//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3573 SUBJECT: GRB 050712: Swift detection of a weak burst DATE: 05/07/12 15:04:45 GMT FROM: David Burrows at PSU/Swift D. Grupe (PSU), S. Barthelmy (GSFC), J. Cummings, (GSFC/NRC), H. Krimm (GSFC/USRA), C. Markwardt, (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC), D. Burrows, J. Nousek, A. Falcone, C. Gronwall (PSU), T. Poole, A. Blustin (MSSL), and N. Gehrels (GSFC) on behalf of the Swift team: At 14:00:27.51 UT, the Swift Burst Alert Telescope (BAT) triggered and located on-board GRB050712 (trigger=145581). The spacecraft slewed immediately. The flight-determined location is RA,Dec 77.693,+64.899 {+05h 10m 46s,+64d 53' 56"} (J2000) with an uncertainty of 3 arcmin (radius, stat+sys). The burst lightcurve has 4-5 peaks all within ~35 sec duration. This is a weak burst with a peak count rate of 500 cnts/sec in the 15-350 keV band. This burst should not be confused with Trigger=145563 two hours earlier today. Based on preliminary analysis, the BAT team believes the earlier trigger is not a real GRB. The XRT attempted to centroid on the afterglow at 14:03:14 UT (166 s after the BAT trigger) but could not find a bright enough source for a successful on-board centroid. Ground analysis will be required to determine whether there is an X-ray counterpart. The Swift Ultra Violet/Optical (UVOT) observations began at 14:03:11.5 UT, 164 seconds after the BAT trigger. The first data taken after the spacecraft settled was a 100 sec exposure using the V filter with the midpoint of the observation at 214 sec after the BAT trigger. Based on comparisons to the DSS, we detect no new source. The 5-sigma upper limit in the V-filter is 17.94 mag. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3574 SUBJECT: GRB 050712: Swift XRT afterglow position DATE: 05/07/12 15:54:17 GMT FROM: David Burrows at PSU/Swift A. Falcone, D. N. Burrows, D. C. Morris, D. Grupe, J. L. Racusin, J. A. Nousek (PSU), J. Greiner (MPE), D. Hinshaw (GSFC-SPSYS), and N. Gehrels (GSFC) report on behalf of the Swift XRT team: The Swift BAT instrument detected GRB 050712 at 14:00:27.51 UT on 12 July 2005 (Grupe et al. 2005, GCN 3573). The observatory executed an automated slew to the BAT position and the XRT began taking data at 14:03:14 UT (166.1 s after the BAT trigger). The XRT was in Auto state but the source was not initially bright enough for a successful on-board centroid. In ground-processed data we find a bright uncataloged, rapidly fading X-ray source located at: RA(J2000) = 05:10:47.9, Dec(J2000) = +64:54:51.5. We estimate an uncertainty of about 6 arcseconds radius (90% containment). This source is located 56 arcseconds from the BAT position in GCN 3573. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3575 SUBJECT: GRB050712: UVOT candidate optical counterpart DATE: 05/07/12 19:44:20 GMT FROM: Evert Rol at U.Leicester E. Rol (U. Leicester), T. Poole, K. McGowan (MSSL), D. Grupe, J. Nousek (PSU), W. Voges (MPE), and N. Gehrels (GSFC) report on behalf of the Swift UVOT team: Analysis of the quick-look data from the UVOT for GRB050712 (Grupe et al., GCN 3573) reveals a single, relatively bright source inside the XRT error circle (Falcone et al., GCN 3574) which is not visible in the DSS red and blue surveys. Its position is (J2000): RA 5:10:48.1 Dec 64:54:47.6 with the astrometry calibrated to the 2MASS catalogue. An initial estimate of the V-band magnitude for the source over the timespan of 164-264 seconds after the trigger is V = 18.02 +/- 0.29. Further analysis is underway to investigate the variability of the source. We note that the early UVOT findingchart ('genie image') was not centred at BAT position, which resulted in the candidate XRT/UVOT position being outside the field of view of the findingchart. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3576 SUBJECT: GRB 050712: Swift-BAT Refined Analysis DATE: 05/07/12 20:18:09 GMT FROM: Craig Markwardt at NASA/GSFC/UMD C. Markwardt (NASA GSFC/UMD), M. Ajello (MPE), S. Barthelmy, L. Barbier (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), R. Fink, N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), M. Suzuki (Saitama), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the full data set from the recent telemetry downlink, further analysis of Swift-BAT GRB050712 (Trigger #145881; Grupe et al., GCN Circ 3573) yields a refined position of RA, Dec 77.698, +64.931 {05h 10m 48s, +64d 55' 52"} (J2000) with an uncertainty of 3 arcmin (radius, 90% confidence, statistical+systematic). The burst duration (T90) was determined to be 48 +/- 2 seconds (15-350 keV) starting at T-7.8 seconds. The spectrum over the interval from T-11 to T+44 seconds can be fit with a power law with photon index 1.56 +/- 0.18 and yields a fluence of 1.8 X10^-6 erg/cm^2 in the 15-350 keV band. The peak flux in a 1-sec wide window starting at T+17.4 seconds is 0.6 +/- 0.2 ph/cm^2/sec. The light curve is a long smooth "bump" with weak, if any, structure. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3579 SUBJECT: GRB050712: XRT refined analysis DATE: 05/07/13 03:39:58 GMT FROM: Dirk Grupe at PSU/Swift-XRT D. Grupe, D. Burrows, D. Morris, A. Falcone, J. Nousek, P. Meszaros, M. Chester (PSU), N. Gehrels (GSFC), on behalf of the Swift-XRT team: Title: GRB050712: XRT refined analysis We analysed the XRT data of the first four orbits of GRB050712 (GCN 3573, Grupe et al., 2005). The refined position using xrtcentroid is: RA (2000): 05 10 47.31 Dec (2000): +64 54 49.76 The centroiding error is 6 arcsec. This is 62 arcseconds from the refined BAT position (GCN 3576, Markwardt et al., 2005) and 5.5 arcseconds from the tentative UVOT counterpart (GCN 3575, Rol et al., 2005) The WT mode data can be fitted by a single power law with an X-ray slope beta=1.20+/-0.08. The neutral absorption parameter is 1.8e21 1/cm2, which is slightly higher than the Galactic value (1.3e21 1/cm2; Dickey & Lockman 1990). The PC mode data agree with this result within the errors. The light curve shows a fading afterglow with a preliminary decay slope of alpha=0.85+/-0.08. The unabsorber 0.3-10.0 keV flux at 1 hour after the burst is estimated to 6.3e-12 ergs/s/cm2 //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3587 SUBJECT: GRB 050712, optical observations DATE: 05/07/13 09:07:18 GMT FROM: Sylvio Klose at TLS Tautenburg A. Zeh, S. Klose, F. Ludwig, B. Stecklum, Thueringer Landessternwarte Tautenburg, report: We observed the field of GRB 050712 (Grupe et al., GCN 3573) in VRI with the Tautenburg Schmidt telescope starting 21:15 UT on July 12. The stacked R-band images show a faint source at the position reported by Rol et al. (GCN 3575). We estimate R>~20 and note, however, that this source might also be present on the DSS2 red plates. No source is visible in I, implying I>~19. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3596 SUBJECT: GRB050712: Swift UVOT Observation of Afterglow Emission DATE: 05/07/13 17:49:21 GMT FROM: Alexander Blustin at MSSL-UCL This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ---1605949312-135341040-1121276953=:1247092 Content-Type: TEXT/PLAIN; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE T. Poole (MSSL), D. Grupe (PSU), A. Breeveld (MSSL), L. Angelini (GSFC-JHU), J. Greiner (MPE) on behalf of the Swift UVOT team The Swift Ultra-Violet/Optical Telescope (UVOT) began observations of GRB050712 (Grupe et al. GCN 3573; E.Rol et al. GCN 3575) on 12th July 2005 at 14:02:58 UT. We detect a source inside the XRT error circle (Falcone et al. GCN 3574) in the V and U bands. It initially fades, then brightens before fading below the detection threshold. It is not detected in the UV filters. No B observations were taken because of a bright source in the field of view violating the UVOT count rate limits. The aperture for optical observations (V and U) was 6 arcsec and for the UV 12 arcsec. The limiting magnitudes are given to a 3 sigma limit. V filter start exposure mid magnitude time time time after =09after burst burst (s) (s) (s) 164 100 214 17.97 =B1 0.09 - source detection 313 10 318 17.85 =B1 0.20 - source detection 383 10 388 18.69 =B1 0.20 - source detection 455 10 460 18.13 =B1 0.20 - source detection 526 10 531 18.04 =B1 0.20 - source detection 597 10 602 17.99 =B1 0.20 - source detection 668 49 693 17.83 - limiting magnitude 1207 100 1257 18.01 - limiting magnitude 11414 900 11864 22.15 - limiting magnitude U filter start exposure mid magnitude time time time after after burst burst (s) (s) (s) 282 10 287 17.92 =B1 0.20 - source detection 353 10 358 17.82 - limiting magnitude 425 10 430 17.75 - limiting magnitude 425 10 430 19.47 =B1 0.20 - source detection 496 10 501 18.16 =B1 0.20 - source detection 639 49 664 18.50 - limiting magnitude 996 100 1051 18.74 - limiting magnitude 6477 663 6809 19.83 - limiting magnitude UVW1 start exposure mid magnitude time time time after after burst burst (s) (s) (s) 268 107 322 18.49 - limiting magnitude 1970 833 2387 19.62 - limiting magnitude UVM2 - limiting magnitudes start exposure mid magnitude time time time after after burst burst (s) (s) (s) 325 98 374 19.05 - limiting magnitude 1310 46 1333 18.36 - limiting magnitude 4663 1447 723 20.36 - limiting magnitude