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Discovery of radio emission from X-ray pulsar PSR J1852+0040
V. M. Malofeev (PRAO LPI, Pushchino), O. I. Malov (PRAO LPI, Pushchino), D. A. Teplykh (PRAO LPI, Pushchino), A. P. Glushak (PRAO LPI, Pushchino)
We report the detection of radio pulses from X-ray pulsar J1852+0040 with the same period (105 ms) at frequency 111.23 MHz. This pulsar was discovered in March 2005 by Gotthelf et al. (astro-ph/0503424) in the compact central object (CCO) of the young supernova remnant Kes 79 using XMM-Newton observations. Our observations were made during 24 days in April-May 2005 using the Large Phased Array in Pushchino Radio Astronomy Observatory (PRAO, Russia), sensitive transit radio telescope consisting of 16384 dipoles and on operating frequency of 110.5 +/- 1.5 MHz. We used multi-channel receiver with 48 or 32 channels, where the individual channel had a width equal to 20 or 5 kHz. Pulsar signal (S/N>6) was detected in the half of days with the integration of 1647 pulses for each day. The width of the integration profile at 50 percent of the intensity maximum is <25 ms, that is about two times less than in X-ray one. We can not give more precise value of the pulse width, if we take into account the possible broadening of the pulsar shape in the interstellar medium at 111 MHz. The estimate for the dispersion measure 110 +/- 3 pc/cm^{3} places the pulsar at the distance 1.3-3.5 kpc, according to the measurements of the distances of five surrounding pulsars (Taylor at al. 1995, unpublished data). Our distance is less than the estimation as 7.1 kpc derived from HI and OH absorption studies for Kes 79 (Gotthelf at al., 2005). We derive the period of 0.1049122(1) s and the period derivative of 1.1(5)x10^{-13} s/s on JD 2453296.0 using reliable measurements (for 6 days of observations) between JD 2453462 and JD 2453503. It is the second case of the pulsar discovery in the CCO. The 424 ms X-ray pulsar J1210-5226 in the supernova remnant PKS 1209-51/52 was detected by Zavlin et al. (ApJ 540, L25) in 2000. The radio emission detection is very important, because there is no model for properties of such pulsars and the implications for the origin of CCOs in general. The presence of radio can demonstrate that PSR J1852+0040 is a rotating-powered pulsar (Gotthelf et al. 2005).
2005-05-27 15:23:00
radio,x-ray,neutron star,pulsar,star,supernova remnant,supernovae,transient
2005-05-27
15:23:00
2,093
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500
502
Type Determination for SN 2005cc
The Nearby Supernova Factory: P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
The Nearby Supernova Factory reports on three spectra (range 340-1000 nm) of SN 2005cc in NGC 5383 (CBET #154) obtained May 21.4 UT, May 24.4 UT and May 26.4 UT with the SuperNova Integral Field Spectrograph on the University of Hawaii 2.2-m telescope. The first spectrum shows a red continuum with very weak narrow absorption features unlike any other known supernova spectrum. The spectrum obtained May 24.4 UT shows overall increased flux and deeper narrow absorption features similarly to that of SN 2002cx at -4 ( Li et al. 2003, PASP, 115, 453, and Branch et al. 2004, PASP, 116, 903) . The third spectrum obtained May 26.4 UT confirmed the similarity to SN2002cx prior to maximum light, making possible to approximately date the first observation at around one week before maximum. On the May 26.4 UT spectrum absorption features of FeIII 440.4 nm and FeIII 512.9 nm are visible, CaII H&K and SiII 635.5 nm appear weaker than in SN2002cx at -4. Assuming the NED recession velocity for the host galaxy of 2270 km/s, SiII 635.5 nm appears at 5900 km/s, and a weak H-alpha absorption feature may be present with a velocity of 4000 km/s. Na I D lines at the velocity of the host suggests that there might be some extinction along the line of sight.
2005-05-28 02:05:00
optical,nova,supernovae
2005-05-28
02:05:00
1,251
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-0.017374297603964806, -0.07230272889137268, -0.031437501311302185, 0.03846694901585579, -0.03117033839225769, 0.01674455776810646, -0.009022114798426628, -0.01395984087139368, -0.0023501410614699125, 0.0665086954832077, -0.041274044662714005, -0.024848151952028275, -0.032895710319280624, -0.06488429009914398, -0.054723139852285385, -0.05758649855852127, -0.08438709378242493, 0.003893550019711256, -0.017612546682357788, -0.044429145753383636, 0.1058574914932251, -0.09321579337120056, -0.05442595109343529, 0.004701089579612017 ]
501
503
Large-scale Jets in GRS 1915+105
M. P. Rupen (NRAO/GSFC), V. Dhawan, A. J. Mioduszewski (NRAO)
Observations with the Very Large Array (VLA), originally intended to support the HERO balloon flight, show multiple arcsecond-scale components moving out from the core of the black hole X-ray binary GRS 1915+105. Data taken at 8.46 GHz on May 11 and May 23 show extended emission along the known jet axis of this microquasar (e.g., Mirabel & Rodriguez 1994 [MR94], Nature, 371, 46-48). The beam was roughly round in both observations, with a full-width at half-maximum of about 0.67 arcseconds. Although poor weather on May 11 precludes an accurate position determination, fitting two Gaussians to the image yields a reasonable fit with a separation of 0.54 arcseconds along a position angle (PA) 149 degrees east of north, where the formal error is less than 10 milliarcseconds (mas). A similar fit to the May 23 data gives a separation of 0.87 arcseconds at PA=148 degrees, implying an increase of 27 mas/day. This is comparable to the range of proper motions previously observed in this source (e.g., MR94; Fender et al. 1999 [F99], MNRAS 304, 865-876), and implies a rough ejection date of April 21 (MJD 53481). The total flux densities at 8.46 GHz were 51.4 and 37.9 mJy on May 11 and 23, respectively, with the corresponding south:north flux density ratios being 5.8:1 and 4.2:1. Higher-resolution images made at 15 and 22 GHz on May 23 (beam sizes 0.39 and 0.25 arcseconds, respectively) reveal a more complex picture. Good fits require three components: an extended Gaussian plus a point source to the southeast, and a point source to the northwest. There is no detectable emission from the core after subtracting these components; the rms noise levels are 0.24 and 0.16 mJy/beam at 15 and 22 GHz, respectively. The 22 GHz fits give the following: Contour plots, total flux densities, and other information may be found at Observations at other wavelengths, particularly infrared and (if possible) X-ray imaging, are strongly encouraged. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
2005-05-28 02:29:00
radio,millimeter,sub-millimeter,infra-red,optical,x-ray,binary,black hole,transient,variables
2005-05-28
02:29:00
2,109
[ -0.01296861469745636, 0.017282560467720032, -0.02668365277349949, 0.05717914178967476, 0.02148684673011303, -0.07357795536518097, -0.030921680852770805, 0.05963784083724022, -0.057074543088674545, -0.0692405253648758, -0.015205685049295425, 0.018986521288752556, -0.02283467911183834, -0.014538612216711044, -0.07756936550140381, -0.018328536301851273, 0.07847493886947632, -0.08455061912536621, -0.0032845581881701946, 0.05429278314113617, 0.01798761449754238, 0.017888952046632767, -0.014410636387765408, 0.019721660763025284, 0.038082800805568695, 0.04161887615919113, -0.01697305217385292, -0.06882552802562714, -0.057399749755859375, -0.039804309606552124, 0.0014928275486454368, 0.046184245496988297, -0.02926880307495594, -0.02111944556236267, 0.052523110061883926, 0.019142339006066322, 0.027664879336953163, 0.019643323495984077, 0.015956202521920204, 0.037630170583724976, -0.05482702702283859, -0.01732921041548252, 0.052126191556453705, 0.041313085705041885, -0.004919514525681734, 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502
504
1A 0535+262 in Outburst
Jack Tueller, Marco Ajello, Scott Barthelmy, Hans Krimm, Craig Makwardt, Gerald Skinner
The BAT instrument on Swift has detected the transient source 1A 0535+262 at the count rate > 3 times the Crab Nebula. The outburst was first detectable on May 16 in one day averages of BAT survey products in the energy band 15-195 keV. The source is currently near the Sun (~17 degrees).
2005-06-01 00:13:00
x-ray,gamma ray,binary,neutron star,pulsar,star,the sun,transient
2005-06-01
00:13:00
288
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503
505
SAX J1808.4-3658 is in Outburst Again
C. B. Markwardt (U. Maryland & NASA/GSFC), J. Swank (NASA/GSFC), R. Wijnands (U. Amsterdam), J. in 't Zand (SRON)
RXTE PCA Bulge scans on May 31, 23h UTC, indicate that a source consistent with the position of SAX J1808.4-3658 has entered outburst. The previous outburst of J1808 was in October 2002, and this outburst would be consistent with the approximate recurrence period of ~2 years. The 2-10 X-ray flux was approximately 3 mCrab. A small amount of high time resolution data was available (~150 seconds). The expected 401 Hz pulsations were not detected in a straight un-barycentered FFT, with a 95% confidence upper limit of ~25% r.m.s. This does not rule out the identification of SAX J1808.4-3658, since the pulsation amplitude is typically ~5%. More RXTE observations are planned.
2005-06-02 01:27:00
x-ray,binary,neutron star,pulsar,star,transient,request for observations
2005-06-02
01:27:00
679
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504
506
Radio upper limit for SAX J1808.4-3658
M. P. Rupen (NRAO/GSFC), V. Dhawan, A. J. Mioduszewski (NRAO)
Very Large Array (VLA) observations of the accreting millisecond pulsar SAX J1808.4-3658, taken at 8.46 GHz on June 2nd, give a non-detection with a nominal flux density at the location of the source of 0.15 +/- 0.09 mJy/beam. Further observations are planned, based on the possible X-ray outburst (ATEL #505). The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
2005-06-02 21:45:00
radio,x-ray,binary,neutron star,pulsar,star,transient
2005-06-02
21:45:00
471
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505
507
Pointed RXTE observations of SAX J1808.4-3658
R. Wijnands, M. Klein Wolt, M. Linares, M. van der Klis (U. of Amsterdam), D. Chakrabarty, E. H. Morgan (MIT), C. B. Markwardt (U. Maryland & NASA/GSFC)
Follow-up RXTE PCA observations of the transient source consistent with the position of SAX J1808.4-3658 (ATEL#505) showed clear coherent pulsations at approximately 401 Hz. This frequency is identical to the spin frequency of the neutron star in SAX J1808.4-3658 demonstrating that it is indeed SAX J1808.4-3658 which is in outburst again. During the three pointed observations the 2-10 keV X-ray fluxes were approximately 19 mCrab on June 1, 17:35 - 18:42 UTC, 31 mCrab on June 2 00:13 - 00:51 UTC, and 34 mCrab on June 2 10:56 - 11:46 UTC indicating that the X-ray flux is still rising. One type-I X-ray burst was detected during the second observation. Millisecond oscillations at the spin frequency were detected during the burst. During all observations, the aperiodic variability was dominated by strong broad band-limited noise (roughly 25% r.m.s. amplitude in the frequency range 0.1-100 Hz) similar to what has been observed during previous outbursts of SAX J1808.4-3658. During the individual observations no significant features above 100 Hz were detected. However, when combining the data of all three observations and fitting the power density spectrum with a combination of Lorentzians, a broad peaked noise component can be detected (3.7 sigma) at a frequency of around 300 Hz. This high frequency feature might be related to the kilohertz quasi-periodic oscillations (kHz QPOs) previously seen for this source during its October 2002 outburst. If correct, then this broad noise feature should evolve into a true kHz QPO if the X-ray flux continues to rise, similar to what was seen during the October 2002 outburst of SAX J1808.4-3658. Additional RXTE observations are planned.
2005-06-03 01:25:00
x-ray,binary,neutron star,pulsar,star,transient
2005-06-03
01:25:00
1,697
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506
508
Discovery of CV ROTSE3 J212313-021446.6
E. S. Rykoff (UMich) on behalf of the ROTSE collaboration
Rapid analysis of ROTSE-III sky patrol fields reveals a probable new CV which we designate ROTSE3 J212313-021446.6. The object was first detected Jun. 01.05, 2005 by the ROTSE-IIIc telescope at the H.E.S.S. site in Namibia, at an unfiltered magnitude of 16.8. It was detected 1 day later at an unfiltered magnitude of 16.9, which is our most recent observation of the transient. Observations from May 23 do not detect the source to a limiting magnitude of 17.5. Visual inspection of the POSS-II plate scans from USNO reveals a faint counterpart. The light curve during outburst and quiescent magnitude of this transient are very similar to other galactic CVs detected by ROTSE-III. We tentatively conclude that this is a galactic CV, although we require spectroscopic or multi-band confirmation. Further information including a light curve and image can be found at http://www.rotse.net/transients/j2123/index.html
2005-06-03 05:19:00
optical,cataclysmic variable,transient,variables
2005-06-03
05:19:00
914
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507
509
Type refinement for SN 2005by
Avishay Gal-Yam, David Sand and Douglas Leonard (Caltech)
Avishay Gal-Yam, David Sand and Douglas Leonard report for the CCCP: We have observed SN 2005by (Park & Li, IAUC # 8523 ) with the DBSP spectrograph mounted on the 200" Hale Telescope at Palomar Observatory on June 4, 2005 UT. We find that this object, initially reported to be a type II SN (Modjaz et al., IAUC # 8523 ; Gal-Yam & Djorgovski, ATEL #480) can now be determined to be a type IIb SN, having developed prominent Helium lines, including those at 6678 and 7065 Angstrom.
2005-06-05 08:07:00
optical,supernovae
2005-06-05
08:07:00
480
[ -0.12062374502420425, -0.09905888140201569, -0.011601103469729424, 0.04393285512924194, 0.01623610407114029, 0.03971296548843384, -0.005206432193517685, 0.029248084872961044, -0.07273758202791214, -0.036243975162506104, -0.04348236694931984, 0.00850397814065218, -0.07572479546070099, -0.055999644100666046, -0.05190519616007805, -0.012033683247864246, 0.04794423654675484, -0.13636276125907898, 0.07582361251115799, 0.05845233425498009, -0.015985563397407532, 0.013526705093681812, -0.034299928694963455, 0.07710333913564682, 0.06369414180517197, -0.029314398765563965, -0.012364566326141357, 0.026981275528669357, 0.03671834245324135, -0.05540706217288971, 0.037623487412929535, 0.10395830869674683, -0.031169652938842773, 0.03271404281258583, 0.02212350443005562, -0.014493297785520554, 0.0559445321559906, -0.00893150269985199, 0.003475770354270935, -0.04109629616141319, 0.04369327053427696, -0.11230313777923584, 0.0581866092979908, -0.01922580599784851, 0.05825696885585785, 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508
510
Radio emission from X-ray pulsar PSR J1852+0040
Alexander A. Ershov (PRAO ACS LPI, Pushchino)
Malofeev et. al. (ATEL #501) reported the detection of radio pulses from X-ray pulsar J1852+0040 at the frequency of 111.23 MHz. I also made observations of this object using the same telescope. Observations were performed from April to May 2005 with the Large Phase Array (BSA) Radio Telescope at Pushchino Radio Astronomy Observatory of Lebedev Physical Institute at a frequency of 111 MHz. BSA is a transit telescope with an effective area of about 15,000 square meters. One linear polarization was received. I used a 128-channel receiver with channel bandwidth 20 kHz. The sampling interval was 2.56 ms and the receiver time constant was tau = 3 ms. The duration of each observation session was about 3 min (1600 pulsar periods). A total of 27 observations were carried out in the mode of recording single pulses. Folding of all 27 observation sessions using parameters of Malofeev et. al. (ATEL #501) gives negative result for each observation session - there are no pulses with S/N > 5 at the dispesion measure of 110 pc/cm(3). Unfortunately, I can't confirm the detection of radio emission from X-ray pulsar PSR J1852+0040.
2005-06-06 10:16:00
radio,x-ray,neutron star,pulsar,star,supernova remnant,supernovae,transient
2005-06-06
10:16:00
1,132
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509
511
Optical observations of SAX J1808.4-3658
J. Greenhill (U of Tasmania), C. Coutures, R. Corrales (IAP, Paris)
We report BVRI photometry of the accreting millisecond pulsar SAX J1808.4-3658 with the Mt Canopus 1m telescope on 3 nights June 2, 3 &5 (JD 3524.1, 3525.2, 3527.2). The intensity in I increased by ~0.25 mags between June 3 and 5 whereas the other colours changed very little with V~17.2. The increase in I is suggestive of an "outside-in" transition in the disc or perhaps of synchrotron processes. We note that a similar transient increase in I was reported for this object in April 1998 (Wang et al, ApJ 563, L61-64). Further photometry is planned.
