER OT J045237.07+851925.2 - bright optical counterpart of Fermi LAT/GBM GRB211023A | 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), O. A. Gres, 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 J045237.07+851925.2 discovery - optical counterpart of Fermi LAT/GBM GRB 211023A
MASTER Global robotic net (http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L) started FERMI GRB 211023A ( Fermi GBM team, GCN #30958, Ttrigger=13:05:43, Fermi LAT GCN #30961) errorbox inspect just after sunset at 2021-10-23 15:12:50 UT (Lipunov et al. GCN #30970 https://master.sai.msu.ru/site/master2/event.php?id=1762531).
MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source - changing optical counterpart of this GRB at (RA, Dec) = 04h 52m 37.07s +85d 19m 25.2s at 2021-10-23.65385 UT.
OT unfiltered magnitude at one of first images is 15.6m (mlim=18.9). There is no minor planet in MPC and no any known sources in VIZIER at this place. We have reference image on 2017-01-28.75669 UT with unfiltered mlim=19.9m.
Deep images and possibly host galaxy spectral observations are required. | 2021-10-25 04:59:00 | optical,gamma ray,gamma-ray burst,planet,transient,variables,request for observations | 2021-10-25 | 04:59:00 | 1,000 | [
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] | 14,994 |
14,997 | UVOT detection of UV outburst from an unidentified source | David Modiano (Anton Pannekoek Institute), Rudy Wijnands (Anton Pannekoek Institute) | Recently we initiated the Transient UV Objects (TUVO) project, in which we search for serendipitous UV transients in near-real time in Swift/UVOT data using a purposely-built pipeline. Using this method, we recently detected a significant (>4 magnitudes), UV-bright outburst from an unidentified source, lasting at least one week.
On October 13 our pipeline detected the transient at RA=05:09:34.36 and Dec=+05:34:13.3. The source was at AB magnitudes 19.2 +/- 0.4, 18.6 +/- 0.2, 19.7 +/- 0.3, 19.9 +/- 0.3, and 19.4 +/- 0.2 in the B, U, UVW1, UVM2 and UVW2 bands, respectively, and was not detected with the V filter (3-sigma upper limit >19.3). This indicates a relatively flat outburst spectrum in the blue-UV range peaking in the U band.
We stacked all archival UVOT images in the V (total exposure time 9ks), B (10ks), U (23ks), UVW1 (43ks), UVM2 (66ks), and UVW2 (62ks) filters, and from the stacked images determined deeper upper limits at the source position of 20.3, 21.2, 22.4, 23.0, 23.6, 23.8 magnitudes, respectively. This allowed us to estimate an outburst amplitude of at least around 4 magnitudes in the U-UV (though it could be significantly greater, depending on the still unknown brightness of the source in quiescence).
In subsequent UVOT observations on October 20, the source was again not detected in V (upper limit >19.3), but it had slightly brightened in B (18.6 +/- 0.3) and it had decayed in U, UVW1, and UVW2 to 19.5 +/- 0.3, 20.1 +/- 0.3, and 20.6 +/- 0.3, respectively (no data were obtained in the UVM2 filter).
A ZTF alert for a source at this position was also found (October 10), with detections in g and r bands at magnitudes of around 19.2 and 19.3, respectively, and again in the g band on October 17 at 19.8 mag. A previous detection with ZTF was made in 2019 (ZTF19abqykum) at similar brightness, indicating that this source undergoes recurrent outbursts.
The amplitude, timescale, colour, and recurrence of the outburst may suggest that the source is an accreting white dwarf system that exhibited a dwarf nova outburst.
We are monitoring the source with UVOT in the coming week. | 2021-10-25 20:48:00 | optical,ultra-violet,cataclysmic variable,nova,transient,variables | 2021-10-25 | 20:48:00 | 2,126 | [
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] | 14,995 |
14,998 | Discovery of an Apparent Nova in M81 | K. Hornoch, H. Kucakova (Ondrejov), S. C. Williams (Turku), G. Sala, J. Jose (UPC-IEEC), B. Stecklum (TLS), M. J. Darnley (LJMU), A. Kaur (PSU), D. H. Hartmann (Clemson), A. W. Shafter (SDSU) | The M81 nova monitoring collaboration reports the discovery of an apparent nova in M81 on a co-added 1980-s unfiltered CCD frame taken on 2021 Oct. 22.907 UT with the 0.65-m telescope at Ondrejov.
