{
  "bibcode": "2013GCN.15533....1S",
  "body": "E. Sonbas (NASA/GSFC/Adiyaman Univ.), W. H. Baumgartner (GSFC/UMBC),\nM. G. Bernardini (INAF-OAB), S. B. Cenko (GSFC),\nP. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), P. A. Evans (U Leicester),\nN. Gehrels (NASA/GSFC), S. T. Holland (STScI),\nA. Y. Lien (NASA/GSFC/ORAU), D. Malesani (DARK/NBI),\nC. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC),\nA. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB),\nP. T. O'Brien (U Leicester), K. L. Page (U Leicester),\nD. M. Palmer (LANL), M. H. Siegel (PSU),\nR. L. C. Starling (U Leicester) and E. Troja (NASA/GSFC/UMCP) report\non behalf of the Swift Team:\n\nAt 15:06:24 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 131128A (trigger=579683).  Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 355.323, +31.279 which is\n   RA(J2000) = 23h 41m 18s\n   Dec(J2000) = +31d 16' 45\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty).  The BAT light curve showed a single FRED peak\nstructure with a duration of about 3 sec with a possible precursor\naround T-8.  The peak count rate was ~3000 counts/sec (15-350 keV),\nat ~0 sec after the trigger.\n\nThe XRT began observing the field at 15:07:51.3 UT, 86.8 seconds after\nthe BAT trigger. Using promptly downlinked data we find a fading,\nuncatalogued X-ray source with an enhanced position: RA, Dec 355.3084,\n31.3057 which is equivalent to:\n   RA(J2000)  = 23h 41m 14.02s\n   Dec(J2000) = +31d 18' 20.7\"\nwith an uncertainty of 2.2 arcseconds (radius, 90% containment). This\nlocation is 106 arcseconds from the BAT onboard position, within the\nBAT error circle. This position may be improved as more data are\nreceived; the latest position is available at\nhttp://www.swift.ac.uk/sper.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density consistent with the Galactic value of 5.16\nx 10^20 cm^-2 (Kalberla et al. 2005).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 90 seconds after the BAT trigger. No credible afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image covers none of\nthe XRT error circle. The 8'x8' region for the list of sources generated\non-board covers 100% of the XRT error circle. The list of sources is typically\ncomplete to about 18 mag. No correction has been made for the expected\nextinction corresponding to E(B-V) of 0.07.\n\nBurst Advocate for this burst is E. Sonbas (edasonbas AT yahoo.com).\nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/too.html.)",
  "circularId": 15533,
  "createdOn": 1385652159000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 131128A: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 131128A"
}