2005-06-06 20:21:00
radio,infra-red,optical,x-ray,binary,neutron star,pulsar,star,transient
2005-06-06
20:21:00
551
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510
512
New outbursts of two faint X-ray transients (GRS 1741.9-2853 and XMM J174457-2850.3) located in the Galactic center region
R. Wijnands, T. Maccarone, J. Miller-Jones, M. van der Klis (U. Amsterdam), M. Rupen, (NRAO/GSFC), J. in 't Zand (SRON-Utrecht), Q. D. Wang (U. Massachusetts), J. Grindlay, D. Steeghs (CfA), R. Fender, R. Cornelisse (U. Southampton), E. Kuulkers (ISOC, ESA/ESAC), C. B. Markwardt (U. Maryland, NASA/GSFC), J. Homan (MIT)
The Galactic Center region was observed in a series of 7 pointings with the Chandra X-ray Observatory on 5 June 2005 01:44-13:08 UTC. During these observations we found that the two faint X-ray transients GRS 1741.9-2853 (e.g., Muno et al. 2003, ApJ 598, 474, and references therein) and XMM J174457-2850.3 (Sakano et al. 2005, MNRAS 357, 1211) were in outburst again. GRS 1741.9-2853 is a neutron star X-ray transient and was detected during our observations at a 2-10 keV flux of approximately 1E-10 erg/s/cm^2 (assuming absorbed power-law spectral shape with a Galactic column density of 9.7E22 cm^-2 and a power-law index of 1.88; see Muno et al. 2003). XMM J174457-2850.3 is a faint X-ray transient that has not been classified yet and that was found at a 2-10 keV flux of approximately 9E-11 erg/s/cm^2 (assuming an absorbed power-law spectral shape with a Galactic column density of 5.9E22 cm^-2 and a power-law index of 1.0; see Sakano et al. 2005). These low flux levels demonstrate that both transients are very faint with 2-10 keV X-ray luminosities of 7-8 E35 erg/s (assuming a distance of 8 kpc). We urge follow-up observations at X-ray, infrared, and radio wavelengths of these enigmatic X-ray transients. Our Chandra observations are part of a X-ray monitoring campaign (PI: Wijnands) of the Galactic center region (approximately 1.7 square degrees centered on Sgr A*) using both the Chandra X-ray Observatory and the XMM-Newton telescope. The purpose of these observations is to search for outbursts of faint X-ray transients (with 2-10 keV X-ray luminosities between 1E34 and 1E36 erg/s) which cannot be detected by other monitoring X-ray satellites due to sensitivity limits and/or confusion problems. The next set of observations will be performed around 9-10 September 2005 (XMM-Newton), in the week of 17 October 2005 (Chandra), and around 28 February 2006 (XMM-Newton).
2005-06-07 03:56:00
radio,infra-red,x-ray,binary,black hole,neutron star,star,transient,request for observations
2005-06-07
03:56:00
1,896
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511
513
Radio upper limits for SAX J1808.4-3658
S. Migliari (Amsterdam), R. Sault (ATNF), E. Gallo (Amsterdam), R. Fender (Southamton), R. Wijnands, M. van der Klis (Amsterdam)
The accreting millisecond X-ray pulsar SAX J1808.4-3658 has been observed in the radio band with the Australia Telescope Compact Array (ATCA) on 2005 June 4th (20:37 - 21:49 UT), during the rise of its current X-ray outburst (ATEL #505, #507). The X-ray and optical flux (ATEL #511) were still rising during the observations. The radio-counterpart was not detected with a flux density rms=0.22 mJy at 4.8 GHz and rms=0.30 mJy at 8.6 GHz. These upper limits are consistent with the Very Large Array (VLA) non-detections at 8.6 GHz on June 2nd (ATEL #506). The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility menaged by CSIRO.
2005-06-07 18:23:00
radio,optical,x-ray,binary,neutron star,pulsar,star,transient
2005-06-07
18:23:00
676
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512
514
V1118 Ori
A. Di Paola & D. Lorenzetti (Osservatorio Astronomico di Roma - INAF, Italy), A. Arkharov (Central Astronomical Observatory of St. Petersburg, Russia), V. Larionov (Astronomical Institute of St. Petersburg University, Russia)
We have observed the EXOr V1118 Ori in the near IR at Campo Imperatore (Italy) telescope, obtaining the following magnitudes: MJD 53449.2501, magJ = 11.16; MJD 53463.2504, magJ = 10.79; MJD 53475.2691, magJ = 10.94; MJD 53449.2517, magK = 9.79; MJD 53463.2489, magK = 9.48; MJD 53475.2708, magK = 9.53. The values are calibrated using 2MASS catalog and errors are of the order of 0.01mag in both bands. In the near IR, the object does not appear in its declining phase after the unusual outburst recently observed in the V band (Williams & Heathcote IAUC # 8460 ). The observed colour [J-K] of about 1.35 mag is very similar to that of the FUOri objects (Molinari, Liseau & Lorenzetti, 1993). Other IR observations are encouraged and we will continue such monitoring program.
2005-06-08 16:16:00
infra-red,variables
2005-06-08
16:16:00
775
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513
515
Optical and IR observations of SAX J1808.4-3658 in outburst
N. Rea (SRON/OAR), V. Testa, G. L. Israel, A. Antonelli (OAR), P. G. Jonker (SRON/CfA), M. Mendez (SRON), S. Campana (OAB) and E. Molinari, G. Chincarini, F. M. Zerbi, M. Rodono', S. Covino, G. Tosti, P. Conconi, G. Cutispoto, L. Nicastro, E. Palazzi, F. Vitali, F. D'Alessio, E. Meurs, P. Goldoni on behalf of the REMIR/ROSS team
We report on optical and infrared observations of the currently active transient millisecond pulsar SAXJ1808.4-3658 (see ATEL #505, #506, #507, #511, #513), performed with REM (Rapid Eye Mount), a 60-cm robotic telescope located at the La Silla Observatory (Chile). Optical images were obtained using ROSS, the REM Optical Slitless Spectrograph (field of view of 10'x10' and a pixel size of 0.575"), on 2005 June 5, 6, 7, and 8, using a V, R, and I band filter. Our photometric results are relative to those of Giles, Hill & Greenhill 1999 (MNRAS 304, 47). SAX J1808.4-3658 optical counterpart was detected during all the observations. Its V, R, and I band magnitude is consistent with being constant during the observations within 2 sigma (See Table; errors are at 1 sigma confidence level). Our magnitudes are consistent with the 1998 outburst magnitudes reported by Giles et al. 1999. Date-Obs   UT   t_exp     Vmag               Rmag               Imag         FWHM ======================================================= 05/05/05   01:22   60s   17.16+/-0.21   16.86+/-0.20   17.43+/-0.34       4.0" 06/05/05   01:08   60s   17.61+/-0.27   16.92+/-0.20   17.76+/-0.52       4.5" 07/06/05   01:05   60s   17.47+/-0.16   17.44+/-0.21   17.31+/-0.23       2.3" 08/06/05   00:58   60s   17.39+/-0.19   17.09+/-0.19   17.42+/-0.23       2.5" Infrared observations were performed in the H band using the REMIR, the REM Infrared Camera (field of view of 10'x10' and a pixel size of 1.22"), on 2005 June 5, 6, 7, and 8 . SAX J1808.4-3658 infrared counterpart was not detected in the H band. The 5 sigma magnitude upper limit on its non-detection is H>16.5 for all the observations. Images for the four nights in V, R and I, and more details about the observations, can be found at http://www.mporzio.astro.it/~rea/saxj1808_rem.html For further information on the REM telescope see http://golem.merate.mi.astro.it/projects/rem/ We plan to keep monitoring the source with REM in the next nights.
2005-06-13 16:32:00
infra-red,optical,binary,neutron star,pulsar,star,transient
2005-06-13
16:32:00
2,049
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514
516
Possible new X-ray burst source detected by HETE
Roland Vanderspek (MIT), Ed Morgan (MIT), Geoff Crew (MIT), Carlo Graziani (UChicago), Motoko Suzuki (RIKEN), for the HETE Team
The HETE Fregate, WXM and SXC instruments detected burst H3804 at 11:22 UT on 14 June 2005. The burst is soft (all photons < 30 keV), has a FRED-like profile, and exhibits the general spectral and temporal characteristics of a radius-expansion X-ray burst. H3804 is localized by the WXM and SXC to a circle of radius 80" centered at RA = 19h 00m 6.4s, Dec = -24d 54' 54.7' (J2000). H3804 is situated within 15 degrees of the galactic center: l=11, b=-13. It does not appear to coincide with any entry for an X-ray source in the SIMBAD catalog. Thus, it is very likely to be a new, previously uncatalogued XRB, and not an XRF or a GRB, although we cannot absolutely exclude that possibility. Followup observations are encouraged.
2005-06-15 04:28:00
x-ray,neutron star,star
2005-06-15
04:28:00
728
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0.016688140109181404, -0.04751359671354294, 0.04158811271190643, 0.04132910817861557, -0.05422891303896904, 0.06200885400176048, -0.058177776634693146, -0.060455404222011566, -0.0070154909044504166, -0.025643782690167427, -0.03507715463638306, 0.027193773537874222, -0.011116095818579197, -0.07057684659957886, -0.058944109827280045, 0.010753626935184002, -0.011686790734529495, -0.025928646326065063, 0.003363701980561018, -0.015340087935328484, 0.05317852273583412, -0.06915327161550522, -0.06932492554187775, 0.04989491403102875 ]
515
517
Chandra HETG observations of SAX J1808.4-3658
D. K. Galloway, N. S. Schulz, D. Chakrabarty (MIT)
We report on an observation of the presently active accretion-powered millisecond pulsar SAX J1808.4-3658 (see ATels #505, #506, #507, #511, #513, #515) with the High-Energy Transmission Grating Spectrograph (HETGS) aboard the Chandra X-ray Observatory. The observation lasted for approximately 15 ks starting June 10 0232h (UT), and was made in continuous clocking mode (which provides no imaging capability, but avoids photon pileup for bright sources). Preliminary analysis of the medium-energy grating spectra has revealed an absorption feature at 21.6 angstrom, attributable to the resonance line of (He-like) oxygen VII. We also found evidence for absorption features around the neutral oxygen edge, which we tentatively identify with 1s-2p transitions of O I and O II in the ISM. No other narrow absorption or emission features attributable to the source were identified in the medium- or high-energy grating spectra. We fitted the continuum with an absorbed blackbody and power law spectrum, with a temperature of 0.67 keV and photon spectral index 2.03. The absorbed 2-10 keV flux was 7.6e-10 ergs/cm2/s (about 33 mCrab). No thermonuclear bursts were detected. Analysis continues, and a paper with more detailed results is in preparation.
2005-06-15 06:33:00
x-ray,binary,neutron star,pulsar,star,transient
2005-06-15
06:33:00
1,250
[ -0.1056591346859932, -0.02605200745165348, -0.048478610813617706, 0.062997967004776, 0.02002776600420475, -0.06715350598096848, 0.06444507837295532, -0.03010057657957077, -0.016781087964773178, -0.04088408499956131, -0.03328362852334976, -0.049145471304655075, -0.008009280078113079, -0.07327014952898026, 0.028929319232702255, 0.019455982372164726, 0.06772127002477646, -0.10564932227134705, 0.037347644567489624, 0.04762249067425728, -0.0031725361477583647, -0.011397354304790497, -0.010090899653732777, -0.06658422946929932, 0.07397843897342682, 0.026228124275803566, -0.013508398085832596, -0.0576106458902359, 0.05172708258032799, -0.021581627428531647, 0.03894008323550224, -0.0036050027702003717, -0.06201297044754028, 0.05658887326717377, 0.04427987337112427, 0.040937118232250214, 0.06519365310668945, -0.012608950026333332, -0.016485881060361862, 0.01294840406626463, -0.006063506472855806, -0.04480086266994476, -0.006220963317900896, -0.010654701851308346, -0.07445298880338669, 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516
518
M31 Optical Transient
R. Quimby, P. Hoeflich, J. C. Wheeler, E. L. Robinson (University of Texas), and C. Gerardy (Imperial College)
We report the discovery of a transient in M31 using unfiltered CCD images taken on June 15.38 UT (about 15.8 mag) and June 16.38 (about 16.6 mag) using the 0.45m ROTSE-IIIb telescope at the McDonald Observatory. The object is located at RA = 00h45m05.28s DEC = +41o33'40.1" and was not detected in ROTSE-IIIb data from June 8.41 UT (limiting mag about 17.7). The transient is consistent with a fast nova (cf. Figure 2 of della Valle 1991, A&A, 252, L9). A finding chart for the transient can be found at: http://grad40.as.utexas.edu/~quimby/tss/nova4.png
2005-06-17 02:44:00
optical,nova,transient
2005-06-17
02:44:00
554
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517
519
INTEGRAL discovery of the new source IGR J12349-6434.
M. Chernyakova(ISDC, Geneva), T. J.-L. Courvoisier (ISDC, Geneva), J. Rodriguez (CEA Saclay, ISDC Geneva), A. Lutovinov(IKI, Moscow)
We report the discovery with the IBIS/ISGRI telescope on board INTEGRAL of a previously unknown hard X-ray source IGR J12349-6434. The source was detected while analysing the public data relative to the nearby source 2RXP J130159.6-635806 (Chernyakova et al., submitted to MNRAS). The best fitted position is R.A.=12h34m53.634s, Decl.=-64d34m05.81s (equinox 2000.0, uncertainty 2'). In the 20 - 60 keV mosaic image of 11.01.2003 - 07.07.2003 (167ks), 10.07.03 - 18.07.03 (485 ks), and 24.12.2003 - 22.03.2004 (160 ks) source was detected at a level of 3.2+/-0.4 mCrab (S/N=9.2), 3.7+/-0.2 mCrab (S/N=15.4), and 3.3+/-0.4 mCrab (S/N=8.9) respectively. The average flux in 16 - 20, 20 - 30, 30 - 40, 40 - 60, 60 - 100 keV was equal to 5.3+/-0.1 mCrab, 4.3+/-0.4 mCrab, 3.3+/-0.5 mCrab, 2.7+/-0.5 mCrab, and 1.6+/-0.8 mCrab respectively. We encourage follow-up observations of this source at all wavelengths.
2005-06-17 20:43:00
x-ray,gamma ray,request for observations
2005-06-17
20:43:00
905
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518
520
Possible nova in M31
W. Pietsch(Max Planck Institut f. Extraterr. Physik, MPE), V. Burwitz (MPE, Observatori Astronomic de Mallorca OAM), R. Stoss, S. Sanchez (OAM)
We report the independent discovery and follow-up observations of the possible nova in M31 (see ATEL #518) on unfiltered CCD images (June 15.1038, 15.9 mag; 15.1053, 15.7; 17.0813, 16.9) obtained with the REMO1 telescope of the Observatori Astronomic de Mallorca OAM (620), Costitx, Spain (30cm f/10 Schmidt-Cassegrain telescope with an SBIG STL-1001 1k x 1k CCD camera with 24mu sq. pixels). As position we obtain RA = 00h 45m 05.2s, DEC = +41° 33' 39.8" with an accuracy of 0.3".
2005-06-17 21:45:00
optical,nova
2005-06-17
21:45:00
482
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519
521
X-ray localization and possible IR counterpart of XTE J1747-274/IGR J17473-2721
A. M. Juett (Virginia), D. L. Kaplan (MIT), D. Chakrabarty (MIT), C. B. Markwardt (U. Maryland & NASA/GSFC), P. G. Jonker (SRON/CfA)
On 2005 June 6 23:56UT, we observed a field centered on the source XTE J1747-274 (Markwardt et al., ATEL #498) using the HRC-I on Chandra for 1.1 ks. With a 30' x 30' field of view, we were able to cover an area twice the error circle of the RXTE detection. We found only 1 source in the entire Chandra FOV at a position of RA = 17 47 18.06 Dec. = -27 20 38.9 with an error radius of 0.8". This position is consistent with the source found in a Swift observation of the field (Kennea et al., ATEL #500). The Swift source was identified with the INTEGRAL detected transient IGR J17473-2721 (Grebenev et al., ATEL #467). We find a source count rate of 5.37+/-0.07 cnts/s (1 sigma error). Using the Swift determined spectral parameters and PIMMS, we estimate the source flux at 7.77+/-0.10 x 10^-10 erg/cm^2/s (0.5-10 keV). This is consistent with the Swift determined flux for IGR J17473-2721 and the RXTE measured flux from XTE J1747-274. We therefore conclude that IGR J17473-2721 and XTE J1747-274 are the same source. We also obtained an infrared image of the Swift position on 2005 May 26 04:38UT, using the PANIC camera at the 6.5-m Magellan I (Baade) telescope in Chile. The observation was a total of 270 sec in Ks-band only, under good seeing (0.4"-0.5") and with variable clouds. Astrometric and photometric calibration were done with respect to 2MASS. One infrared source was found in the Chandra error circle with a position of RA = 17:47:18.08 Dec. = -27:20:38.7, 0.3" from the X-ray position. It has Ks=16.2 mag. The FWHM is approximately 4.8 pixels (or 0.6" FWHM), compared to most of the stars in the field that have FWHM = 3.8-4.1 pixels (~0.5" FWHM), so it appears slightly extended and/or blended with another object to the south. We identify this source as the possible infrared counterpart of XTE J1747-274/IGR J17473-2721. Taken together, the properties of the candidate counterpart and X-ray source are not consistent with those of the obscured high mass X-ray binaries that Integral is finding in large numbers.
2005-06-18 01:06:00
infra-red,x-ray,gamma ray,binary,star,transient,variables
2005-06-18
01:06:00
2,039
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520
522
A Glance in the I-band to XMM J174457-2850.3 and GRS 1741.9-2853.
S. Laycock (CfA), P. Zhao (CfA), M. A. P. Torres (CfA), R. Wijnands (Amsterdam), D. Steeghs (CfA), J. Grindlay (CfA), J. Hong (CfA), P. G. Jonker (SRON/CfA).
