TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4315 SUBJECT: GRB 051210: Swift detection of a burst DATE: 05/12/10 06:26:53 GMT FROM: Scott Barthelmy at NASA/GSFC V. Mangano (INAF-IASS), S. Barthelmy (GSFC), D. Burrows (PSU), J. Cummings (GSFC/NRC), N. Gehrels (GSFC), S. Hunsberger (PSU), D. Palmer (LANL), A. Parsons (GSFC) on behalf of the Swift team: At 05:46:21 UT, Swift-BAT triggered and located GRB 051210 (trigger=171931). The spacecraft slewed immediately. The BAT on-board calculated location is RA,Dec 330.197d,-57.634d {22h 00m 47s,-57d 38' 01"} (J2000), with an uncertainty of 3 arcmin (radius, 90% containment, stat+sys). The BAT light curve shows two ~1-sec peaks with a total duration of ~6 sec. The peak count rate was ~2200 counts/sec (15-350 keV), at ~0 sec after the trigger. XRT began observing the field at 05:47:40.40, 79.2 sec after the BAT trigger. Onboard centroiding found a bright fading uncatalogued X-ray source in the field of view at the following coordinates: RA(J2000): 22h 00m 41.7s Dec(J2000): -57d 36' 48.2" We estimate the uncertainty of this position to be 6 arcsec (radius, 90% containment). This position is 84 arcsec from the BAT position above. The source initial flux is 9.7e-10 erg/cm2/sec. The UVOT data products were delayed and the results will be forthcoming in a second Circular. /////////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4316 SUBJECT: GRB 051210: A short GRB in a cluster? DATE: 05/12/10 06:43:43 GMT FROM: Edo Berger at Carnegie Obs E. Berger (Carnegie Observatories) and D. Fox (Penn State) report: "The position of GRB 051210 (GCN 4315) is located about 8' from the center of the galaxy cluster APMCC 736 (Dalton et al. 1997, MNRAS, 289, 263) with an estimated radius of at least 6' and z=0.114. We note that the XRT position (GCN 4315) does not contain any obvious galaxy possibly indicating a chance coincidence. However, the burst duration and temporal structure may indicate a short GRB." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4317 SUBJECT: GRB051210: Swift UVOT Observation DATE: 05/12/10 07:30:33 GMT FROM: Sally Hunsberger at PSU/Swift on behalf of the Swift UVOT team. The Swift Ultra-Violet/Optical Telescope began observing the field at 05:47:43 UT, 82.5 seconds after BAT trigger 171931 (Mangano et al. GCN 4315). The 200s V-band image shows no optical counterpart within the XRT positional error circle (Mangano et al. GCN 4315). [GCN OPS NOTE(10dec05): Per author's request, the reference citation was changed from Barthelmy to Mangano.] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4318 SUBJECT: GRB 051210: Swift-BAT refined analysis of a short burst DATE: 05/12/10 08:54:24 GMT FROM: David Palmer at LANL G. Sato (ISAS), L. Angelini (GSFC-JHU), L. Barbier (GSFC), S. Barthelmy (GSFC), M. Chester (PSU), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the BAT data set from T-60 to T+120 sec from the recent telemetry downlink, we report further analysis of GRB 051210 (trigger #171931, Mangano, et al., GCN 4315). The BAT ground-calculated position is (RA,Dec) = 330.194,-57.623 (deg. J2000) {22h 0m 46.6s, -57d 37'21.0"} 2.0 arcmin radius (sys+stat, 90% containment). The partial coding was 90%. The burst light curve shape is a single, symmetric triangular peak. T90 (15-350 keV) is 1.4 +- 0.2 sec (estimated error including systematics). The power law index of the time-averaged spectrum is 1.1 +- 0.3. The fluence in the 15-150 keV band is (8.3 +- 1.4) x 10^-8 erg/cm2. The 1-sec peak photon flux measured starting from T+0.1 sec in the 15-150 keV band is (7.5 +- 1.2) x 10^-1 ph/cm2/sec. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4319 SUBJECT: GRB 051210: FRAM early limit DATE: 05/12/10 13:10:40 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada Martin Jelinek (IAA Granada, Spain), Petr Kubanek (ISDC Versoix, Swizerland and ASU Ondrejov, Czech Republic), Michael Prouza (FZU Praha, Czech Republic) Martin F. Nekola and Rene Hudec (ASU Ondrejov, Czech Republic) report We have observed GRB051210 using robotic telescope FRAM located in Malargue, Argentina, with it's Wide Field camera, starting 57.5s after the event. The first 10s exposure shows no counterpart at the XRT position reported by Mangano et al. (GCN 4315) down to 2-sigma limit R=14.0. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4320 SUBJECT: GRB 051210: Swift XRT refined analysis DATE: 05/12/10 13:35:32 GMT FROM: David Burrows at PSU/Swift V. Mangano, G. Cusumano, V. La Parola (INAF-IASF), D. N. Burrows (PSU), L. Angelini (GSFC-JHU), and N. White (GSFC) report on behalf of the Swift team: We have analyzed the Swift XRT data from the first observation of GRB 051210 (Mangano et al. 2005, GCN 4315) consisting of three orbits (about 5.7 ks exposure). The refined coordinates of the X-ray afterglow are: RA(J2000) = +22h 00m 41.3s Dec(J2000) = -57d 36' 48.2" with an estimated uncertainty of 4.2 arcseconds radius (90% containment). The XRT boresight correction has been applied through the new TELDEF file provided by the Swift Science Data Center (Angelini et al. 2005, GCN 4313). This position is 54.4 arcsec from the revised BAT position given in GCN 4318 (Sato et al. 2005) and 3 arcsec from the XRT position determined on board (Mangano et al. 2005, GCN 4315). The 0.2-10 keV light curve, that starts in Windowed Timing (WT) mode 87.3 seconds after the BAT trigger, shows a fading behaviour with a decaying slope of 2.3+/-0.1 over the first two orbits and is not detectable anymore during the third (the expected count rate at the end of the third orbit would be 7.0e-4 c/s). A preliminary spectral fit to WT and PC data of the first two orbits with an absorbed power law gives a photon index of 1.5+/-0.1 and an absorption column of (7.5 +/- 3) x 1e20 cm^-2. The Galactic absorption in the GRB direction is 2.2e20 cm^-2. Assuming the current steep decay we predict a flux lower than 1.e-16 erg cm^-2 s^-1 at one day from the burst. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4321 SUBJECT: GRB 051210: BAT further refined analysis of the short burst DATE: 05/12/10 21:33:04 GMT FROM: Scott Barthelmy at NASA/GSFC S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), N. Gehrels (GSFC), J. Norris (GSFC), D. Palmer (LANL), A. Parsons (GSFC) on behalf of the Swift-BAT team: The BAT team now believes this burst to be definitely short. The formal T90 value is 1.2 +/- 0.2 sec (Sato, Circ 4318). The 6-sec_duration statement in our 1st circ (Mangano, Circ 4315) was based on a non-background-subtracted raw TDRSS lightcurve. We now have the mask-tagged lightcurve with a ground energy scale calibration applied to the events, and the 2nd peak at T+6 sec is not present (it may be attributable to a background fluctuation or noisy detector(s)). We further note that the peak at T0 is resolved into 3 separate peaks which is not uncommon in the BATSE short bursts. The spectral lag (Norris & Bonnell, submitted to ApJ) for this burst is -0.0010 sec (+0.0150 -0.0170 sec); very typical for short bursts. Swift-XRT & UVOT follow-up observations are continuing and we encourage other follow-up observations on this short burst. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4322 SUBJECT: GRB 051210: SALT detection limit DATE: 05/12/10 21:52:31 GMT FROM: Martin Still at NASA/GSFC Swift SSC M. Still, A. Kniazev, S. Siyengo (SAAO) The Southern African Large Telescope, currently in Performance-Verification phase, observed the field of GRB 051210 during evening twilight, and through thickening cloud, with the Salticam CCD camera. Based on comparison with nearby sources, and assuming R-I = 0, we find no sources inside the Swift-XRT error circle (Mangano et al; GCN 4315) down to a limiting magnitude of I = 20.2 at 2005/12/10 18:48 UT. [GCN OPS NOTE(12dec05): The Subject line was changed from 051201 to 051210.] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4323 SUBJECT: GRB 051210: Optical imaging from Las Campanas DATE: 05/12/11 02:13:57 GMT FROM: Edo Berger at Carnegie Obs E. Berger (Carnegie Observatories) and A. Boss (Carnegie DTM) reoprt: "We imaged the error circle of GRB 051210 (GCNs 4318, 4320) with the du Pont 100-inch telescope at Las Campanas Observatory in I-band for a total of 30 min starting on 2005 December 11.04 UT (19.2 hours after the burst). The images were obtained at an airmass of about 1.4 and an average seeing of about 0.8". We do not detect any objects within the XRT error circle to an estimated 5-sigma limit of I>23 mag." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4330 SUBJECT: GRB 051210: Magellan Imaging DATE: 05/12/12 00:42:27 GMT FROM: Josh Bloom at UC Berkeley J. S. Bloom (UC Berkeley), M. Modjaz (CfA/Harvard), P. Challis (CfA/Harvard), R. P. Kirshner (CfA/Harvard), W.