The object designated PNV J09553630+6903289 is located at R.A. = 9h55m36s.30, Decl. = +69o03'28".9 (equinox 2000.0), which is 16.8" east and 26.2" south of the center of M81 (see link to discovery image below).
As with all extragalactic novae, follow-up spectroscopic and photometric observations to determine the nova's spectroscopic class and rate of decline (speed class) are encouraged. | 2021-10-26 04:05:00 | optical,nova,transient | 2021-10-26 | 04:05:00 | 589 | [
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] | 14,996 |
14,999 | REM follow-up observations of the flaring flat spectrum radio quasar TXS 0646-176 | Filippo D'Ammando (INAF-IRA Bologna) | Following the flaring activity from the flat spectrum radio quasar TXS 0646-176 (z = 1.232) observed by Fermi-LAT, AGILE-GRID, and DAMPE in gamma-rays (ATel #14980, ATel #14981, ATel #14993) and by Swift-XRT and SRG/eROSITA in X-rays (ATel #14987, ATel #14991), we have activated follow-up observations with the robotic 60-cm REM telescope located at La Silla (Chile) with a DDT request (PI: D'Ammando).
DDT observations were carried out with REM on 2021 October 23 and 24 with 180 s integration images in r and i bands. Recent observations of the source with REM were carried out on 2021 October 1, at the beginning of the gamma-ray activity period, for a Guest Observer program (ID: 43004, PI: D'Ammando). Optical calibration was performed against the APASS catalog. Preliminary results are reported in the following table.
Band 2021-10-01 2021-10-23 2021-10-24 r 18.08 +/- 0.08 18.08 +/- 0.12 17.17 +/- 0.05 i 17.56 +/- 0.08 17.52 +/- 0.12 17.37 +/- 0.10
REM observed a significant enhancement of the activity of TXS 0646-176 in r-band in October 2021, with an optical flare occurred on October 24. As a comparison, the SDSS r-band magnitudes of the source are 18.82 and 18.58 in DR8 (Aihara et al. 2011, ApJS, 193, 29) and 18.84 in DR7 (Abazajian et al. 2009, ApJS, 182, 543). The r-band magnitude observed by REM on 2021 October 24 is brighter than the value observed in 2018 December 9 by NOT (ATel #12293), at the time of the 2018 gamma-ray flaring activity (ATel #12327). The SDSS i-band magnitude of the source is 18.22, confirming the enhancement of the activity of TXS 0646-176 in 2021 October also in i-band.
In consideration of the ongoing activity of this source, we encourage multi-wavelength observations. REM will continue to monitor TXS 0646-176 in the next days.
We would like to thank the REM Team and Director for making these observations possible. | 2021-10-26 17:48:00 | radio,optical,x-ray,gamma ray,agn,black hole,blazar,quasar | 2021-10-26 | 17:48:00 | 1,875 | [
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15,000 | NICER follow-up observations of the flaring blazar TXS 0646-176 | Filippo D'Ammando (INAF-IRA Bologna) and Giulia Migliori (INAF-IRA Bologna) | Following the recent gamma-ray flaring activity of the flat spectrum radio quasar TXS 0646-176 (ATel #14980, ATel #14981, ATel #14993), the source has been observed by NICER for a ToO request (NICER GO Cycle 3 ID: 4115, PI: D'Ammando) between 2021 October 19 21:08 UTC and October 25 05:53 UTC for an effective time of 61.5 ks.
The source is detected above the background across the energy interval 0.5-6.0 keV in the quick look data, with an average count rate of 2.0 counts/s. Variations of the count rate up to a factor of 2.5 has been observed across the observation, with possible short flares.