Following the recent report of renewed activity in the Galactic Bulge X-ray transients GRS 1741.9-2853 and XMM J174457-2850.3 (ATEL #512), we used the IMACS imaging spectrograph mounted at the Magellan-Baade telescope on 2005 June 8th at 01:49 UT to acquire two 5-min I-band images of the field covering both targets. Seeing was 0.5" sampled at 0.2" per pixel with the 8Kx8K CCD mosaic. The field was previously observed in 2003, June 3 with the CTIO 4m + Mosaic imager (I-band 15min, R-band 20min). The Magellan and CTIO images were calibrated using observations of both the field and Stetson standard-field PG1657 made with the CTIO 1.3 m telescope + ANDICAM imager. XMM J174457-2850.3: The IMACS images showed a single optical source within the 4" XMM error circle reported in Sakano et al. (2005,MNRAS,357,1211) and This star was also detected in the CTIO image, located at R.A.(J2000)=17:44:57.29, DEC(J2000)=-28:50:18.4 in the USNO A2 reference frame (0.1" uncertainty). Absolute photometry gives I=21.96 (2003), I=22.04 (2005), with uncertainty 0.1 mag. Differential photometry with respect to 5 nearby stars shows a change < 0.02 mag in its I-band brightness between June 2003 and June 2005. The R-I color is +1.95 (+/-0.2) mag, which translates to Av=7.3. Given that the total Av to the Galactic Bulge is ~25mag, this object has approx 1/3 of the total Av and from the Av vs, distance relation for this l,b (Drimmel et al 2003, A&A,409,205) is therefore located between 2-4 kpc. The column density toward XMM J174457-2850.3 is around 5.9E22 cm^-2, using the Predehl & Schmitt 1995 relation between Nh and Av this gives an Av for the source of ~33. This is ~4.5 times more than the Av measured for the optical star in the XMM error circle. In order to rigorously rule out candidacy as optical counterpart of the X-ray source, the Chandra HRC observations (ATEL #512) were re-investigated to derive an improved position for XMM J174457-2850.3 of R.A(J2000)=17:44:57.44, DEC(J2000)=-28:50:20.3 (error radius 2"). This new X-ray position is 2.74' away from the optical source and combined with the lack of variability and low extinction leads us to conclude that this cannot be the counterpart to the XMM source. Therefore any optical counterpart must be fainter than I=25.6 (the 3-sigma limiting magnitude for the combined IMACS images), as can be expected for a system located in the Galactic Bulge with Av=25. GRS 1741.9-2853: The I-band images show a single optical source (I=21.23 (2003), I=21.21 (2005), error 0.1 mag) within 4" and 4 additional optical sources between 4" and 9". None are consistent with the co-ordinates published for this source by Muno et al. (2003,ApJ,589,225), R.A.(J2000)=17;45:02.33, DEC(J2000)=-28:54:49.7 (error radius 0.7"). Therefore, also in this case the optical counterpart must be fainter than I=25.6. We conclude that no I-band counterparts could be detected for either of these sources. To counter the expected reddening in Bulge fields, we encourage future efforts in the NIR.
2005-06-18 02:23:00
optical,x-ray,binary,black hole,neutron star,star,transient
2005-06-18
02:23:00
3,027
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521
523
HETE J1900.1-2455 is a millisecond pulsar.
Ed Morgan (MIT), Phil Kaaret (UIOWA), and Roland Vanderspek(MIT)
The X-ray Burst source, HETE J1900.1-2455, discovered by HETE (Atel 516) was observed with the RXTE on 2005 June 16 and twice on June 17. All three observations show a source with a flux near 19 mCrab and pulsations at 377.3 Hz. Raster scans with the PCA are consistent with the HETE position. RXTE observations are continuing. Observations to obtain a more accurate X-ray position and to identify an optical counterpart are encouraged.
2005-06-18 04:03:00
optical,x-ray,binary,neutron star,pulsar,star,request for observations
2005-06-18
04:03:00
436
[ -0.14718101918697357, -0.01203896664083004, -0.0067859734408557415, -0.008016601204872131, 0.015947934240102768, -0.029575124382972717, 0.034083276987075806, 0.07006688416004181, -0.037433743476867676, -0.02854067273437977, 0.03412212058901787, 0.03052261285483837, 0.016299866139888763, 0.000020283128833398223, -0.015517122112214565, -0.04338042438030243, -0.0190484169870615, -0.06765735149383545, 0.032567426562309265, -0.028661390766501427, -0.0092933913692832, 0.03511960431933403, -0.0362260527908802, -0.04676888510584831, -0.005218039732426405, 0.006930053234100342, 0.0424964502453804, -0.1042766347527504, 0.00836869329214096, -0.05384857952594757, 0.08853916078805923, 0.040003422647714615, -0.07296106219291687, 0.03433902561664581, 0.02461189776659012, -0.01769009418785572, 0.00012124773638788611, -0.010624020360410213, 0.012020271271467209, -0.019754724577069283, -0.00662475498393178, -0.04752417653799057, 0.025501957163214684, -0.019773542881011963, -0.053722184151411057, 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522
524
Radio detections of SAX J1808.4-3658
M. P. Rupen (NRAO/GSFC), V. Dhawan, A. J. Mioduszewski (NRAO)
Very Large Array (VLA) observations of the accreting millisecond pulsar SAX J1808.4-3658 (see ATels #505, #506, #507, #511, #513, #515, #517) have given results as follows (the 4 June measurement is taken from the ATCA, as given in ATel #513, and is included here for comparison): The radio spectrum is only poorly constrained by these data, being alpha= 2.0 +/- 1.0 (flux density going as nu^alpha) on June 16. Radio detections from previous outbursts (e.g., Gaensler, Stappers, & Getts 1999, ApJ 522, L117) suggest this is synchrotron emission, but we cannot yet confirm that in this case. Further radio observations, covering a wider range of frequencies, are planned. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
2005-06-18 04:16:00
radio,optical,x-ray,binary,neutron star,pulsar,star,transient
2005-06-18
04:16:00
833
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523
525
RXTE PCA Position of HETE J1900.1-2455
C. B. Markwardt (U. Maryland & NASA/GSFC), P. Kaaret (U. Iowa), R. Vanderspek and E. Morgan (MIT)
RXTE PCA scans of the new millisecond pulsar HETE J1900.1-2455 (Morgan et al., ATEL #523) were performed on Jun 17 starting at 09:48 UT. The best fit position is R.A. = 19h 00m 13s, Decl. = -24d 54m 44s (J2000), with a systematic uncertainty radius of approximately 1 arcminute. This position is indeed consistent with the HETE burster (Vanderspek et al. ATEL #516), as noted by Morgan et al. (ATEL #523). The flux was approximately 23 mCrab.
2005-06-19 03:43:00
x-ray,binary,neutron star,pulsar,star
2005-06-19
03:43:00
442
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524
526
HETE J1900.1-2455 Optical Counterpart
Derek B. Fox (Caltech)
I have observed the localization of the HETE transient HETE J1900.5-2455 (Vanderspek et al., ATEL #516), which has been identified as a 2.65-ms X-ray pulsar (Morgan, Kaaret & Vanderspek, ATEL #523), with the Robotic Palomar 60-inch Telescope, in five 120-s R-band and five 120-s i-band exposures extending from 07:27 to 07:57 UT on 18 June 2005. Comparison of these images to the Digitized Sky Survey reveals the presence of a single new or brightened object within the localization region, at coordinates RA 19:00:08.65, Dec -24:55:13.7 (J2000), with estimated coordinate uncertainty of 0.2". The brightness of the counterpart, by reference to the USNO B-1.0 catalog, is estimated to be to be R ~ 18.4 mag. We tentatively identify this object as the optical counterpart of HETE J1900.1-2455. Images and a finding chart for the candidate may be found at http://www.astro.caltech.edu/~derekfox/hetej1900.1-2455/.
2005-06-19 12:34:00
infra-red,optical,x-ray,binary,neutron star,pulsar,star,transient
2005-06-19
12:34:00
912
[ -0.04381507635116577, -0.004208301194012165, 0.027894796803593636, 0.005484578665345907, 0.03657834976911545, -0.09146419912576675, 0.023371253162622452, 0.005891607608646154, -0.016272809356451035, -0.013175557367503643, 0.004957158584147692, -0.005223101936280727, 0.04178790748119354, -0.04677306115627289, 0.005054389592260122, -0.015436914749443531, 0.0973946824669838, -0.08981636166572571, -0.023345012217760086, 0.010886194184422493, -0.023116586729884148, 0.039820216596126556, -0.024210603907704353, -0.0020279784221202135, 0.07957028597593307, 0.03238140046596527, 0.027370566502213478, -0.07268262654542923, -0.024142513051629066, -0.05588722974061966, -0.020678669214248657, 0.060132693499326706, -0.06454038619995117, 0.027173299342393875, 0.05177193135023117, -0.005997717380523682, 0.021351614966988564, -0.05382942408323288, -0.0032097813673317432, 0.019213581457734108, 0.0018774658674374223, -0.07743582129478455, -0.00868808664381504, -0.06927438080310822, -0.03268234059214592, 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525
527
Swift Observations of SAX J1808.4-3658
Albert K. H. Kong (MIT)
We report Swift observations of the transient millisecond pulsar SAX J1808.4-3658 which is currently in outburst. SAX J1808.4-3658 was observed with Swift on 2005 June 16. The source was clearly detected in the X-ray Telescope images and it is bright enough to show significant pile-up in the 787s Photon Counting mode data. We extracted the spectrum from the 119s Windowed Timing data and performed spectral fit. The spectrum can be fitted with an absorbed power-law model with N_H=2.3e21 cm^-2 and photon index of 2.2. The absorbed 2-10 keV flux was 2.8e-10 ergs/cm^2/s which is about a factor of 2.7 fainter than the Chandra observation taken on June 10 (ATEL #517). No X-ray bursts were detected. The optical counterpart of SAX J1808.4-3658 was also clearly detected in the Swift UV/Optical Telescope V-band image. The exposure through the V filter is 907s and the source was detected with V=18.5+/-0.1. This is about 1 magnitude fainter than previous observations taken in early June (ATEL #511 and #515). The simultaneous X-ray/optical observations indicate that SAX J1808.4-3658 is in the decay stage of the outburst.
2005-06-19 14:32:00
optical,x-ray,binary,neutron star,pulsar,star,transient
2005-06-19
14:32:00
1,124
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526
528
IGR J12349-6434 = RT Cru ?
N. Masetti, L. Bassani (IASF/INAF, Bologna), A. J. Bird (Univ. Southampton) and A. Bazzano (IASF/INAF, Rome)
We report that, further to the discovery of the new INTEGRAL source IGR J12349-6434 (Chernyakova et al., ATel #519), a SIMBAD catalog search pointed out that the source position is consistent with the emission-line symbiotic star RT Cru. This optical object shows large-amplitude (Dm ~ 3.8 mag) outbursts and short-term flickering (see Cieslinski et al., 1994, A&AS, 106, 243), both typical of accreting binary systems; moreover, this is the only SIMBAD source within the IGR J12349-6434 error box. We therefore tentatively suggest that this object is the optical counterpart of IGR J12349-6434. Observations at other (soft X-ray and/or radio) wavelengths would be of help in clarifying this association. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.
2005-06-21 21:32:00
radio,optical,x-ray,binary,cataclysmic variable,star,variables,a comment
2005-06-21
21:32:00
793
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0.00874998141080141, -0.05799419432878494, 0.016589896753430367, 0.008125495165586472, -0.0701792985200882, 0.10007332265377045, -0.03847073018550873, -0.06366979330778122, -0.011081870645284653, -0.004794179927557707, -0.05977340787649155, 0.04885724186897278, -0.039836715906858444, -0.054273687303066254, -0.10133830457925797, -0.030813632532954216, -0.046339500695466995, -0.040111515671014786, 0.007994775660336018, 0.004564560018479824, 0.06954775750637054, -0.0662473812699318, -0.08275831490755081, -0.03448841720819473 ]
527
529
Swift Observations of SAX J1808.4-3658
S. Campana (INAF-OAB), L. Stella (INAF-OAR), G. L. Israel (INAF-OAR), T. Belloni (INAF-OAB), C. Pagani (INAF-OAB/PSU), D. N. Burrows (PSU), N. Gehrels (GSFC)
Swift observed SAX J1808.4-3658 during its outburst phase. The observation started on June 16 2005 UT00:42:51. A first report was presented by Kong (ATEL 527). Here we report on Photon Counting (PC) data and Window Timing (WT) data together. The source was observed for 784 s in PC and 119 s in WT. The source is bright and appears well off-axis on the PC image (and at the border of the WT strip). The count rate in WT is 12.26+/-0.32 c/s (0.5-10 keV). In PC the source is heavily piled-up (with a hole at the image center). We extracted photons from an annular region to avoid pile-up and generate the appropiate response matrix. We adopted the same absorbed black body + power law spectrum as in ATEL (517, Chandra HETG). The fit is good and the black body component is highly significant (F-Test probability of 1.5E-05). The column density is (1.1+/-0.3)x10^20 cm-2 (consistent with the Galactic value). The black body temperature is 0.63+/-0.11 keV and the power law photon index 2.1+/-0.2 (all errors are 90% confidence level for one parameter of interest). The WT fluxes (less affected by pile-up correction and better calibrated) are: 2-10 absorbed : (2.5+/-0.2)E-10 erg/cm2/s 0.5-10 unabsorbed: (5.4+/-0.3)E-10 erg/cm2/s
2005-06-21 23:13:00
x-ray,binary,neutron star,star,transient
2005-06-21
23:13:00
1,229
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528
530
Radio observations of HETE J1900.1-2455
M. P. Rupen (NRAO/GSFC), A. J. Mioduszewski, V. Dhawan (NRAO)
Very Large Array (VLA) observations of the HETE transient and millisecond pulsar HETE J1900.1-2455 (see ATels #516, #523, #525, #526) show one radio source in an ~5.4-arcmin field-of-view centered on the nominal HETE position (ATel #516). The flux density of this source in these 8.46 GHz observations was 2.4 +/- 0.1 mJy on June 19, and 2.3 +/- 0.2 mJy on June 21. The position (J2000) is 19 00 09.77 +/- 0.01 -24 54 04.3 +/- 0.1 where the error bars reflect the signal-to-noise ratio of the images and the discrepancy between the positions measured independently on the two days. This is consistent with both the HETE (ATel #516) and the RXTE PCA (ATel #525) error circles. The source is unresolved with our 3.8 x 1.4 arcsec beam. The NRAO VLA Sky Survey (NVSS; Condon et al. 1998, AJ 115, 1693) shows a source at the same position, with a flux density of 4.1 +/- 0.6 mJy at 1.4 GHz on June 4, 1996. Given the lack of variability, this is likely an unrelated background source. There is no obvious source at this position in the 2MASS images. Apart from the above source, there is no radio source in the VLA's field-of-view, with an rms noise level of 0.055 mJy/beam on June 19, and 0.094 mJy/beam on June 21. The extrema within the region of overlap between the HETE and RXTE PCA error circles were (-0.21, +0.21 mJy/beam) on June 19, and (-0.38, +0.35 mJy/beam) on June 21. The nominal flux density at the position of the proposed optical counterpart (ATel #526) was -0.059 +/- 0.055 mJy/beam on June 19, and -0.053 +/- 0.094 mJy/beam on June 21. At least one further observation is planned. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
2005-06-21 23:18:00
radio,optical,x-ray,binary,pulsar,transient
2005-06-21
23:18:00
1,758
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531
New outburst of accreting X-ray pulsar IGR J11435-6109
M. Revnivtsev (MPA, Garching; IKI, Moscow), S. Molkov, S. Grebenev (IKI, Moscow)
During INTEGRAL deep observations of the Galactic Plane in the region of the Crux spiral arm a new outburst of the accreting X-ray pulsar IGR J11435-6109 (ATEL #350, #358, #359, #362, #370, #377) was detected. The source brightness in the energy band 17-60 keV gradually increased from <0.5mCrab on June 2-10, 2005 up to ~15 mCrab on June 20-21, 2005. Observations in all wavelengths are encouraged.
2005-06-22 01:20:00
x-ray,binary,pulsar,transient
2005-06-22
01:20:00
399
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530
532
Classification of SN in IC 1496
The Nearby Supernova Factory: N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
The Nearby Supernova Factory reports that a spectrum (range 320-1000 nm) of a supernova in IC 1496 (Weidong Li, private communication), obtained June 21.4 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-m telescope, shows it to be a Type Ia SN approximately one month past maximum light. The spectrum is similar to those of SNe 2000cx at +28d (Li et al. 2001 PASP 113, 1178), 1999ac at +28 d (Garavini et al., ApJ accepted), and 1992A at +24 d (Kirshner et al. 1993 ApJ 415, 589).
2005-06-22 02:25:00
optical,supernovae
2005-06-22
02:25:00
514
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531
533
Near-infrared observations of HETE J1900.1-2455
D. Steeghs (CfA), M. A.P. Torres (CfA), C. Blake (CfA), J. S.Bloom (UCB)
We report on near-infrared (NIR) observations of the field containing the burst source and millisecond pulsar candidate HETE J1900.1-2455 (ATEL #516, #523) obtained with the 1.3m robotic PAIRITEL telescope on Mt. Hopkins, AZ. A NIR counterpart to the optical candidate suggested in ATEL #526 was detected on 2005 June 16 08:00 UT at J=17.6 +/- 0.2 using nearby 2MASS comparison stars. Follow-up observations on 2005 June 18 07:30 UT indicated that no significant brightness changes had occurred in the NIR, with the source again detected at J=17.6 +/- 0.2. We also detected a marginally extended NIR source at the position of the sole radio source that lies within the HETE error circle (ATEL #530). The NIR counterpart was detected at J=18.1 +/- 0.2 on both June 16 and 18. Its extended nature and the lack of variability in both the radio and NIR suggests it is likely an unrelated background source. None of the NIR sources detected within the HETE/XTE error circle showed evidence for significant variability between our two epochs. We plan to acquire additional observations of the field as weather permits.
