//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14936 SUBJECT: GRB 130627B: Swift detection of a burst DATE: 13/06/27 12:12:55 GMT FROM: David Palmer at LANL S. R. Oates (UCL-MSSL), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), V. D'Elia (ASDC), P. A. Evans (U Leicester), S. T. Holland (STScI), A. Y. Lien (NASA/GSFC/ORAU), D. Malesani (DARK/NBI), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 12:00:50 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130627B (trigger=559139). Due to an Earth limb constraint Swift could not immediately slew to the burst. The BAT on-board calculated location is RA, Dec 181.932, -55.730 which is RA(J2000) = 12h 07m 44s Dec(J2000) = -55d 43' 47" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 40 sec. The peak count rate was ~1300 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+48.4 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is S. R. Oates (samantha.oates AT ucl.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14938 SUBJECT: GRB 130627B: Swift-XRT observations DATE: 13/06/27 13:53:24 GMT FROM: Phil Evans at U of Leicester S. Campana (INAF-OAB), G. Cusumano (INAF-IASF PA), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), D.N. Burrows (PSU) and J.A. Kennea (PSU) report on behalf of the Swift-XRT team: The XRT began observing the field of GRB 130627B at 12:50:47.2 UT, 2996.6 seconds after the BAT trigger. No source was detected in 1.8 ks of promptly downlinked data, which covered 96% of the BAT error circle. We are waiting for the full dataset to detect and localise the XRT counterpart. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14939 SUBJECT: GRB130627B: Swift/UVOT Observations DATE: 13/06/27 13:53:30 GMT FROM: Samantha Oates at MSSL S. R. Oates & M. De Pasquale (UCL-MSSL) report on behalf of the Swift/UVOT Team: UVOT took a finding chart exposure of 150 seconds with the White filter starting 3754 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete down to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.40. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14947 SUBJECT: GRB 130627B: Possible Swift-XRT afterglow detection DATE: 13/06/28 08:03:34 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) & S.R. Oates (MSSL-UCL) report on behalf of the Swift-XRT team: In 3.3 ks of XRT data for GRB 130627B (Oates et al. GCN Circ. 14936), from 3.7 ks to 11.2 ks after the BAT trigger we find an uncatalogued X-ray sources at RA, Dec = 181.91308, -55.7008 which is equivalent to: RA (J2000): 12 07 39.14 Dec(J2000): -55 42 02.9 with an uncertainty of 4.2 arcsec (radius, 90% confidence). The mean count rate in this interval is 8.8(+/-2.0) x 10^-3 ct/sec, and we cannot determine at the present time whether the source is fading. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14950 SUBJECT: GRB 130627B: Swift/UVOT Upper Limits DATE: 13/06/28 21:31:13 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin and S. R. Oates (UCL-MSSL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130627B 3755 s after the BAT trigger (Oates et al., GCN Circ. No. 14936 and 14939). No optical afterglow consistent with the XRT position Evans et al. GCN Circ. No. 14947 is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 3755 3905 147 >20.3 white 3755 5137 344 >20.9 v 3911 5474 320 >19.5 b 4733 4932 197 >20.1 u 4526 4726 197 >19.7 w1 4321 11240 757 >20.3 m2 4116 10664 1082 >20.4 w2 5143 5343 197 >19.7 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.40 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14952 SUBJECT: GRB 130627B, Swift-BAT refined analysis DATE: 13/06/28 23:48:31 GMT FROM: Amy Lien at GSFC M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), S. R. Oates (UCL-MSSL), D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130627B (trigger #559139) (Oates, et al., GCN Circ. 14936). The BAT ground-calculated position is RA, Dec = 181.914, -55.706 deg which is RA(J2000) = 12h 07m 39.3s Dec(J2000) = -55d 42' 20.3" with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 95%. The mask-weighted light curve shows a single peak starting at ~T-6 sec, peaking at ~T+2 sec, and ending at ~T+22 sec. T90 (15-350 keV) is 28.6 +- 5.8 sec (estimated error including systematics). The time-averaged spectrum from T-10.5 to T+26.0 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.13 +- 1.03, and Epeak of 47.6 +- 8.7 keV (chi squared 56.72 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 6.1 +- 0.8 x 10^-07 erg/cm2 and the 1-sec peak flux measured from T+1.82 sec in the 15-150 keV band is 0.8 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.79 +- 0.16 (chi squared 68.34 for 57 d.o.f.). All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/559139/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14966 SUBJECT: GRB 130627B: Swift afterglow confirmation DATE: 13/07/03 07:35:49 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) and S. R. Oates (UCL-MSSL) report on behalf of the Swift-XRT team: Swift performed a second epoch observation of GRB 130627B (Oates et al., GCN Circ. 14936) on 2013 July 2nd, collecting 7.3 ks of Photon Counting mode data from T0+390 ks to T0+415 ks. The X-ray object reported by Evans et al. (GCN Circ. 14947) is no longer detected. The 3-sigma upper limit is 1.7 x 10^-3 ct/sec, which is well below the level of 8.8(+/-2.0) x 10^-3 ct/sec at which the source was previously detected. We therefore confirm that this object was the afterglow of GRB 130627B. This circular is an official product of the Swift-XRT team.