Preliminary analysis shows that the NICER spectrum collected over the entire period in the 0.5-6.0 keV energy range can be described by an absorbed power-law model with a HI column density consistent with the Galactic value in the direction of the source (n_H = 2.37 x 10^21 cm^-2, Ben Bekhti et al., 2016, A&A, 594, A116) and a photon index of 1.22 +/- 0.01. The corresponding (observed) 0.3-10 keV flux is (7.9 +/- 0.1)e-12 erg cm^-2 s^-1. The photon index is similar to the ones reported for the X-ray observations carried out by Swift-XRT (ATel #14987) and SRG/eROSITA (ATel #14991) on 2021 October 18 and 2021 October 14-15, respectively. The X-ray flux estimated by NICER over the period 2021 October 19-25 is slightly lower than the values recently observed by Swift-XRT and SRG/eROSITA.
In consideration of the ongoing activity of this source, confirmed also by optical observations performed by REM (ATel #14999), we encourage further multi-wavelength observations.
We thank the NICER PI, Keith Gendreau, and the operation team for the rapid approval and execution of the ToO request. NICER is a 0.2-12 keV X-ray telescope operating on the International Space Station. The NICER mission and portions of the NICER science team activities are funded by NASA. | 2021-10-26 23:48:00 | radio,optical,x-ray,gamma ray,agn,black hole,blazar,quasar | 2021-10-26 | 23:48:00 | 1,869 | [
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] | 14,998 |
15,001 | SOAR spectroscopic classification of Gaia21esm and Gaia21eqn as highly reddened classical novae | A. Kawash, E. Aydi (MSU), P. Velez (OB Observatory, SSO), L. Chomiuk, J. Strader, K. V. Sokolovsky (MSU) | We report on spectroscopic follow up of Gaia21esm and Gaia21eqn. Both transients were reported as hostless red transients in the Galactic plane by Gaia Photometric Science Alerts (GSA) making them classical nova candidates. Gaia appears to be the only transient reporting survey to have detected them. We obtained low resolution spectra with the Goodman spectrograph (Clemens et al. 2004, SPIE, 5492, 331) on the 4.1m SOAR telescope on 2021-10-26.0, and both spectra are consistent with that of classical nova eruptions. These are the 16th and 17th Galactic novae to be spectroscopically confirmed in 2021, the highest number confirmed in a single year on record. We discuss each individual nova below.
Gaia21esm was first detected by Gaia on 2021-09-20 at G = 13.8 mag and then again on 2021-10-16 at G = 16.3 mag. Because GSA requires transients to be detected in both fields of view (Hodgkin et al. 2021 A&A, 652, A76), it was not reported as a new transient until after the second detection. The low resolution Gaia BP/RP spectrum shows a red continuum with apparent emission lines. The SOAR spectrum shows a red continuum with strong emission lines of H I and O I. Halpha is characterized by a FWHM of around 2000 km/s. The overall spectrum is that of a highly reddened classical nova, after optical peak.
Gaia21eqn has only been detected on 2021-10-06 at G = 13.9 in both fields of view. The low resolution Gaia spectrum also shows a red continuum with possible emission lines. The field is nearing Solar conjunction, making follow up observations of this transient difficult. We obtained 600s R- and I-band images of the field with a Sky90 refractor on 2021-10-22. The low altitude of 21 deg. made reliable photometry difficult to measure, but we estimate a brightness of R = 19.7 +/- 1.9 mag and I = 14.7 +/- 0.1 mag, consistent with a highly reddened transient that has likely faded since the last Gaia observation. The SOAR spectrum also shows a red continuum with strong emission lines of H I and O I and a Halpha FWHM of around 2300 km/s. The overall spectrum is also that of a highly reddened classical nova, after the optical peak.
We would like to thank SOAR observing assistant Carlos Corco for help with these difficult low altitude observations. This ATel is based on observations obtained at the Southern Astrophysical Research (SOAR) telescope, which is a joint project of the Ministerio da Ciencia, Tecnologia, Inovacoes e Comunicacoes do Brasil (MCTIC/LNA), the U.S. National Science Foundation's National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU). We also acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts). | 2021-10-27 00:13:00 | optical,nova,transient | 2021-10-27 | 00:13:00 | 2,773 | [
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