2005-06-22 09:10:00
radio,infra-red,optical,x-ray,binary,neutron star,pulsar,star,transient
2005-06-22
09:10:00
1,115
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-0.014474419876933098, 0.00916493684053421, -0.023928772658109665, -6.160047405501246e-8, 0.001749469549395144, 0.00013001798652112484, -0.07629076391458511, 0.021049797534942627, 0.029021326452493668, -0.05099306255578995, 0.010341880843043327, 0.01736341044306755, -0.016506342217326164, 0.031058089807629585, 0.03184269368648529, -0.016306016594171524, 0.05890848860144615, -0.02470298297703266, 0.08623885363340378, -0.05507529526948929, 0.02084450237452984, -0.10021570324897766, -0.010957037098705769, 0.07336839288473129, 0.01639731414616108, 0.056514933705329895, 0.08876372873783112, -0.04817480593919754, -0.03287298232316971, 0.06822129338979721, -0.027135547250509262, 0.04788491502404213, 0.0011978739639744163, -0.051305752247571945, 0.03198881819844246, -0.01691993698477745, 0.031536076217889786, -0.060983724892139435, 0.00996132381260395, 0.06142645329236984, -0.05767931416630745, 0.06116427108645439, 0.04225563257932663, 0.07838979363441467, -0.02940215915441513, -0.017266782000660896, -0.022288853302598, 0.015252423472702503, -0.11521098017692566, 0.043903984129428864, -0.039307851344347, -0.11340610682964325, -0.0821884348988533, -0.07830940932035446, -0.10212662070989609, 0.019466638565063477, 0.0315629206597805, -0.0513312891125679, -0.050962895154953, 0.021072227507829666, -0.007314468268305063, -0.12624356150627136, -0.06873111426830292, 0.0001194466749439016, 0.10454118996858597, -0.041343916207551956, -0.11549899727106094, 0.06315559148788452 ]
532
534
Estimated Distance to HETE J1900.1-2455
N. Kawai (TiTek) and M. Suzuki (RIKEN) for the HETE Team
We have performed further analyses of the initial X-ray outburst of HETE J1900.1-2455 reported in Atel #516 and GCN Circular #3548. With time-resolved spectral analysis, we find that its spectrum is consistent with a blackbody throughout the burst for a duration of 30 seconds. For the first 12 seconds, the bolometric flux stayed almost constant at 9 x 10^-8 erg/s/cm^2 while the spectral temperature dropped in the middle. The temperature reached a peak at 2.4 keV, and then gradually decreased. These features are all consistent with a type-I X-ray burst with photospheric expansion. If we take the ceiling energy flux as due to the Eddington limit of a neutron star with a mass of 1.4 solar mass and He atmosphere, the distance to the source is estimated as 5 kpc.
2005-06-23 04:17:00
x-ray,binary,neutron star,pulsar,star
2005-06-23
04:17:00
768
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533
535
Swift XRT observation of HETE J1900.1-2455
INAF-OAB
Sergio Campana (INAF-OAB), Antonino Cucchiara (PSU) and Dave Burrows (PSU) on behalf of the XRT team report that Swift observed the seventh millisecond X-ray pulsar HETE J1900.1-2455 on 2005-06-24 UT21:03:37 for 1329 s in a single orbit. The source is bright an is observed in Window Timing (WT) mode, therefore not providing an image. The source count rate in the 0.5-10 keV energy band is 14.9+/-0.1 c/s. We extract the spectrum and generate the relevant response matrix. The spectrum can be fit with an absorbed black body plus power law model: NH=(1.6+/-0.4)x10^21 cm-2, kT=0.64+/-0.06 keV and Gamma=1.7+/-0.1 (all errors are 90% confidence level for one interesting parameter). The derived column density is consistent with the Galactic value. The 0.5-10 keV unabsorbed flux is (7.0+/-0.1)x10^-10 erg/cm2/s. Given the temporal resolution in WT mode the neutron star pulsation is not detectable. No orbital modulation is apparent from the data.
2005-06-25 15:23:00
x-ray,binary,neutron star,pulsar,star,transient
2005-06-25
15:23:00
948
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534
536
V4641 Sgr X-Ray Activity
J. H. Swank (NASA/GSFC), E. A. Smith (NASA/GSFC & L-3), & C. B. Markwardt (Univ. MD and NASA/GSFC)
In response to reports on vsnet-alert (by Stubbings, Uemura, Kubota, Akira, and Monard) that V4641 Sgr was exhibiting significant optical activity, RXTE carried out a short pointing (16 minutes) to check whether the source is also X-ray active. We observed June 25.338-25.370, slightly overlapping an optical observation by Stubbings. We observed an average of 8.6e-11 ergs/cm2/s 2-10 keV and 6.4e-10 ergs/cm2/s 10-60 keV. The spectrum was hard (photon spectral index 0.80) with strong (1.6 keV equivalent width) fluorescent Fe line emission. The source was variable by a factor of 5 in flares with a time scale of 100s, similar to the activity shown in low level outbursts in 2002, 2003, and 2004. Additional RXTE observations are being planned.
2005-06-26 06:05:00
optical,x-ray,black hole,transient,variables,request for observations
2005-06-26
06:05:00
746
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-0.0928354412317276, -0.03347063437104225, -0.00032972736516967416, 0.02944863960146904, -0.09361723810434341, 0.030700912699103355, -0.05482124537229538, -0.11991293728351593, 0.01825709082186222, -0.08321563154459, 0.0550273135304451, -0.04159357026219368, -0.041201043874025345, -0.04532299563288689, -0.13903051614761353, -0.038890525698661804, -0.0055929142981767654, 0.008565884083509445, -0.016158660873770714, -0.03880009427666664, 0.08936278522014618, -0.10574899613857269, -0.06490910053253174, -0.0015168930403888226 ]
535
537
Candidate AGN in the 2nd IBIS/ISGRI survey catalogue
Bassani, L., Malizia A. (IASF/INAF, Bologna, Italy), Molina M., Dean A. J. (University of Southampton, Southampton, UK), Ubertini P., Bazzano A. (IASF/INAF, Roma, Italy), Walter R.(ISDC, Genevea, Switzerland), Lebrun F. and P. Laurent (CEA, Saclay, France)
On behalf of the IBIS Core Programme AGN and survey teams we report that the following sources in the forthcoming second IBIS/ISGRI catalogue (Bird et al. 2005 to be submitted to Ap.J.) are likely to be Active Galactic Nuclei (AGN): NAME [RA(2000) Dec(2000)] Radio counterpart [RA(2000) Dec (2000)] IGR J10404-4625 160.095 -46.416 SUMSS J104022-462525 10 40 22.23 -46 25 25.6 LEDA 170194 189.796 -16.182 NVSS J123911-161041 12 39 11.74 -16 10 41.3 4U1344-60 206.872 -60.604 -------------------------- ------------- ------------- IGR J16482-3036 252.040 -30.593 NVSS J164816-303507 16 48 16.60 -30 35 07.5 2E1853.7+1534 284.008 +15.621 NVSS J185600+153755 18 56 00.51 +15 37 55.2 All sources except 4U1344-60 have a radio counterpart (either NVSS or SUMSS as in the table above) and are also 2 MASS extended sources classified as galaxies. IGR J10404-4625 and LEDA 170194 are emission line galaxies at redshift 0.0239 and 0.0367 respectively, although they have not yet been optically classified. Except for LEDA 170194, all are X-ray emitting objects; the bright source 4U1344-60 has recently been detected by XMM and suggested to be a low galactic latitude, low redshift active galaxy (Michel et al.2004, ASP Conf. Series 314, 570). Optical follow-up is required for these sources to provide final confirmation of their nature, but on the basis of the above characteristics they can already be tentatively classified as AGN.
2005-06-28 22:36:00
radio,optical,x-ray,gamma ray,agn
2005-06-28
22:36:00
1,427
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536
538
Orbital parameters of HETE J1900.1-2455
Philip Kaaret (U. Iowa), Ed Morgan, and Roland Vanderspek (MIT)
We have measured the binary orbit of the millisecond X-ray pulsar HETE J1900.1-2455 (ATEL #523) in RXTE PCA observations made during June 17 to 25. Using the position of the tentative optical counterpart (ATEL #526), we find an orbital period of 4995.24(3) s, a projected semimajor axis of 18.39(2) lt-ms, and an epoch of 90 degrees mean longitude of 53539.02765(3) MJD (TT). Addition of eccentricity does not improve the fit and we place an upper bound on the eccentricity of 0.005. The source flux was 7.5E-10 erg cm^-2 s^-1 in the 2-20 keV band on June 25 and has continued to brighten. Observations to refine the X-ray position are encouraged.
2005-06-29 02:58:00
optical,x-ray,binary,neutron star,pulsar,star,transient
2005-06-29
02:58:00
647
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537
539
HETE-2 detction of Superburst from SLX 1735-269
M. Suzuki (RIKEN) and N. Kawai (Tokyo Tech) for the HETE team
A long-duration X-ray burst from SLX 1735-269 was detected at 2:17 UT on 20 June 2005 by WXM and FREGATE onboard HETE-2. This burst lasted at least for 24 minutes until the spacecraft made a slew. The long duration of this burst suggests that this event belongs to the class of so-called "superbursts". A superburst from this source had been detected 644 days before by INTEGRAL on 15, Sep. 2003 (Molkov et al. 2005, A&A, 434, 1069). Molkov et al. incorrectly state that there was only one detected X-ray burst from this source before the INTEGRAL launch. However, HETE-2 had detected three type-I X-ray bursts from this source in 2001 (Sakamoto et al. 2002, AIP Conf. Proc. 662, 94). These three bursts had comparable peak flux (~ 2 Crab) with that of the current superburst, though their durations were much shorter, being only 5--10 secconds.
2005-06-30 00:47:00
x-ray,binary,neutron star,star
2005-06-30
00:47:00
845
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0.011004991829395294, 0.019336428493261337, 0.032345306128263474, 0.04153817147016525, -0.0017937271622940898, 0.09773629158735275, -0.00963803380727768, -0.04688306152820587, 0.012101865373551846, -0.022516362369060516, 0.011344054713845253, -0.018609916791319847, 0.00444790767505765, -0.059790290892124176, -0.017671119421720505, 0.05402511730790138, -0.0007471690187230706, -0.13390499353408813, 0.0007671677740290761, 0.04300539940595627, 0.055365223437547684, -0.07527580112218857, -0.04326622933149338, 0.05226130411028862 ]
538
540
V4641 Sgr entering new period of activity
I. Khamitov, M. Parmaksizoglu, Z. Tunca, Z. Aslan (TUG),R. Burenin, M. Revnivtsev, M. Pavlinksy, R. Sunyaev (IKI),I. Bikmaev, N. Sakhibullin (KGU)
We observed V4641 Sgr with 1.5-m Russian-Turkish telescope (RTT150) on June 27 from 00:08 till 00:53(UT) in response to HETE alert distributed through Bacodine. The observations were continued during the following two nights on June 27 from 21:24 till June 28 00:53 (UT) and on June 28 from 22:02 till 23:41 (UT). The source was variable during the first night in Rc filter in a time scale of approximately 30 minutes and was brighter by 0.1 mag than the corresponding phase in its light curve in quiescence, showing that source is now entering a new period of activity. The variability is growing, reaching a level about 1 mag above the light curve in the third night of observations. Similar brightening above the phased light curve was observed during the period of activity in 2004 between the optical flares (Revnivtsev et al., ATEL 297; Bikmaev et al., ATEL 309). The phased light curve with June 26, 27 and 28 data points can be found at: http://www.tug.tubitak.gov.tr/~irekk/V4641Sgr/2005/phase_2005June.jpg The light curve with the June 28 data points where we see strong variability can be found at: http://www.tug.tubitak.gov.tr/~irekk/V4641Sgr/2005/lc20050628.jpg We therefore confirm RXTE findings in X-rays (Swank et al., ATEL 536) and earlier VSNET alert. Further observations at all wavelengths are encouraged.
2005-06-30 01:09:00
optical,x-ray,binary,black hole,variables,request for observations
2005-06-30
01:09:00
1,326
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539
541
Swift XRT imaging observation of HETE J1900.1-2455
A. K.H. Kong, J. Homan, and W. H.G. Lewin (MIT)
We have obtained a Swift TOO observation of the millisecond X-ray pulsar HETE J1900.1-2455 on 2005 June 29 UT 21:36:06 for about 900s. The X-ray Telescope (XRT) observation was done in Photon Counting (imaging) mode. The source is clearly detected with significant pile-up. The bright point source is located at R.A.=19:00:08.4, Decl.=-24:55:16. We estimated an uncertainty of 5 arcsec. The millisecond X-ray pulsar is the only X-ray source in the field of view of the XRT. Optical and infrared observations are encouraged to locate the optical/IR counterpart.
2005-06-30 09:40:00
optical,x-ray,binary,neutron star,pulsar,star,transient
2005-06-30
09:40:00
560
[ -0.027144555002450943, -0.05134150758385658, -0.06155141443014145, -0.006666580215096474, 0.003965242765843868, -0.05565162003040314, -0.004522501956671476, 0.01215044129639864, -0.0025895729195326567, -0.04196489602327347, 0.06100936233997345, -0.0127687593922019, 0.041522905230522156, -0.029050929471850395, -0.024326547980308533, -0.015033215284347534, -0.03125840052962303, -0.10650208592414856, 0.04855765402317047, 0.008940705098211765, -0.00961819477379322, 0.013069018721580505, -0.03931548818945885, -0.032454974949359894, 0.022351719439029694, -0.026339376345276833, -0.023248590528964996, -0.154134139418602, 0.004457559902220964, -0.053911369293928146, 0.016728803515434265, 0.03997357562184334, -0.0039612608961761, 0.05359821766614914, 0.021490056067705154, 0.02411823160946369, 0.0669480487704277, -0.05589714273810387, 0.02279905043542385, -0.038992684334516525, -0.04986589029431343, -0.06611306220293045, -0.000559392967261374, -0.011289082467556, -0.049596503376960754, 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540
542
OIR activity in V4641 Sgr
M. Buxton, C. Bailyn, D. Maitra (Yale University)
We have obtained V- and H-band images of V4641 Sgr using the ANDICAM instrument on the SMARTS 1.3m telescope at CTIO. Images taken on UT 2005 June 26.3 show that V4641 had significantly increased in brightness with respect to average quiescent magnitudes. The H-band magnitude for this time was 11.6 and V-H = 1.63. Data taken on UT 2005 June 29.2 and 30.3 indicate that V4641 Sgr has returned to average quiescent magnitude levels in both V- (~ 13.7 mag) and H-band (~ 12.6 mag) with V-H = 1.1. We will continue to monitor this object at optical and infrared wavelengths on a daily basis (weather permitting).
2005-06-30 23:31:00
infra-red,optical,binary,black hole,transient
2005-06-30
23:31:00
610
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541
543
Optical photometry and spectroscopy of HETE J1900.1-2544
D. Steeghs(CfA), M. A.P. Torres (CfA), M. R.Garcia (CfA), J. E.McClintock (CfA), J. M.Miller (CfA), P. G.Jonker (CfA/SRON), P. J.Callanan (Cork University), P. Zhao (CfA), P. Berlind (CfA), R. Hutchins (CfA), C. Watson (Sheffield)
We report optical photometry and spectroscopy of the candidate optical/NIR counterpart (ATEL #526, #533) to the millisecond X-ray pulsar HETE J1900.1-2455 (ATEL #516, #523, #538). Its consistency with the recent SWIFT localisation (ATEL #541) and our ground-based observations confirm its association with the X-ray source. Photometry was acquired with the FLWO 1.2m telescope (Mt. Hopkins, AZ) and the Swope 1.0m telescope (LCO, Chile) during June 20,25,26,27,30 2005 UT. Our observations typically consist of multiple 240/300s exposures in different bandpasses. The observations took place under variable seeing ranging 0.7-1.5 arcsec at Las Campanas and 2.3-2.7 arcsec at FLWO. The LCO images were calibrated using Landolt standard stars and the extinction coefficients from Landolt (1992) to estimate the photometric zero points with an accuracy of <0.1 mag. We measure the following mean magnitudes for the optical counterpart suggested in ATEL#526; V=18.09 +/- 0.03, R=18.02 +/- 0.03, I=17.88 +/- 0.02 (PSF photometry). De-reddening the colors using the N_H from ATEL #535 indicates an intrinsically blue spectrum for this object with (V-R)_0 = -0.16, (R-I)_0 = -0.08. Our monitoring data show no signs for a steady brightness trend across the June 20-30 baseline, with variations less than 0.1 mag between epochs. Our LCO frames resolve a nearby fainter point source, 2-2.5" NW of the counterpart (see linked finding chart). This source is present in archival POSS-II plates and is 2 magnitudes fainter in the R-band compared to the pulsar counterpart. Given the lack of an archival source at the position of the pulsar counterpart, the outburst amplitude is thus at least 2 mags compared to the plate epochs. In addition, a 45-min spectrum of the tentative optical counterpart was acquired on June 28.25 2005 (UT) with the FAST spectrograph attached to the 1.5-m telescope at the FLWO, achieving a S/N of ~30 per pixel and covering 3700-7500 Angstrom. The only significant emission feature detected was a broad emission line at 4686 Angstrom corresponding to HeII. The spectrum is contaminated by a nearby field star that was also in the wide slit, limiting our ability to determine Balmer emission components. However it is clear that such Balmer emission is at most very weak. The positional coincidence with the SWIFT X-ray source position, its large brightness increase relative to archival plates, its blue colour typical of accreting sources and the detection of a broad emission line all favour this source to be the optical counterpart to HETE J1900.1-2455.
2005-07-01 06:38:00
infra-red,optical,x-ray,binary,neutron star,pulsar,star,transient,variables
2005-07-01
06:38:00
2,578
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542
544
Discovery of SNF20050621-001, a Type Ia Supernova
N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
The Nearby Supernova Factory reports the discovery of supernova SNF20050621-001 (coordinates RA 20:45:16.8 DEC -03:49:35.7 J2000.0) in images obtained June 21.5 UT and 27.5 with approximate magnitudes of 19.6 and 19.7 respectively (calibrated to R) using the QUEST II camera on the Palomar Oschin 48-inch telescope as a part of the JPL Near-Earth Asteroid Tracking component of the Palomar Consortium. A spectrum (range 320-1000 nm) of this object, obtained June 28.6 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, shows it to be a Type Ia SN at an approximate redshift of z = 0.11. The spectrum most closely resembles that of SN 1990N taken three days past B maximum (Lira et al., 1998 AJ, 115, 234), and includes P-Cygni profiles of Si II, S II and Ca II.