UVW2 - limiting magnitudes start exposure mid magnitude time time time after after burst burst (s) (s) (s) 298 98 347 19.05 - limiting magnitude 1102 100 1152 20.15 - limiting magnitude 10447 900 10897 21.57 - limiting magnitude We caution that the instrument is not yet fully calibrated and that the magnitude limits presented here may need to be refined. This message may be cited. ---1605949312-135341040-1121276953=:1247092-- //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3601 SUBJECT: GRB050712: TNG R-band observations DATE: 05/07/13 21:17:39 GMT FROM: Nicola Masetti at IASF,CNR,Bologna E. Maiorano, E. Palazzi, N. Masetti (INAF/IASF, Bo), D. Malesani (SISSA), P. D'Avanzo (INAF, OAB), G.L. Israel (INAF, OARm), G. Chincarini (Univ. Milano-Bicocca), L. Stella (INAF, OARm) and M. Pedani (INAF, TNG) report on behalf on a larger collaboration: "We observed the field of GRB 050712 (Grupe et al., GCN 3573; Falcone et al., GCN 3574) with the Italian TNG telescope, located at the Canary Islands. The field was observed before twilight, under a seeing of ~1.4 arcsec, starting on 2003 Jul 13.182 UT (~14.4 h after the GRB). A set of six images, 300 s exposure time each, was acquired in the R filter. Within the XRT error circle (Grupe et al., GCN 3579) we find one source, at a position consistent with that of the OT detected with UVOT (Rol et al., GCN 3575; see also Zeh et al., GCN 3587). Assuming R = 15.8 for the USNO-A2.0 star U1500_0409875 at RA = 05:11:10.51, Dec = +64:55:36.0 (J2000), we measure for the object above a magnitude R = 21.35 +/- 0.05. Further analysis is in progress. This message can be cited." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3635 SUBJECT: GRB050712: optical limits DATE: 05/07/17 16:28:43 GMT FROM: Alexei Pozanenko at IKI, Moscow V.Rumyantsev, E.Sergeeva (CrAO), D.Sharapov, M.Ibrahimov (MAO), G. Kornienko (UAPhO), A.Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We have observed the error box of the Swift GRB050712 (D. Grupe et al., GCN 3573) with 0.4m telescope of Ussuriysk Astrophysical Observatory (UAPhO), 1.5m telescope of Maidanak observatory (MAO), and 0.7m AZT-8 telescope of CrAO on July, 12-13. We do not detect OT found by T. Poole et al. (GCN 3596) and E. Maiorano et al. (GCN 3601). Upper limits of stacked images calibrated against of R USNO-A2.0 are following: Start time, Exposure, Filter, Limiting mag. (UT) (s) July,12 15:06 4x60 none 15.0 July,12 23:09 3x180 R 19.0 July,13 00:36 11x60 R 19.5 Detailed analysis of the observed images is underway. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3646 SUBJECT: GRB 050712, Tautenburg optical afterglow observations DATE: 05/07/19 16:22:14 GMT FROM: Andreas Zeh at TLS Tautenburg A. Zeh, D. A. Kann, S. Klose (Thueringer Landessternwarte Tautenburg, Germany), A. Manning, C. Riddle (Clemson University, SC, USA), report: We observed the field of GRB 050712 (Grupe et al. 2005, GCN 3573) with the Tautenburg 1.34m Schmidt telescope in the R filter at two epochs. The first set of observations consisted of 10 x 30 second exposures, mid-exposure time UT 050712.937, i.e. 0.353 days after the GRB. The second set of observations consisted of 20 x 30 second exposures, mid-exposure time UT 050713.948, i.e. 1.364 days after the burst. A comparison of our combined first epoch image with our deeper second epoch image shows that the potential optical counterpart of the afterglow (Zeh et al. 2005, GCN 3587) has faded away. Thus, we confirm the earlier report by Rol et al. (2005, GCN 3575) that the source at coordinates RA, DEC (J2000) = 5:10:48.1, +64:54:47.6 is the optical counterpart of the X-ray afterglow (Falcone et al. 2005, GCN 3574; Grupe et al. 2005, GCN 3579). Assuming R = 15.8 for the USNO-A2.0 star U1500_0409875 at RA, DEC (J2000) = 05:11:10.51, +64:55:36.0 (Maiorano et al. 2005, GCN 3601), we find the following magnitudes for the GRB 050712 afterglow: UT mid t-t_0 (days) mag_Rc 12.937 0.353 20.7 +/- 0.4 13.948 1.364 > 21.5 We find that the decay slope alpha is about 1.2 using the data point by Maiorano et al. (2005, GCN 3601). This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3650 SUBJECT: GRB050712: Radio Observations DATE: 05/07/20 17:37:03 GMT FROM: Patrick B. Cameron at Caltech P. B. Cameron reports on behalf of the Caltech-NRAO-Carnegie collaboration: "We observed the field of GRB050712 (GCN 3573) with the Very Large Array at 8.5 GHz on July 17.56 and 19.46. No radio source is detected at the position of the optical transient (GCN 3575) with a 3-sigma upper limit of 96 uJy from the combined images. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."