-W. Chen (Chicago), J. X. Prochaska (UCO/Lick) report: Starting 11 Dec 2005 01:10:41 UTC, we observed the field of the short burst GRB 051210 (Mangano et al. 4315, 4320; Sato et al. 4318) with the 6.5m Clay/Magellan using the LDSS3 instrument (*). In a stack of 2x10min exposures in r'-band, we find one clearly detected source consistent the revised (GCN 4320) error circle. The J2000 coordinates of this source is: RA = 22:00:40.93 DEC = -57:36:47.1 We make no claim of variability at this time, and note that the source appears somewhat extended (north by north east). In addition there appears to be a marginally detected source at (end figures) 41.41, 47.0. Follow-up is encouraged." A finding chart may be found at: http://astro.berkeley.edu/~jbloom/grb051210_find.pdf (red diamonds are USNO B1.0 positions) This message may be cited. (*) http://www.ociw.edu/lco/magellan/instruments/LDSS3/ //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4331 SUBJECT: GRB 051210: Swift/UVOT upper limits DATE: 05/12/12 01:34:05 GMT FROM: Alexander Blustin at MSSL-UCL A. J. Blustin (UCL-MSSL), V. Mangano (INAF-IASS), W. Voges (MPE), F. Marshall (GSFC), N. Gehrels (GSFC) on behalf of the Swift/UVOT team report: The Swift/UVOT began observing the field of GRB 051210 at 05:47:43 UT on 2005-12-10, 70 s after the BAT trigger (Mangano et al., GCN 4315). No source was observed in any of the UVOT filters at the refined XRT position (Mangano et al., GCN 4320) or at the position of the Magellan source (Bloom et al. GCN 4330). 3-sigma upper limits in summed images from each of the filters are listed below (not corrected for extinction; E(B-V) = 0.019). Filter T_range(s) Exp(s) 3sigUL(mag) V 70-76498 3721 20.6 B 450-74933 4954 21.7 U 395-70715 4276 21.2 W1 341-81624 4338 21.7 M2 287-80716 4377 22.1 W2 558-75839 4005 22.3 White 503-931 100 19.9 //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4333 SUBJECT: GRB 051211A and GRB051211B: BOOTES simultaneous observations DATE: 05/12/12 07:14:03 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia M. Jelínek, A. J. Castro-Tirado, S. Vitek, A. de Ugarte Postigo (IAA-CSIC Granada), P. Kubánek and R. Hudec (Astronomical Institute of the Academy of Sciences, Ondrejov), report: The BOOTES instruments in South Spain responded to the two GRBs detected on 11 Nov 2005. The BOOTES-2 very wide field camera located at La Mayora (EELM-CSIC, Málaga) observed the region of the sky containing the HETE-2/SXC error box for GRB 051211A (Atteia et al. GCN 4324) as part of the routinary observing schedule. A 30s exposure started at 2:50:00 UT (5s prior to the beginning of the 33s long burst), i.e. overlaping with the single, hard gamma-ray peak detected by HETE-2. This image sets a R = 10 upper limit to the promt optical flash for GRB 051211A. BOOTES-1 in El Arenosillo (INTA, Huelva), responded under non-optimal conditions to the GRB 051211B trigger (Mereghetti et al. GCNC 4327). A sequence of exposures started at 22:06:34 UT (50s after the GRB onset, 30s after the GCN notice), i.e. overlaping for 30 s with the tail of the gamma-ray emission. We do no detect any transient optical emission in the 2' INTEGRAL error box and in particular at the position of the possible afterglow reported by Klotz et al. (GCNC 4328). We set a I > 14 limit to any optical emission arising simultaneusly to the gamma-rays. We also notice moderate extinction in the line of sight: E(B-V) = 0.47 from the Schlegel et al. dust maps (1998)." This message can be quoted. Alberto J. Castro-Tirado wrote: > M. Jelínek, A. J. Castro-Tirado, S. Vitek, A. de Ugarte > Postigo,(IAA-CSIC Granada), P. Kubánek and R. Hudec (Astronomical > Institute of the Academy of Sciences, Ondrejov), > report: > > The BOOTES instruments in South Spain responded to the two GRBs > detected on 11 Nov 2005. > The BOOTES-2 very wide field camera located at La Mayora (EELM-CSIC, > Málaga) observed the region of the sky containing the HETE-2/SXC error > box for GRB 051211A (Atteia et al. GCN 4324) as part of the routinary > observing schedule. A 30s exposure started at 2:50:00 UT (5s prior to > the beginning of the 33s long burst), i.e. overlaping with the single, > hard gamma-ray peak detected by HETE-2. This image sets a R = 10 upper > limit to the promt optical flash for GRB 051211A. > > BOOTES-1 in El Arenosillo (INTA, Huelva), responded under non-optimal > conditions to the GRB 051211B trigger (Mereghetti et al. GCNC 4327). A > sequence of exposures started at 22:06:34 UT (50s after the GRB onset, > 30s after the GCN notice), i.e. overlaping for 30 s with the tail of > the gamma-ray emission. We do no detect any transient optical emission > in the 2' INTEGRAL error box and in particular at the position of the > possible afterglow reported by Klotz et al. (GCNC 4328). We set a I > > 14 limit to any optical emission arising simultaneusly to the > gamma-rays. We also notice moderate extinction in the line of sight: > E(B-V) = 0.47 from the Schlegel et al. dust maps (1998)." > This message can be quoted.