2005-07-01 09:01:00
optical,asteroid,supernovae
2005-07-01
09:01:00
809
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-0.010155385360121727, -0.032774653285741806, 0.058181602507829666, -0.03977159038186073, -0.012936471030116081, -0.01828412339091301, 0.0013540206709876657, -0.004365615081042051, 0.06641735136508942, -0.0011862199753522873, 0.04013777896761894, -0.03070046193897724, -0.03213272988796234, 0.008861870504915714, 0.003923451527953148, -0.08941895514726639, 0.015374324284493923, 0.018370795994997025, 0.03247794881463051, 0.11078131943941116, -0.0549338236451149, -0.04314691573381424, 0.0226899366825819 ]
543
545
New INTEGRAL source IGR J11321-5311
R. Krivonos(IKI, MPA), S. Molkov(IKI), M. Revnivtsev(MPA, IKI), S. Grebenev(IKI), R. Sunyaev(MPA, IKI),A. Paizis(ISDC, IASF)
The new bright transient source has been found during deep observations of the Crux spiral Arm (PI Revnivtsev). The source was seen by IBIS/ISGRI detector aboard INTEGRAL above the background at level of ~10 standard deviations (17-60 keV) starting at 21:00 till 23:27 June 27. The source position was determined by IBIS/ISGRI: R.A.= 11h 32.1', Dec.= -53d 11m, (equinox 2000.0) with an error radius of 2.0'. The transient demonstrated very hard spectrum with fluxes ~30 mCrab and ~90 mCrab in 17-60 and 60-200 keV energy bands correspondingly, that may indicate that the source is a black hole binary. After approximately 2-3 hours of activity the source diminished its flux below ~3 mCrab in 17-60 keV energy band. We encourage follow-up observations of this source at all wavelengths.
2005-07-01 21:18:00
x-ray,gamma ray,binary,black hole,transient,variables,request for observations
2005-07-01
21:18:00
786
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544
546
BAT detection of a new gamma ray source SWIFT J1753.5-0127
D. M. Palmer (LANL), S. D. Barthelmey (GSFC), J. R. Cummings (NRC/GSFC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (UMD/GSFC),T. Sakamoto (NRC/GSFC), J. Tueller (GSFC)
Swift BAT reports the detection of a new gamma source SWIFT J1753.5-0127 at (ra,dec) = (268.38, -1.46) (J2000) with a 3 arcminute error radius (combined systematic and statistical with 90% containment). The light curve shows large variability up to hundreds of millicrab on sub-hour timescales with at least three detected peaks around 2005-06-30 18:40, 2005-06-30 23:32, and 2005-07-01 10:40 UT. The earliest detection of the source is at 2005-05-30 12:05 UT. There are no known gamma-ray sources at this position according to SIMBAD, the INTEGRAL Transient Pages, and the XTE ASM. Swift will make a Target of Opportunity observation of this source.
2005-07-02 04:03:00
x-ray,gamma ray,transient,request for observations
2005-07-02
04:03:00
652
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545
547
Swift XRT position for SWIFT J1753.5-0127
D. N. Burrows, J. Racusin, D. C. Morris, P. Roming, M. Chester, R. La Verghetta (PSU), C. B. Markwardt (UMD/GSFC), S. D. Barthelmy (GSFC)
The Swift BAT detected a new transient X-ray source (Palmer et al. ATEL #546), first detected by the BAT on 30 June 2005. At 21:20 UT on 1 July 2005 this source was uploaded to Swift as a Target of Opportunity. The XRT began observing this target in Manual State in Photon-Counting mode (count rate about 35 cps, which is highly piled-up), but was switched to Image mode and then put back into Windowed Timing mode. From the Image Mode image we obtain an on-board position for the source of: RA(J2000) = 17h 53m 28.3s Dec(J2000) = -01d 27' 09.3" The estimated uncertainty is 6 arcseconds radius (90% containment). The source was extremely bright, with count rates up to at least 200 cps (average count rate was about 130 cps).
2005-07-02 06:18:00
x-ray,transient
2005-07-02
06:18:00
729
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-0.05878475680947304, 0.014278402552008629, -0.028786296024918556, 0.07210202515125275, -0.027485797181725502, -0.003828577231615782, -0.015387771651148796, -0.09949558228254318, -0.05279381573200226, -0.033641062676906586, -0.003089245641604066, -0.014441064558923244, -0.03551030158996582, -0.0038789508398622274, -0.025583907961845398, 0.03673906624317169, 0.01394844800233841, -0.13139384984970093, -0.04806392639875412, 0.09111295640468597, 0.06268228590488434, -0.09180086106061935, -0.07533875107765198, 0.0013871066039428115 ]
546
548
Discovery of SNF20050625-004, a Type II Supernova
The Nearby Supernova Factory: N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
The Nearby Supernova Factory reports the discovery of supernova SNF20050625-004 (coordinates RA 17:37:44.2 DEC +11:09:03.7 J2000.0) in images obtained June 25.4 UT with an approximate magnitude of 19.2 (calibrated to R) using the QUEST II camera on the Palomar Oschin 48-inch telescope as a part of the JPL Near-Earth Asteroid Tracking component of the Palomar Consortium. A spectrum (range 320-1000 nm) of this object, obtained June 28.5 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, shows it to be a Type II SN. The spectrum is similar to that of the Type IIP SN 1999em one month after explosion redshifted to z ~ 0.016 (assuming explosion date 1999 October 27 from Hamuy et al. 2001 ApJ 558, 615).
2005-07-02 10:12:00
optical,asteroid,supernovae
2005-07-02
10:12:00
753
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547
549
Optical Couterpart of SWIFT J1753.5-0127
J. P. Halpern
Observing on the MDM 2.4m telescope on 2005 July 2 04:40 UT, I find a bright optical counterpart of SWIFT J1753.5-0127 as reported in ATEL #546 and ATEL #547. A new star at (J2000) 17h53m28.3s, -01d27m06s (uncertainty radius ~1"),within the Swift XRT error circle, but not visible on the DSS, has R~15.8 in comparison with a nearby USNO B1.0 star.
2005-07-02 13:16:00
optical,x-ray,star,transient
2005-07-02
13:16:00
347
[ -0.023045746609568596, -0.0706138014793396, 0.01973855495452881, 0.0036619524471461773, 0.034017082303762436, -0.10723602771759033, -0.017073649913072586, -0.013661261647939682, -0.05939241126179695, -0.028943605720996857, -0.018340446054935455, -0.008707170374691486, -0.013296910561621189, -0.010687385685741901, -0.013047521002590656, -0.008028479292988777, 0.04849313572049141, -0.052327681332826614, 0.05253540724515915, -0.0024078618735074997, -0.022188987582921982, 0.032902806997299194, 0.009577909484505653, 0.032027605921030045, 0.051721006631851196, -0.03659435734152794, 0.037778694182634354, -0.054357342422008514, 0.01183245237916708, -0.05647585168480873, 0.05815964937210083, 0.04548107460141182, -0.009738944470882416, 0.01975591666996479, 0.02430552802979946, -0.05998188257217407, 0.12058278173208237, -0.07005389034748077, 0.04235716536641121, -0.03563059866428375, -0.02461615763604641, -0.005035444162786007, 0.018694976344704628, 0.055434517562389374, -0.050777990370988846, 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RXTE observations of Swift J1753.5-0127
Ed Morgan (MIT), Jean Swank (NASA/GSFC), Craig Markwardt (Univ. MD and NASA/GSFC), and Neil Gehrels (NASA/GSFC)
Analysis of the ASM data of SWIFT J1753.5-0127 (Atel #546) using the Swift position (Atel #547) show that the outburst began on 2005 June 29, rising to a level of 140 mCrab on July 1. An observation made with the PCA on July 1 at 01:00 UT shows the source at 120 mCrab. The PDS of the PCA observation shows a 0.6 Hz QPO with a shape typically seen in BH Candidates.
2005-07-03 03:53:00
x-ray,black hole
2005-07-03
03:53:00
365
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551
Optical Spectroscopy of SWIFT J1753.5-0127
M. A. P. Torres (CfA), D. Steeghs (CfA), M. R. Garcia (CfA), J. E. McClintock (CfA), J. M. Miller (CfA), P. G. Jonker (CfA/SRON), P. J. Callanan (University College, Cork), P. Zhao (CfA), J. Huchra (CfA), Vivian U (CfA), C. Hutcheson (CfA)
Spectra of the optical counterpart to the gamma ray source SWIFT J1753.5-0127 (ATEL #546,#547,#549,#550) were acquired on 2005 July 3th 03:52-09:48 UT with the FAST spectrograph mounted at the F. L. Whipple Observatory 1.5m telescope. The spectra show a blue continuum with Halpha being the only emission line detected in the averaged spectrum (S/N~30 at Halpha). This line has an equivalent width of ~3 angstroms and FWHM~2000 km/s. The NaD doublet at 5890/96 angstroms is also evident with an equivalent width of ~1.5 angstroms. We encourage follow-up observations of this source at all wavelengths.
2005-07-03 20:42:00
optical,gamma ray,black hole,transient,request for observations
2005-07-03
20:42:00
602
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550
552
X-ray spectroscopy for Swift J1753.5-0127
D. C. Morris, D. N. Burrows, J. Racusin, P. Roming, M. Chester, R. La Verghetta (PSU), C. B. Markwardt (UMD/GSFC), S. D. Barthelmy (GSFC)
The Swift XRT observed J1753.5-0127 starting on July 1st, 2005 at 21:28 UT. The observation revealed a variable source with a power-law spectrum. The spectrum is best fit by a power-law with absorption slightly greater than the total galactic column density in this direction of 1.7e21: nH = 2.0e21 ± 3.7e19 PhoIndex = 2.11 ± 1.1e-2 The source is observed to vary on timescales of 10s of seconds between fluxes of 2.9e-9 to 3.7e-9 erg/cm2/s with shorter timescale spikes (seconds) to 4.8e-9erg/cm2/s (all fluxes 0.5-10keV). No significant difference in spectral parameters is noted between the high and low flux states.
2005-07-04 04:01:00
x-ray,transient,variables
2005-07-04
04:01:00
621
[ -0.05613340809941292, -0.07290656119585037, -0.04280712082982063, 0.05123836547136307, 0.08052071928977966, -0.020200395956635475, -0.019019493833184242, 0.0785960927605629, 0.027499789372086525, -0.011585824191570282, 0.024472398683428764, -0.08163368701934814, 0.010736924596130848, -0.001586694037541747, 0.037796348333358765, -0.030210988596081734, 0.055890388786792755, -0.06441987305879593, -0.0064607420936226845, 0.06596419960260391, 0.030602382495999336, 0.11797861754894257, -0.0010212818160653114, 0.012419507838785648, 0.06672103703022003, -0.09148582071065903, -0.033776745200157166, -0.05792197957634926, 0.009250137023627758, -0.03712905943393707, 0.013358380645513535, 0.07632025331258774, -0.013612783513963223, 0.060612935572862625, 0.025650320574641228, -0.04788072034716606, 0.104291632771492, -0.018473442643880844, 0.03281310945749283, 0.025609049946069717, -0.004614388570189476, -0.04764921963214874, 0.049185752868652344, 0.036024268716573715, -0.10380559414625168, 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551
553
Swift-UVOT observations of X-ray transient Swift J1753.5-0127
Martin Still (NASA/GSFC), Pete Roming (PSU), Catherine Brocksopp (MSSL) and Craig B. Markwardt (UMD/NASA/GSFC) on behalf of the Swift-UVOT team
The Swift Ultra-Violet/Optical Telescope (UVOT) began settled observations of Swift J1753.5-0127 (Palmer et al; ATel #546) on 2005 July 1 at 21:32:26 UT, 195s after the Swift-BAT trigger. A series of 10-100s exposures in six optical and UV filters were obtained up to 1237s after the trigger. The source position is RA = 17h 53m 28.48s, Dec = -1h 27' 04.3" (J2000), with a 0.5 arcsec uncertainty radius (1-sigma). There is no temporal variability on 10-1000s timescales above a 1-sigma threshold in any filter. Time-averaged instrumental magnitudes and model-folded fluxes are as follows: De-reddened data provide a poor fit to a single black body spectral model. Acceptable fits are found with either a powerlaw model of photon index gamma = 0.4(4) with E(B-V) = 0.42(8), or an accretion disk model of composite black bodies, where the inner disk temperature is limited to T > 116,000 K and E(B-V) = 0.36(2). For comparison, the mapped galactic extinction for the direction of the source yields a colour excess of E(B-V) = 0.45.
2005-07-05 01:17:00
optical,ultra-violet,x-ray,binary,black hole,transient
2005-07-05
01:17:00
1,030
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552
554
Optical photometry of Swift J1753.5-0127
R. I. Hynes (LSU), F. Mullally (UT-Austin)
Rapid optical photometry of Swift J1753.5-0127 (Palmer et al., ATEL #546) was acquired on 2005 July 5th 05:44-07:45UT with the Argos CCD photometer on the McDonald Observatory 2.1m telescope. A broad UBV (BG40) filter was used with 1-sec integrations and negligible dead-time. Weak flickering was present with an rms amplitude 2.0% (integrated 1mHz - 0.5Hz) after subtraction of white-noise power. No QPOs or breaks in the red-noise are apparent within this frequency range. Further fast photometry coordinated with X-ray observations is encouraged as correlated variability is likely.
2005-07-06 06:40:00
optical,x-ray,binary,black hole,transient
2005-07-06
06:40:00
585
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553
555
Correction: UVOT localization of Swift J1753.5-0127
Martin Still
A re-analysis of the current Swift-UVOT data reveals there is no conflict between the source position reported by Halpern (ATel #459). The Swift position is RA = 17h 53m 28.26s, Dec = 01d 27m 06.1s (J2000), 0.3" 1-sigma uncertainty. The previously reported position (ATel #553) contained a manually-generated 3" aspect error.
2005-07-07 00:59:00
optical,ultra-violet,transient,a comment
2005-07-07
00:59:00
325
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554
556
Discovery of SNF20050701-003, a Type II Supernova
The Nearby Supernova Factory: C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
The Nearby Supernova Factory reports the discovery of supernova SNF20050701-003 (coordinates RA 21:40:08.2 DEC +10:39:14.0 J2000.0) in images obtained July 01.5 UT with an approximate magnitude of 19.4 (calibrated to R) using the QUEST II camera on the Palomar Oschin 48-inch telescope as a part of the JPL Near-Earth Asteroid Tracking component of the Palomar Consortium. A spectrum (range 320-1000 nm) of this object, obtained July 05.6 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, shows it to be a Type II supernova at an age of a few weeks past explosion. The spectrum consists of a continuum marked by hydrogen Balmer P-Cygni profiles, as well as P-Cygni He I 587.6 nm. Narrow H-alpha emission from the host suggests a redshift of z = 0.032.
2005-07-07 11:14:00
asteroid,supernovae
2005-07-07
11:14:00
800
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555
557
Outburst Evolution and Pulse Period of 1A 0535+262
D. M. Smith, B. Hazelton, (U. C. Santa Cruz), W. Coburn, S. E. Boggs, M. Fivian, G. J. Hurford, H. S. Hudson (U. C. Berkeley), B. Grefenstette, R. Gilmore (U. C. Santa Cruz)
The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) spacecraft was pointed to the accreting pulsar 1A 0535+262 after the discovery by Tueller et al. (ATEL #504) that it was in a major outburst for the first time since 1994. Operations to point away from the Sun began on 3 June and the pulsar gradually moved into our field of view over the next week (RHESSI repointing is very slow since the spacecraft spins near 15 rpm and has only magnetic torquers to repoint it). The best data were obtained between 11 June and 24 June 2005. The data for several days before this interval may also prove to be useful, but at reduced sensitivity. Comparison with RHESSI observations of the Crab in June 2004 show that 1A 0535+262 had a flux of about 4.5 Crab on 12 June and 2.4 Crab on 23 June, measured at 30 keV. These results, combined with the Swift report (ATEL #504) that the outburst became detectable on May 16 and rose to > 3 Crab before May 31, suggest that this outburst, while probably in decline, is lasting somewhat longer than the last major outburst in 1994, which had a duration (full width at 1/10 peak flux) of about 35 days (Finger, Wilson and Harmon 1996, ApJ 459, 288). Our measured pulse period from 15 June to 24 June was 103.40(2)s, consistent with the value of 103.41s obtained by Mukherjee and Paul (2005, A&A 431, 667) with BeppoSAX in 2001.
2005-07-07 11:39:00
x-ray,binary,neutron star,pulsar,star,the sun,transient
2005-07-07
11:39:00
1,371
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556
558
Swift J1753.5-012: probable radio counterpart
Rob Fender (Southampton), Simon Garrington (Manchester), Tom Muxlow (Manchester)
We report the probable discovery of the radio counterpart to the new X-ray transient Swift J1753.5-0127 (ATEL#546,#547), in observations with the Multi-Element Radio-Linked Interferometer Network (MERLIN). MERLIN (+Lovell telescope) observed for ~8 hours on 2005 July 3, at 1.7 GHz, at the position of the optical counterpart reported by Halpern (ATEL#549). We detect a radio source at RA 17 53 28.29, Dec -01 27 06.22 (J2000, uncertainty of 50 milliarsec), consistent with the optical coordinates of Halpern, and also the revised Swift-UVOT coordinates reported by Still (ATEL#555). The measured flux density is 2.1 +/- 0.2 mJy. Subsequent MERLIN observations on 2005 July 4 and 5 indicate that this radio source is variable, strengthening the likely association with the X-ray transient. The images are consistent with a point source - there is no evidence in these preliminary analyses that the radio source is extended on angular scales greater than 350 milliarcsec.
2005-07-07 21:09:00
radio,optical,x-ray,binary,black hole,neutron star,star,transient,variables
2005-07-07
21:09:00
970
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557
559
Dramactic post-impact X-ray brightening of Comet Tempel 1
Paul O'Brien, Dick Willingale, Stan Cowley (University of Leicester), John Nousek (Penn State University) on behalf of the Swift XRT team
The Swift Gamma-Ray Burst satellite has been monitoring the X-ray emission from Comet Tempel 1 for several weeks using it's X-ray Telescope. The X-ray emission from the Comet was constant within the uncertainties until about 2.9 days after impact. In the following 24 hours the X-ray emission increased by a factor of approximately 7 and has remained bright as of midday (UT) on 2005 July 8. If the cometopause is at a distance of 10000 km from the nucleus, the delay in X-ray brightening implies an average speed for the ejecta of 40 m/s. Further observations are on-going.
2005-07-08 23:58:00
x-ray,gamma ray,comet,gamma-ray burst
2005-07-08
23:58:00
575
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558
560
Discovery of SNF20050705-000 in IC 1439, a Type II Supernova
The Nearby Supernova Factory: N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
The Nearby Supernova Factory reports the discovery of supernova SNF20050705-000 (coordinates RA 22:16:39.6 DEC -21:29:28.7 J2000.0) in IC 1439 in images obtained July 5.4 UT with an approximate magnitude of 18.8 (calibrated to R) using the QUEST II camera on the Palomar Oschin 48-inch telescope as a part of the JPL Near-Earth Asteroid Tracking component of the Palomar Consortium. A spectrum (range 320-1000 nm) of this object, obtained July 8.6 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, shows it to be a Type II supernova approximately one month after explosion. The spectrum is similar to that of the Type IIP SN 1999em at that phase, redshifted to z ~ 0.03 (assuming explosion date 1999 October 27 from Hamuy et al. 2001 ApJ 558, 615) in agreement with the host redshift for IC 1439 at z = 0.0323 from NED.
2005-07-09 04:33:00
optical,asteroid,supernovae
2005-07-09
04:33:00
868
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559
561
Optical observations of SN 2005cs and the possible X-ray Flash in M51
Avishay Gal-Yam (Caltech)
Avishay Gal-Yam (Caltech) reports for the CCCP: Preliminary analysis of the U-band light curve of SN 2005cs in M51 (http://www.astro.caltech.edu/~avishay/sn2005cs-LC-U.png), obtained with the Palomar Observatory robotic 60" telescope+CCD camera in the course of the CCCP, shows a monotonic decline of approximately 0.45 mag between July 1 and July 7. Similar behavior is observed also in R-band. In particular, observations obtained around July 6.28 UT, shortly after the X-ray flash from M51 detected by SWIFT (July 6.231 UT; Immler, Kong, & Lewin, CBET #176) are fully consistent with the trend seen in our U-band data from July 1,2,4 and 7. Preliminary analysis of our R-band data using image subtraction does not reveal any additional variable sources within 20" of the SN.
2005-07-09 05:21:00
optical,x-ray,supernovae,transient,variables
2005-07-09
05:21:00
777
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560
562
Optical/X-ray Variability in Swift 1753.5-0127
R. I. Hynes (LSU), F. Mullally (UT-Austin)
Further rapid optical photometry of Swift J1753.5-0127 (Palmer et al., ATEL #546) was obtained at McDonald Observatory on July 6th and 7th, simultaneously with RXTE public observations. Observational details were exactly as for the previous observation (Hynes & Mullally ATEL #554). Closer examination of the optical power spectrum reveals that the apparent red-noise is actually composed of two components. A high-frequency band-limited noise component is superimposed on a lower-frequency component with a steep flickering power-spectrum. The high-frequency noise correlates fairly well with X-ray variations on both nights, but the low-frequency component is absent in the X-ray data. The high-frequency optical response appears smeared by a few seconds relative to the X-rays consistent with an origin in reprocessing. Further simultaneous observations are urged to exploit this rare echo-mapping opportunity. Time resolutions of a second or better are recommended.
2005-07-11 10:15:00
optical,x-ray,binary,black hole,transient
2005-07-11
10:15:00
969
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561
563
Dramatic radio brightening of Circinus X-1
Rob Fender (Southampton), Tasso Tzioumis (ATNF), Valeriu Tudose (Amsterdam)
We report on observations of the neutron star X-ray binary system and relativistic jet source Circinus X-1 with the Australia Telescope Compact Array (ATCA). A 12hr observation on 2005 June 17 made simultaneously at 4.8 and 8.6 GHz revealed the source to be bright and highly variable, with flux densities at both frequencies varying between 20--50 mJy and flips from optically thick to optically thin spectra. These levels are equal to the largest radio flux densities measured with our (admittedly sporadic) ATCA monitoring program since 1996, and are contrary to the trend of declining radio flux density of both core and extended jets over the period 1998-2001 which was reported in Fender et al. (Nature, 427, 222, 2004). This trend may be traced back to the 1970s, when the radio flares were more than an order of magnitude brighter than they have been since the 1990s. The observations took place within five days of one of the X-ray outbursts from the source, which generally occur with a period of 16.6 days. Preliminary analysis of the radio lightcurves suggest a decline from even higher radio flux levels prior to our observation. It is not clear at present whether this event is related to the secular evolution of Circinus X-1, but if so it may be associated with the near-monotonic fading of the source in X-rays since about 1999, and/or the recent apparent recovery from this decline. The origin of this secular evolution may relate to a varying orbitally-averaged accretion rate and/or precession of the relativistic jet, which seems to be aligned very close to the line of sight. Whatever the origin of the radio rebrightening, it may well have observable consequences in other bands; observations at other wavelenths are therefore strongly encouraged.
2005-07-11 22:00:00
radio,x-ray,binary,neutron star,star,transient,variables,request for observations
2005-07-11
22:00:00
1,770
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562
564
PKS 0537-441: optical monitoring
S. Covino (INAF/OAB), E. Pian (INAF/OATs), A. Treves, A. Dolcini, E. Molinari, G. Chincarini, F. M. Zerbi, M. Rodono', V. Testa, G. Tosti, F. Vitali, L. A. Antonelli, P. Conconi, G. Cutispoto, L. Nicastro, E. Palazzi, E. Meurs, P. Goldoni, on behalf of the REM/ROSS Team
The REM 60cm robotic telescope located at La Silla, Chile, has observed the blazar PKS 0537-441 with the CCD camera and VRI filters on 2005 July 7.35, 9.35, 10.35, 11.35 UT. A steady and achromatic increase in flux by almost 1.5 magnitudes is detected. The amplitude of the variation in such short time scale is remarkable, and if compared to the dramatic variability observed in December 2004 - March 2005 (Dolcini et al., submitted) suggests a long-term active state of the source. We encourage further monitoring from other telescopes.
2005-07-12 18:33:00
optical,agn,blazar,transient,request for observations
2005-07-12
18:33:00
538
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563
565
Further observations of the X-ray flare from Tempel 1
Paul O'Brien, Dick Willingale, Stan Cowley (University of Leicester), John Nousek (Penn State University) on behalf of the Swift XRT team
Observations of comet Tempel 1 with the Swift satellite show that the X-ray emission has now peaked following the observed rise on July 7-8 (ATEL #559). The peak in X-ray emission occurred on July 9, reaching more than an order of magnitude above the quiescent value. The X-ray emission observed on July 12 appears to have returned to its pre-flare value. Hence this X-ray flare lasted about 4 days. Further observations are on-going.
2005-07-12 21:55:00
x-ray,comet
2005-07-12
21:55:00
435
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564
566
Optical and infrared monitoring of SWIFT J1753.3-0127
M. A.P. Torres, D. Steeghs, C. Blake, P. G.Jonker, M. R.Garcia, J. E.McClintock, J. Miller, P. Zhao, M. Calkins, P. Berlind, E. Falco (Harvard-Smithsonian), J. Bloom (UCB), P. Callanan (Univ. Cork), P. Rodriguez-Gil (IAC)
We report preliminary optical/infrared photometry and spectroscopy of the SWIFT J1753.3-0127 transient (ATEL #546, #549) obtained at Fred Whipple Observatory (FLWO), Mt. Hopkins, AZ. Nightly R-band photometry was acquired with the FLWO 1.2m telescope between July 2-11 2005 UT achieving a PSF FWHM of 1.8-2.8 arcsec and typically using 60s exposure times. The images were calibrated using Landolt standard stars. The counterpart showed night to night variability at a level of 0.05-0.1 mag, ranging between 15.6 < R < 15.8 mag during the July 2-11 interval. On top of this variability, a slow decline is suggested at a level of ~0.1 mag per week. Optical spectroscopy was acquired on July 7,10,11,12 2005 UT with the FAST spectrograph attached to the 1.5m telescope, covering 3700-7500 Angstrom with a resolution of <4.5 Angstrom. Broad, double-peaked Halpha emission was detected each night with mean EW of 3 Angstrom, mean double-peak separation of 1200 km/s and FWHM~2000 km/s (see also ATEL #551). HeII4686 emission was highly variable both in terms of strength and profile shape ranging between ~3 and ~5 Angstrom in EW. Near-infrared photometry was acquired using the 1.3m robotic Pairitel telescope on July 11 2005 UT. A point source was detected at the position of the optical counterpart with J=15.1, H=14.8, K=14.3 based on nearby 2MASS sources. No source is present in the 2MASS archive at this position.
2005-07-15 04:05:00
infra-red,optical,binary,black hole,star,transient,variables
2005-07-15
04:05:00
1,418
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565
567
New Outburst of A1744-36 = XTE J1748-361
J. H. Swank (NASA/GSFC) & C. B. Markwardt (Univ. MD and NASA/GSFC)
The transient A1744-36 = XTE J1748-361 is again in outburst. RXTE PCA scans have observed 2-10 keV fluxes of 2.7(0.6), 12.6(0.8),and 23.8(0.4) mCrab on Jul 7.354, Jul 10.941 and Jul 14.04 (UT), respectively. In Novemeber 2003 and in April 2004, PCA scans of the Galactic Bulge saw outbursts from a source consistent with the positions of the discovery observations by Ariel V and the RXTE ASM (Atels # 265, #255, #204). During the April outburst, Steeghs et al. (Atel #267) discovered a bright optical transient coincident with a Chandra X-ray source and a VLA radio source, establishing the likely identity of one X-ray transient. (A second candidate X-ray and radio source had been shown in Atel #210 to be a background AGN.) Radio, optical, and hard X-ray (Atel # 266) counterparts have previously been seen, but additional observations at all wavelengths would be useful to better establish the nature of the source.
2005-07-16 05:24:00
radio,infra-red,optical,x-ray,agn,binary,black hole,neutron star,star,transient,request for observations
2005-07-16
05:24:00
922
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566
568
Type determination of SN 2005cy and SN 2005cx
Avishay Gal-Yam (Caltech) and Keren Sharon (TAU)
Avishay Gal-Yam and Keren Sharon report for the CCCP: We have observed SN 2005cy (Sehgal, Newton and Puckett 2005; CBET #180) with the DBSP spectrograph mounted on the Hale 200" telescope at Palomar Observatory on 2005 July 16.33 UT. A preliminary reduction shows a weak, moderately wide Halpha line superposed on a blue featureless continuum. We therefore conclude that SN 2005cy is likely a young type IIn SN. The redshift we measure from the peak of the Halpha line is consistent with the cataloged redshift of the host galaxy UGC 11241, z~0.036. A similar spectrum of SN 2005cx (Dimai 2005; CBET #179) obtained on July 16.46 UT, shows this is a type Ia SN, similar to SN 1994D, several weeks after explosion.
2005-07-16 20:55:00
optical,supernovae
2005-07-16
20:55:00
712
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567
569
Discovery of a SN in IC 178
F. Manzini (Stazione Astronomica di Sozzago, Italy), A. Dimai (Col Druscié Obs., Cortina, Italy)
Federico Manzini report the discovery by Alessandro Dimai, on behalf of the CROSS Program (cf. IAUC 7373 ) with the 0.5-m "Ullrich" telescope of the Col Druscié observatory (Cortina d'Ampezzo- Italy), of an apparent supernova in IC 178 at a magnitude of 15.5 about; two unfiltered CCD images taken on 2005 July 15.05 (limiting magnitude about 19.0) shown the new object. The presence of the object with magnitude 15.4 about, is confirmed by other two unfiltered CCD images taken on 2005 July 16.01 (limiting magnitude about 18.5) with the same telescope. The new object is located at R.A. = 01h 58m 54.788s; Decl. = +36deg 40m 34.77s (equinox 2000.0), which is 4 arcsec north of the nucleus of IC 178. Other CROSS images of the same field, with limiting magnitude about 18,5, taken on 23th February 2005 and 10th December 2004 showed nothing in the position of the apparent supernova; the object does not appear on Palomar Sky Survey red and blue plates. Other information and images at a page: http://aac.sunrise.it/cross/2005cx.htm
2005-07-16 23:57:00
infra-red,optical,nova,star,supernovae,variables
2005-07-16
23:57:00
1,034
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-0.021678393706679344, 0.034708939492702484, 0.04442959278821945, -0.02654324844479561, 0.010468745604157448, 0.05228177085518837, -0.12865591049194336, -0.00226554274559021, 0.012686011381447315, -0.0391797199845314, 0.0024530489463359118, 0.09019208699464798, -0.04599089175462723, -0.04570040479302406, 0.03608836233615875, -0.02137645147740841, -0.027461513876914978, -0.06749837845563889, 0.03768022730946541, 0.047506652772426605, -0.09481862187385559, -0.12254015356302261, -0.01803952269256115 ]
568
570
Classification of SN2005db, a Type IIn Supernova
The Nearby Supernova Factory: N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
The Nearby Supernova Factory reports that a spectrum (range 320-1000 nm) of SN 2005db (CBET # 182), obtained July 20.6 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-m telescope, shows it to be a Type IIn supernova. Adopting the NED recession velocity of 4534 km/s for the host galaxy, the spectrum is blue and featureless save for narrow emission lines of H-alpha and H-beta of approximately 400 km/s (FWHM). The narrow H-alpha emission line sits on top of a broader component that is approximately 1600 km/s (FWHM).
2005-07-21 06:30:00
optical,supernovae
2005-07-21
06:30:00
552
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569
571
Type Ic SN2005da: Radio Observations
A. M. Soderberg and S. R. Kulkarni (Caltech)
We observed the peculiar Type Ic SN2005da (IAUC 8570 , CBET 186) with the Very Large Array on July 26.2 UT. No radio emission is detected; we place an upper limit of 0.11 mJy at 8.5 GHz. Assuming a distance of 64 Mpc, the radio luminosity of SN2005da is at least 100 times fainter than SN1998bw on a similar timescale yet comparable to the limits for SN2003jd, which also showed broad optical absorption lines at early time. Further observations are planned.
2005-07-27 23:22:00
radio,optical,supernovae
2005-07-27
23:22:00
458
[ -0.04878807067871094, -0.02643475867807865, -0.008967343717813492, 0.05946280434727669, 0.0325525626540184, 0.028615882620215416, -0.016211390495300293, 0.021748114377260208, -0.029828092083334923, -0.03873780369758606, -0.06213821843266487, 0.03483705595135689, -0.0009065347840078175, -0.04433853551745415, -0.03022998385131359, -0.05744194611907005, 0.032237496227025986, -0.13938283920288086, 0.03091161511838436, 0.012481407262384892, 0.02103431336581707, 0.014888178557157516, -0.04114808142185211, 0.022375963628292084, 0.0444197915494442, -0.019085854291915894, 0.053135886788368225, -0.052160605788230896, -0.04487310349941254, 0.0393376387655735, 0.08123123645782471, 0.09629910439252853, -0.06305965781211853, 0.029644789174199104, 0.013458486646413803, -0.052706457674503326, 0.02495969459414482, 0.0764472708106041, 0.026902062818408012, 0.005547381937503815, 0.027843696996569633, -0.06319784373044968, 0.006744386162608862, 0.023452863097190857, 0.0021554934792220592, 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570
572
Chandra and Optical Identification of INTEGRAL Sources
J. P. Halpern (Columbia U.)
Using public Chandra Director's Discretionary Time observations obtained in 2005 June-July of unidentified, high-latitude INTEGRAL sources that were suspected to be obscured AGN (PI: R. Sunyaev), I report their basic properties from the ACIS-I images, and optical counterparts from the Digitized Sky Survey. In each case, the brightest source in the Chandra image is chosen as the likely identification. As was predicted, most (but not all) of these are low-redshift galaxies with hard X-ray counterparts. However, several are also well detected at energies < 2 keV. An R-band image of the galaxy counterpart to IGR J19473+4452 was obtained on the MDM 2.4m telescope in 1.1" seeing on 2005 July 2. It shows a disk galaxy with a bright, slightly resolved bulge. Optical spectra are needed to determine the nature of the activity of all these counterparts. Optical finding charts are linked below. IGR Obs ID Exp Time Chandra Position (J2000) Counts Counts (s) R.A. (h m s), Decl. (° ' ") (0.2-2 keV)(2-10 keV) ---------- J05007-7047 6271341505 00 46.09, -70 44 36.1159482 J07563-4137 6272321607 56 19.62, -41 37 42.2186525 J10252-6829 62733633. . .<26<12 J11085-5100 62743630. . .<17<10 J12026-5349 6275322012 02 47.62, -53 50 07.6118650 J12391-1612* 6276321312 39 06.29, -16 10 47.153280 J13091+1137 6277362713 09 05.60, +11 38 03.03103 J19473+4452 6278359219 47 19.36, +44 49 42.313264 ---------- * Probably XSS J1238.9-1614 (RXTE slew survey, Revnivtsev, M., et al. 2004, A&A, 418, 927 ) CXOU Optical and Other Identification ---------- J050046.0-704436 USNO B1.0 star: B=14.92, R=15.30, I=15.26 J075619.6-413742 IRAS 07545-4129, pair or disturbed galaxy? J120247.6-535007 IRAS 12002-5333 (z=0.0279) J123906.2-161047 LEDA 170194 (z=0.0367) = NVSS J123906.3-161046** J130905.6+113803 NGC 4992 (z=0.0251) J194719.3+444942 2MASX J19471938+4449425 ---------- ** 39.4 mJy @ 21 cm (source correction to Bassani et al. ATEL #537)
2005-08-02 02:34:00
optical,x-ray,gamma ray,agn,star
2005-08-02
02:34:00
1,929
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571
573
Variable star near UGC 11800 is a new cataclysmic variable
D. C. Leonard (California Institute of Technology)
A CCD spectrum (range 340-900 nm), obtained on July 28 UT with the Keck I 10-m telescope (+ LRISp), shows that the variable star reported by Baek & Li (IAUC # 8574 ) near UGC 11800 is a new cataclysmic variable. There are no USNO B1.0 stars detected at the location of the CV. The spectrum is characterized by a blue continuum with strong, broad, absorption Balmer lines evident from H_beta to at least H_eta, with H_beta having an equivalent width of 0.5 nm and FWHM of 5.6 nm; the H_alpha feature is less distinct, as an emission core fills up much of the absorption profile. Broad absorptions due to He I are also detected at 402.6, 447.1, 471.3, and 492.1 nm; the 447.1 nm feature possesses an equivalent width of 0.12 nm. Narrow, unresolved absorptions due to Ca II K and Na I D, with equivalent widths of 0.015 and 0.18 nm, respectively, are evident; these are likely interstellar in origin (a reddening of E(B-V) = 0.31 mag is reported by Schlegel, Finkbeiner and Davis (1998, Ap.J. 500, 525) for the entire dust column through the Galaxy).
2005-08-06 03:47:00
optical,cataclysmic variable,star,variables
2005-08-06
03:47:00
1,047
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572
574
INTEGRAL High-Energy Detection of SWIFT J1753.5-0127
M. Cadolle Bel (APC & SAp, CEA-Saclay, France), J. Rodriguez (AIM & SAp, CEA-Saclay, France), A. Goldwurm (APC & SAp, CEA-Saclay, France), P. Goldoni (APC & SAp, CEA-Saclay, France), P. Laurent (APC & SAp, CEA-Saclay, France), P. Ubertini (IASF/CNR Roma, Italy), S. Mereghetti (IFCTR/CNR Milano, Italy)
We report preliminary analysis of the first part of the INTEGRAL ToO observations of the transient SWIFT source J1753.5-0127 (ATEL # 546) from 2005-08-10 12:29:51.0 (U.T.C.) until 2005-08-12 15:31:07.0. A look at the first 50 ks of IBIS/ISGRI data gives us the following values: 230 sigma (~170 mCrab), 157 sigma (~190 mCrab) and 87 sigma (~250 mCrab) respectively in the 20-40, 40-80 and 80-200 energy bands. In the 200-500 keV energy band, the source is marginally detected in the quick look data. The spectrum seems to be harder than the Crab one, which is typical of Black Hole candidate in the Hard State (see also ATEL #550). The lightcurves show some variations between 135-180 mCrab in the 20-40 keV energy range and 170-200 mCrab in the 40-80 keV band.
2005-08-11 21:57:00
x-ray,gamma ray,binary,black hole,transient
2005-08-11
21:57:00
761
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573
575
H1743-322 re-appears
M. P. Rupen (NRAO/GSFC), A. J. Mioduszewski, V. Dhawan (NRAO)
Very Large Array (VLA) observations of the black hole candidate binary H1743-322 = IGR J1746-3213 = XTE J17464-3213 (e.g., ATel #301, #314) show that the central radio source has re-appeared. Data taken on August 7, 2005 (MJD 53589.25) at 4.86 GHz gave a clear detection with a flux density of 0.59 +/- 0.07 mJy; data taken at the same frequency on June 11 (MJD 53532.30) gave only an upper limit, with a nominal flux density at the source position of 0.03 +/- 0.04 mJy/beam. Further VLA observations are planned -- see The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
2005-08-12 00:57:00
radio,infra-red,optical,x-ray,binary,black hole,transient
2005-08-12
00:57:00
680
[ -0.01126161403954029, -0.00601767934858799, -0.08126889169216156, 0.08091679960489273, 0.03690289705991745, -0.06829486787319183, -0.03517796844244003, -0.023500259965658188, -0.004817215725779533, -0.06326045095920563, -0.053790342062711716, -0.02142888307571411, -0.014827609062194824, -0.019942475482821465, -0.04498248174786568, -0.025021737441420555, 0.10521330684423447, -0.0980013757944107, 0.029291803017258644, -0.023178039118647575, -0.05496576055884361, 0.11231391131877899, -0.010139061138033867, 0.022935159504413605, 0.05865766108036041, -0.024016784504055977, -0.016607724130153656, -0.07407263666391373, -0.025048432871699333, -0.04468298703432083, -0.035193875432014465, 0.07532195746898651, 0.0069897850044071674, 0.008860809728503227, 0.052357569336891174, 0.004109641537070274, -0.01387268491089344, -0.011152833700180054, -0.009487219154834747, 0.01242936123162508, -0.0071572186425328255, -0.02309817634522915, 0.024039076641201973, 0.02822001650929451, -0.08443991839885712, 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574
576
H1743-322 X-ray Rise
J. H. Swank (NASA/GSFC), R. Remillard(MIT) & C. B. Markwardt (Univ. MD and NASA/GSFC)
RXTE observations show that H1743-322 = IGR J1746-3213 = XTE J17464-3213 is again active in X-rays as well as radio (see Atel #575). The source was below the ASM 3-sigma day average sensitivity limit on Aug 5, but on Aug 6 the ASM saw a day average of 21(8)mCrab. A PCA scan on Aug 7, 13:20 UTC confirmed that the source was on, detecting 27.4(1.2) mCrab, 2-10 keV. On Aug 10, at 10:36 UTC, the PCA found that the source had risen to 57.0(1.8) mcrab. On Aug 11, the ASM day average was 64(7) mCrab. The rate of rise over 4 days was half those of the outbursts in July 2004 and March 2003. Further RXTE observations are being planned.
2005-08-12 04:41:00
radio,x-ray,black hole,transient
2005-08-12
04:41:00
633
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575
577
Optical/IR observations of H1743-322
C. Bailyn, A. Cantrell, B. Cobb, M. Buxton (Yale)
We obtained a 30m exposure in I and K of H1743-322, using the SMARTS consortium 1.3m and ANDICAM instrument at Cerro Tololo Interamerican Observatory, beginning at UT 00:36 August 12, 2005. We see no evidence for a rise in either band, to limits of I~22 and K~15. These limits are ~1.5 magnitudes fainter than was observed in April 2003 near the peak of the last outburst. Further observations to this depth are planned.
2005-08-13 03:11:00
infra-red,optical,binary,black hole,transient
2005-08-13
03:11:00
420
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576
578
New X-ray Transient, XTE J1818-254
A. M. Levine (MIT), J. H. Swank (GSFC), D. Lin (MIT), and R. A. Remillard (MIT), for the ASM team at MIT and NASA/GSFC
Observations with the RXTE All-Sky Monitor reveal X-ray emission from a new transient at coordinates 274.60, -24.53 (degrees, J2000), with a position uncertainty of 0.10 degrees at 90% confidence. The source was first detected on 2005 August 12, with an average flux of 55 (5) mCrab at 2-12 keV. By 2005 August 14 the flux had increased to 510 (9), with a similar flux of 470 (13) mCrab on August 15. The ASM hardness ratio (5-12 keV to 3-5 keV) indicates a very soft spectrum, suggesting a black-hole binary with a thermal-type spectrum. Observations at other wavelengths are needed as soon as possible.
2005-08-16 13:11:00
x-ray,binary,transient
2005-08-16
13:11:00
604
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577
579
RXTE PCA Position for XTE J1818-245
C. B. Markwardt (GSFC/UMD), T. E. Strohmayer (GSFC), J. H. Swank (GSFC), A. M. Levine (MIT)
RXTE observed the position of XTE J1818-245 (ATEL #578) on Aug 16, 04:19 to 05:15 UT. The observation included both pointed data and a cross scan for position. We note the corrected source name. The best fit position is R.A., Dec. = 274.605, -24.542 deg (J2000), with an estimated systematic position uncertainty of ~1 arcmin. This position is approximately 50 arcsec from the ASM position reported in ATEL #578 by Levine et al. The spectrum is reasonably well fit by a strong soft thermal component (kT ~ 0.5 keV) plus a steep power law (gamma ~2.6), and a feature near 6.4 keV. The X-ray fluxes in the 2-10, 10-20 and 20-40 keV bands are 77, 1.7 and 1.4 times 1E-10 erg cmE-2 sE-1. No pulsations are detected. As noted by Levine et al (ATEL #578), these behaviors are suggestive of a black hole transient.
2005-08-17 01:28:00
x-ray,binary,black hole,transient
2005-08-17
01:28:00
810
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578
580
ASM transient, XTE J1818-245
A. M. Levine (MIT), J. H. Swank (GSFC), D. Lin (MIT), and R. A. Remillard (MIT), for the ASM team at MIT and NASA/GSFC
We correct the error in Atel #578 regarding the name of the new X-ray transient, which should be known as 'XTE J1818-245'. The ASM position for the source was correctly reported.
2005-08-17 01:46:00
x-ray,transient
2005-08-17
01:46:00
178
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579
581
Type Determination for SNe 2005dh and 2005di
A. Gal-Yam, D. Sand and D. Leonard (Caltech)
A. Gal-Yam, D. Sand and D. Leonard report for the CCCP: We have observed SN 2005dh (Moore &Li ; IAUC # 8583 ) and SN 2005di (Pugh & Li; CBET #198) with the DBSP spectrograph mounted on the Hale 200" telescope at Palomar Observatory on 2005 August 14 UT. Reductions of the red-side spectra confirm that SN 2005dh is indeed of type Ia, with Si II (rest 635.5 nm) absorption indicating an expansion velocity v~16,000 km/s. If the object is indeed near maximum light, as reported by Salvo et al. (CBET #199), then this velocity is unusually high. The spectrum of SN 2005di is quite similar, also indicating this is a young SN Ia, with an expansion velocity of v~13,000 km/s, correcting for the galaxy redshift of z=0.025 (measured from narrow Balmer lines in the galaxy spectrum, and consistent with the cataloged value in NED).
2005-08-17 05:50:00
optical,supernovae
2005-08-17
05:50:00
824
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580
582
Discovery of Supernova SNF20050803-005
The Nearby Supernova Factory: P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
The Nearby Supernova Factory reports the discovery of SNF20050803-005 (coordinates RA=00:09:34.7, DEC=+12:45:21.4 J2000.0) in an image obtained Aug 8.5 UT with the QUEST II camera on the Palomar Oschin 48-inch telescope as a part of the JPL Near-Earth Asteroid Tracking component of the Palomar-QUEST survey. The supernova had an unfiltered magnitude of 19.7 at discovery and was confirmed photometrically on Aug 11.5 UT with the Lick 1-m Nickel Reflector.
2005-08-17 13:57:00
optical,asteroid,supernovae
2005-08-17
13:57:00
456
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-0.0074159218929708, 0.04225921630859375, -0.03647887706756592, 0.025052396580576897, 0.0018871966749429703, -0.02225220762193203, 0.005049610510468483, 0.0694669708609581, 0.00462475698441267, 0.03771955892443657, -0.02884257212281227, -0.051677532494068146, -0.04141901433467865, -0.006605953443795443, -0.10132976621389389, -0.014533923007547855, -0.001010861829854548, -0.008592209778726101, 0.0887954831123352, -0.06019879877567291, -0.08407072722911835, 0.016149142757058144 ]
581
583
INTEGRAL observations of XTE J1818-245
S. E. Shaw (Southampton, UK / ISDC, Geneva); E. Kuulkers (ESA/ESAC, Spain); M. Turler, N. Mowlavi, T. Courvoisier (ISDC, Geneva); C. Markwardt (NASA/GSFC, USA); T. Oosterbroek, A. Orr (ESA/ESTEC, Netherlands); A. Paizis (ISDC, Geneva / IASF, Milano); K. Ebisawa (NASA/GSFC, USA); P. Kretschmar (ESA/ESAC, Spain); R. Wijnands (UvA, Netherlands)
The IBIS/ISGRI instrument aboard INTEGRAL has observed the transient black hole candidate XTE J1818-245 (ATel #578) during seven 1800 second exposures of the Galactic Bulge region between UTC 2005-08-16 23:57 and 2005-08-17 03:39. The position from the 20-60 keV ISGRI mosaic image is determined as (RA, dec.) = (274.60, -24.53) ± 0.03 degrees. The IBIS/ISGRI position is the same as the ASM position given in ATel #578 and 50 arcseconds from the PCA position quoted in ATel #579. The source appeared stable over the 7 pointings, with an average flux of 4 cps ( ~ 25 mCrab) and 0.7 cps (~ 17 mCrab) in the 20-60 and 60-150 keV bands, respectively. The source was not in the field of view of the JEM-X instrument during any of the observations. An average spectrum from 20-100 keV was produced for the source; the spectrum could be fitted with a single power law with photon index = 2.7 ± 0.3, comparable to the value in ATel #579. The integrated 20-40 and 40-80 keV fluxes are 3.0E-10 and 1.8E-10 ergs/cm^2/s, which suggests that the source may have brightened by about a factor of three in 24 hours (ATel #579). XTE J1818-245 will continue to be observed with INTEGRAL, as part of the Galactic Bulge monitoring programme, approximately every three days for the following 3 months. Quick-look light curves and mosaic images are available to the public from: http://isdc.unige.ch/Science/BULGE/
2005-08-18 00:02:00
x-ray,gamma ray,black hole,transient
2005-08-18
00:02:00
1,400
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582
584
Type Determination for supernova SNF20050803-005
A. Gal-Yam, D. Sand and D. Leonard (Caltech)
A. Gal-Yam, D. Sand and D. Leonard report for the CCCP: We have observed SNF20050803-005 (The nearby SN factory; ATEL #582) with the DBSP spectrograph mounted on the Hale 200" telescope at Palomar Observatory on 2005 August 14 UT. Reductions of the red-side spectra show a prominent Halpha line with a well-developed P-cygni profile, indicating this is a type II SN. From narrow Balmer lines in the spectrum of the anonymous host galaxy we determine a redshift of z=0.0387 for this event.
2005-08-18 01:45:00
optical,supernovae
2005-08-18
01:45:00
488
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583
585
Optical counterpart candidate to XTE J1818-245
D. Steeghs, M. A.P. Torres (CfA), W. Pych (CAMK, Warsaw), I. Thompson (Carnegie)
We report on the likely optical counterpart to the X-ray transient XTE J1818-245 (ATEL #578,#579). Photometry was acquired with the Swope 1.0m telescope (Las Campanas Observatory, Chile) during August 17 2005 23:19 UT - August 18 2005 00:18 UT. Our observations consist of several 60/180s exposures in the R and V bands acquired with an image quality of 1.3 arcsec. Comparison of our images with the Digitized Sky Survey and 2MASS reveals the presence of a single new point-like object within the error circle for the RXTE PCA X-ray position reported in ATEL #579. The coordinates for this optical source are R.A(J2000): 18:18:24.4, Dec(J2000): -24:32:18.0 based on astrometry relative to the 2MASS frame (estimated uncertainty 0.3 arcsec). A comparison with nearby USNO stars suggests a magnitude near R=17.5. We tentatively identify this object as the optical counterpart to XTE J1818-245. Follow-up photometric observations and the acquisition of a spectrum to confirm the optical counterpart are encouraged. A finding chart for the candidate may be found at: http:/hea-www.cfa.harvard.edu/~dsteeghs/Images/XTEJ1818-245.jpg
2005-08-18 11:25:00
optical,x-ray,binary,black hole,star,transient
2005-08-18
11:25:00
1,130
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-0.03901918977499008, -0.055293597280979156, 0.030715202912688255, 0.0578630305826664, -0.034169502556324005, 0.06431504338979721, 0.003493534168228507, -0.06668229401111603, -0.04423050954937935, -0.09541820734739304, -0.04496772214770317, 0.037863604724407196, 0.01688680425286293, -0.09458316117525101, -0.05707240104675293, 0.007476415019482374, 0.028916960582137108, -0.049581289291381836, -0.0036376542411744595, 0.030505800619721413, 0.044056352227926254, -0.07753428816795349, -0.10912607610225677, -0.02726115472614765 ]
584
586
SNe 1999dd and 1999de are AGN
Avishay Gal-Yam (Caltech)
I have obtained a spectrum of the host galaxy of SN 1999dd (Gal-Yam & Maoz 1999; IAUC # 7227 ) with the LRIS spectrograph mounted on the Keck I 10m telescope at WMKO, Hawaii, on UT August 1, 2005. Full reduction reveals the galaxy is a type I AGN at z=1.064, derived from broad Mg II 2800 and confirmed by narrow OII 3727. I therefore conclude the optical variability originally attributed to a SN is more likely to have been an AGN flare, and that SN 1999dd is likely not a SN at all. I have also observed the location of SN 1999de (Gal-Yam & Maoz, IAUC # 7227 ) using the same setup. The target acquisition image showed a source at the location of SN 1999de has re-emerged. I have obtained spectra of this source, as well as of the nearby galaxy originally assumed to have been the host of SN 1999de. I find that the variable source is another type I AGN at z=0.65, based on a broad Mg II 2800 line and confirmed by a narrow NeV 3346 line. The nearby galaxy is at z=0.384 based on narrow lines of OIII 5007, Hbeta 4861 and OII 3727. I therefore conclude that the source reported as SN 1999de is actually a variable AGN, projected near a lower redshift galaxy, and both objects are behind and unrelated to the cluster Abell 24 which lies in the foreground. I note that these observations now make the sample of SNe discovered by the Wise Observatory Optical Transients Survey (WOOTS; e.g., Gal-Yam et al. 2003, AJ, 125, 1087) complete in the sense that every object reported by WOOTS has either been spectroscopically confirmed or is not a SN.
2005-08-20 05:23:00
optical,agn,supernovae,transient,variables
2005-08-20
05:23:00
1,544
[ -0.11209255456924438, -0.09068752825260162, 0.02404891699552536, 0.027780156582593918, 0.05764131247997284, 0.002648173365741968, 0.03573811054229736, 0.04825010150671005, 0.0031698348466306925, -0.006363232154399157, 0.03571120277047157, 0.01649029739201069, 0.00342094199731946, -0.03132767975330353, -0.021554745733737946, -0.005732719320803881, 0.03918585926294327, -0.09584084898233414, 0.037247009575366974, 0.060373757034540176, 0.011623664759099483, 0.062131498008966446, -0.031865861266851425, 0.04843096807599068, 0.06982510536909103, -0.090332992374897, 0.014347636140882969, 0.05999203398823738, 0.013527465052902699, -0.05704208090901375, 0.11536403000354767, 0.10419020801782608, 0.0004399750614538789, 0.0820375606417656, 0.030827268958091736, -0.07746773958206177, 0.049676429480314255, -0.036324191838502884, 0.05514870956540108, -0.027037572115659714, 0.051707543432712555, -0.03419844061136246, 0.09189220517873764, -0.09212251007556915, 0.014583305455744267, 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585
587
Classification of SN2005dj, a Type II Supernova
The Nearby Supernova Factory: N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), G. Aldering, S. Bailey, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
The Nearby Supernova Factory reports that a spectrum (range 320-1000 nm) of SN 2005dj (IAUC# 8585 ), obtained August 19.6 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, reveals P-Cygni H-alpha and H-beta, indicative of a Type II supernova. The observed redshift is consistent with that of the host UGC 3545 (z = 0.011508, Huchtmeier & Skillman 1998 via NED). Using this value, we measure absorption the minima of these two features at 8000 km/s.
2005-08-20 05:45:00
supernovae
2005-08-20
05:45:00
497
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586
588
Swift localization of XTE J1818-245
M. Still N. Gehrels (NASA/GSFC), D. Steeghs, M. A.P. Torres (CfA), O. Godet (U. Leicester), C. Brocksopp (MSSL)
The Swift observatory pointed at the X-ray transient XTE J1818-245 on 2005-08-20 between 06:18:52-06:21:02 UT. The X-ray source discovered by Levine et al. (ATel #578), is still bright. Despite pileup in the PC detector mode (count rate = 72 c/s), the XRT localizes the source to within 7" (90% containment) of RA = 18h 18m 24.8s, Dec = -24d 32' 15" (J2000). The optical counterpart identified by Steeghs et al. (ATel #585) lies within the XRT error circle. A 134s UVOT observation was also performed through the UVW2 filter with a central wavelength of 1800 Angstroms. There is no source contained within the XRT error circle down to a 17.7 mag 5-sigma limit. UVOT magnitudes are based on Vega.
2005-08-21 01:23:00
optical,ultra-violet,x-ray,black hole,transient
2005-08-21
01:23:00
695
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-0.07990089058876038, -0.0406038798391819, 0.03790049999952316, 0.06997671723365784, -0.004337675869464874, 0.038860976696014404, 0.010874142870306969, -0.03156773000955582, -0.04706735536456108, -0.05204303562641144, 0.009826172143220901, -0.004836489912122488, 0.02014962024986744, -0.06903674453496933, -0.03453287109732628, 0.009432605467736721, 0.019421329721808434, -0.08447523415088654, -0.0651247501373291, 0.018389897421002388, 0.0179878119379282, -0.12858010828495026, -0.011333314701914787, -0.03254474699497223 ]
587
589
Onset of radio emission in XTE J1818-245
M. P. Rupen, V. Dhawan, and A. J. Mioduszewski (National Radio Astronomy Observatory)
We detect XTE J1818-245 at 6cm with the VLA, at the optical position reported by Steeghs et al. in ATEL #585 . The source is unresolved by the beam of 7" by 3.3" at PA 8 degrees. The flux densities were 7.1 (0.14) mJy on Aug.20, UT 02:10-02:20. 27.3 (0.55) mJy on Aug.21, UT 04:22-04:45. at 18:18:24.43 (0.2") - 24:32:17.96 (0.4") J2000.
2005-08-22 05:51:00
radio,optical,x-ray
2005-08-22
05:51:00
340
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588
590
INTEGRAL serendipitous hard X-ray detection of the millisecond pulsar HETE J1900.1-2455
P. Goldoni (APC & SAp/CEA-Saclay, France), S. Soldi (ISDC, Geneva), S. E. Shaw (Southampton UK/ISDC, Geneva), M. Cadolle Bel (APC & SAp/CEA-Saclay, France), P. Laurent (APC & SAp/CEA-Saclay, France), M. Falanga (APC & SAp/CEA-Saclay, France), A. Goldwurm (APC & SAp/CEA-Saclay, France), P. Ubertini (INAF/IASF Rome Italy)
We report the serendipitous detection with the IBIS/ISGRI detector of the millisecond pulsar HETE J1900.1-2455 (ATEL #516) during the INTEGRAL ToO observations of XTE J1818-245 in the Galactic Center Region from 2005-08-20 10:00:00 (UTC) until 2005-08-21 06:38:23 (UTC). HETE J1900.1-2455 was at a distance between 7 and 14 degrees from the pointing direction and it is clearly detected in the 20-40 and 40-80 keV energy bands with significance levels of 26 and 13 sigma, respectively. This correspond to a source flux of ~37 mCrab (20-40 keV) and ~32 mCrab (40-80 keV). We remark that the source is stronger than previously reported (ATEL #525), which supports a new period of activity after the June 2005 outburst unlike what has been observed in the other accreting millisecond pulsars. This renewed activity has also been suggested by the recent Swift detection on August 17 2005 of a soft burst from HETE J1900.1-2455 (Barbier et al., GCN 3824).
2005-08-23 16:10:00
x-ray,gamma ray,pulsar,request for observations
2005-08-23
16:10:00
950
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589
591
Swift confirms identification of RT Cru as the IGR J12349-6434 hard x-ray source
J. Tueller, N. Gehrels, R. F. Mushotzky,(GSFC/NASA), C. B. Markwardt (UMD/NASA), J. A. Kennea, D. N. Burrows(PSU), K. Mukai,(USRA/NASA), J. Sokoloski (Harvard CFA)
The hard x-ray source, IGR J12349-6434 and SWIFT J1234.7-6433 (BAT survey source), has been detected by Swift XRT. There is only one bright x-ray source in the BAT error circle, with an absorbed flux of 3 x 10^11 erg/cm^2/s (0.5-10 keV). The XRT position is R.A.=12h34m54.7s , Decl.=-64d33m55.6s The XRT position is 5" from the symbiotic star RT Cru within the 6" XRT error radius, confirming the suggested identification of N. Masetti et al. ATel # 528.
2005-08-25 01:46:00
x-ray,binary,star,variables
2005-08-25
01:46:00
454
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590
592
INTEGRAL detects XTE J1739-285
A. Bodghee, N. Mowlavi (ISDC, Geneva); E. Kuulkers (ESA/ESAC, Spain); R. Wijnands (UvA, Netherlands); S. E. Shaw (Southampton, UK / ISDC, Geneva); T. Courvoisier (ISDC, Geneva); C. Markwardt (NASA/GSFC, USA); T. Oosterbroek, A. Orr (ESA/ESTEC, Netherlands); A. Paizis (ISDC, Geneva / IASF, Milano); K. Ebisawa (NASA/GSFC, USA); P. Kretschmar (ESA/ESAC, Spain)
The JEM-X telescope on board INTEGRAL detected the X-ray transient XTE J1739-285 while monitoring the Galactic Bulge in revolution 350. The source was detected in three successive pointings of 30 minutes each, starting on 2005-08-25T14:40 UTC. The fluxes in the 3-10 keV band were about 120, 70 and 77 mCrabs, respectively, and about 70, 30 and 40 mCrabs in the 10-20 keV band. The source was not detected above 20 keV by the ISGRI instrument, with an upper limit of 5 mCrabs. The source position (J2000) derived by JEM-X is R.A.=17 40.0 and Dec.=-28 30 (2' accuracy), which is within the 5' accuracy of the position derived by RXTE in 1999 (IAUC 7300 ). The spectrum can be modeled with a power law with a photon index of 2.9+/-0.1, yielding a flux of 1.8e-9 ergs/cm2/s in the 2-10 keV band. Follow-up observations at other wavelengths are encouraged.
2005-08-27 00:52:00
x-ray,transient
2005-08-27
00:52:00
852
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591
593
Brightening of H1743-322 and the Rapid Burster
P. Kretschmar (ESA/ESAC, Spain); S. E. Shaw (Southampton, UK / ISDC, Geneva); E. Kuulkers (ESA/ESAC, Spain); R. Wijnands (UvA, Netherlands); M. Turler, N. Mowlavi, T. Courvoisier (ISDC, Geneva); C. Markwardt (NASA/GSFC, USA); T. Oosterbroek, A. Orr (ESA/ESTEC, Netherlands); A. Paizis (ISDC, Geneva / IASF, Milano); K. Ebisawa (NASA/GSFC, USA)
Observations done on Aug 17 and 21, 2005 as part of the INTEGRAL Galactic Bulge monitoring campaign show further brightening of H1743-322 (ATel #575,#576) and an outburst of the rapid burster (4U 1730-335). For H1743-322 the averaged spectrum is well fitted by a single powerlaw with a slope of 2.58+-0.08 in the range from 5-200 keV. Fluxes are 136+4-9 mCrab (5-20 keV) and 66+2-4 mCrab (20-100 keV) with 90% errors given. The Rapid Burster is detected at a strength of 11+-2 mCrab in the ISGRI 20-60 keV data. RXTE PCA scans of the region show that the Rapid Burster has been active since Aug 16, with a peak flux (~100 mCrab, 2-10 keV) typical of one of its outbursts. Quick-look light curves and mosaic images from the monitoring program are available to the public from the link below.
2005-08-27 01:47:00
x-ray,gamma ray,black hole,neutron star,star,transient
2005-08-27
01:47:00
793
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592
594
Observations of an apparent SN in NGC 2276
F. Manzini (Stazione Astronomica di Sozzago, Italy), A. Dimai & M. Migliardi (Col Druscié Obs., Cortina, Italy)
Federico Manzini (SAS obs., IAUC A12) report the observation by Alessandro Dimai, Cortina (Italy), and Marco Migliardi, Tour Tour (France), of an apparent SN in NGC 2276 (m. = +17.1), on four unfiltered CCD images taken on 2005 august 25.1 (lim. magn. about +19,5) with the 0.5-m "Ullrich" telescope of the Col Druscié observatory (Cortina d'Ampezzo, Italy). The observation is confirmed by other three unfiltered CCD images, taken on 2005 august 26.13 (m = +16.8 and limiting magnitude about +19.8), with the same telescope on behalf of the CROSS (Col drusciè Remote Observatory Supernovae Search) program (cf. IAUC 7373 ). The apparent SN is located at R.A. = 07h 27m 31.75s; Decl. = +85deg 45m 15.0s (2000.0), which is 18 sec E and 1 sec S of the nucleus of NGC 2276. A CROSS image of the same field taken on 2005 may 19th (limiting mag about 18,5) and an image taken on 2005 february 17th (lim. magn. about 19,0) by F. Manzini (SAS obs., 0,4m telescope) with the same CCD sensor, showed nothing in the position of the object. It does not appear on Palomar Sky Survey red, IR and blue plates.
2005-08-27 02:42:00
infra-red,optical,star,supernovae,request for observations
2005-08-27
02:42:00
1,097
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593
595
Renewed Activity from A 0535+26
Mark H. Finger (National Space Science and Technology Center/USRA)
A short observation of A 0535+26 on August 26.7 with the RXTE/PCA shows this nearby Be/X-ray pulsar at a flux of approximately 20 mCrab (2-10 keV). Pulsations consistent with a period of ~103 s were present, as was a high level of aperiodic variability. The source had a major outburst in May and June 2005 which, because of the closeness of the sun, was observed by only a few instruments (ATEL #504, ATEL #557). In the RXTE/ASM light-curve A0535+26 was detected from May 6th to June 24, and had a peak flux above 103 c/s (1.4 Crab). A PCA observation on July 27.0 found a flux of about 2 mCrab (2-10 keV). The recent PCA detection is approximately one orbital period (111 days, Motch et al. 1991, ApJ 369, 490) after the June 24 ASM detection. Another major outburst is possible. Further observations are scheduled with RXTE, and observations with other instruments are encouraged.
2005-08-28 03:58:00
x-ray,binary,neutron star,pulsar,star,the sun,transient
2005-08-28
03:58:00
883
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594
596
Classification of SN 2005dm, a SN 1991bg-like Type Ia Supernova
The Nearby Supernova Factory: G. Aldering, S. Bailey, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), P. Antilogus, G. Garavini, S. Gilles, R. Pain (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
The Nearby Supernova Factory reports that a spectrum (range 320-1000 nm) of SN 2005dm (CBET #203), obtained Aug 27.6 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, shows it to be a peculiar Type Ia supernova around maximum light. The spectrum is similar to that of the underluminous SN 1991bg, exhibiting a classic Ti II trough at 400-450 nm.
2005-08-29 06:56:00
optical,supernovae
2005-08-29
06:56:00
394
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-0.0121538657695055, 0.03652019426226616, -0.027610016986727715, -0.002168921986594796, -0.02770109288394451, -0.022325431928038597, 0.01852673850953579, 0.07509783655405045, -0.01604747213423252, 0.013816113583743572, -0.04285891726613045, -0.06910495460033417, -0.068393774330616, -0.031701020896434784, -0.09307637065649033, -0.018268287181854248, -0.05005889758467674, -0.04038766026496887, 0.1141265481710434, -0.08683545887470245, -0.04576229676604271, 0.03000888228416443 ]
595
597
A 0535+26 Flux Rising
Mark H. Finger (National Space Science and Technology Center/USRA)
Observations of A 0535+26 on August 28 with the RXTE/PCA show a rapid rise in flux since the sources 20 mCrab detection on August 26 (ATEL #595). An observation with mid-time of 2:15 UT had a mean flux of 90 mCrab, while three observations between 14:20 and 18:10 UT had mean fluxes of 430, 220, and 260 mCrab. These fluxes are based on the standard 1 rates (2-60 keV).
2005-08-29 07:03:00
x-ray,binary,pulsar,transient
2005-08-29
07:03:00
369
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596
598
Correction: Rapid Burster = MXB 1730-335
P. Kretschmar (ESA/ESAC, Spain); S. E. Shaw (Southampton, UK / ISDC, Geneva); E. Kuulkers (ESA/ESAC, Spain); R. Wijnands (UvA, Netherlands); M. Turler, N. Mowlavi, T. Courvoisier (ISDC, Geneva); C. Markwardt (NASA/GSFC, USA); T. Oosterbroek, A. Orr (ESA/ESTEC, Netherlands); A. Paizis (ISDC, Geneva / IASF, Milano); K. Ebisawa (NASA/GSFC, USA)
In ATel #593, the Rapid Burster was also labeled 4U 1730-335, an identifier found in the SIMBAD database. Walter H.G. Lewin has brought to our attention that this is a misnomer, since the Rapid Burster is not included in the 4th Uhuru catalog. The correct name is MXB 1730-335.
2005-08-30 20:56:00
x-ray,gamma ray,neutron star,star
2005-08-30
20:56:00
277
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597
599
Swift Detection of Flaring X-ray Activity from IGR J16479-4514
J. A. Kennea (PSU), C. Pagani (INAF-OAB/PSU), C. Markwardt (UMD/GSFC), A. Blustin (UCL-MSSL), J. Cummings (GSFC/NRC), J. Nousek (PSU), N. Gehrels (GSFC).
On August 30th at 04:08:48 UT, the Swift Burst Alert Telescope (BAT) triggered on a source near the location of IGR J16479-4514 (ATEL #176). The Swift spacecraft promptly slewed to this position and the Swift X-ray Telescope (XRT) began observations of the field at 04:10:56 UT. A bright variable X-ray source was found in the field at the following position: RA(J2000): 16:48:07.0, Dec(J2000): -45:12:05.8, with an estimated error radius of 6 arcseconds (90% containment). This position is 1.7 arcminutes from the position of IGR J16479-4514 reported by Bird et al. (2004), and 3 arcminutes from the position reported in ATEL #172. We have performed a preliminary analysis of archival XMM-Newton data from March 21st, 2004 and have found an X-ray source at a position consistent with the Swift/XRT position above. We can therefore rule out the possibility that this source is a new transient or GRB event, and is most likely the X-ray counterpart to IGR J16479-4514. During the Swift observations of this source it displayed considerable variability. The flare in the BAT light curve lasted ~400 seconds in the 15-50 keV band. There was no significant emission above 50 keV. The XRT light-curve, which covers ~30ks (7.2ks exposure) shows 2 long bright flares: The first is ongoing when the XRT started taking data, and presumably is the tail end of the peak that caused the BAT trigger; The second starts approximately 4000s after the observation began, and lasts approximately 1000s. The overall light-curve appears to be decaying. The spectrum of the source is well fit by an absorbed power-law, with N_H = 6.4 +/- 0.9 x 10^22 cm^-2 and a photon index of 1.09 +/- 0.25. The mean flux in the 0.5-10 keV range is 3.8 x 10^-11 erg/s/cm^2, not corrected for absorption. This mean flux is approximately 10 times brighter than the mean flux seen in the archival XMM-Newton data for this source. The Swift UV/Optical Telescope (UVOT) detects a faint source within 3 arcseconds of the XRT position: RA(J2000): 16:48:06.8, Dec(J2000): -45:12:08.0. It is visible only in the V-band at a magnitude of 20.4 +/- 0.4 (in a co-added image with a total of 1068 s of exposure time), and appears to be present at a low significance in the DSS. Currently there are not enough data from the UVOT to determine if this possible optical counterpart is varying. Follow-up observations of this source are planned with Swift.
2005-08-31 05:23:00
optical,x-ray,transient,variables
2005-08-31
05:23:00
2,407
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M31 optical transient
R. Quimby, P. Mondol, P. Hoeflich, J. C. Wheeler (University of Texas), and C. Gerardy (Imperial College)
We report the discovery of a transient near M31 using unfiltered CCD images taken on September 1.23 UT (about 18.0 mag) and September 2.23 (about 16.5 mag) using the 0.45m ROTSE-IIIb telescope at the McDonald Observatory. The object is located at RA = 00h38m49.52s DEC = +40o19'54.1" (J2000) and was not detected in ROTSE-IIIb data from August 31.23 UT (limiting mag about 18.7). A finding chart for the transient can be found at: http://grad40.as.utexas.edu/~quimby/tss/nova5.png
2005-09-03 02:39:00
optical,cataclysmic variable,nova,supernovae,transient,variables
2005-09-03
02:39:00
480
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599