{
  "bibcode": "2013GCN.15303....1H",
  "body": "L. M. Z. Hagen (PSU), D. N. Burrows (PSU), V. D'Elia (ASDC),\nN. Gehrels (NASA/GSFC), J. A. Kennea (PSU), V. Mangano (PSU),\nF. E. Marshall (NASA/GSFC) and B. Sbarufatti (INAF-OAB/PSU) report on\nbehalf of the Swift Team:\n\nAt 21:41:03 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 131004A (trigger=573190).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 296.151, -2.960 which is \n   RA(J2000) = 19h 44m 36s\n   Dec(J2000) = -02d 57' 35\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a single-peaked\nstructure with a duration of about 2 sec.  The peak count rate\nwas ~8500 counts/sec (15-350 keV), at ~0 sec after the trigger. \n\nThe XRT began observing the field at 21:42:13.4 UT, 70.0 seconds after\nthe BAT trigger. Using promptly downlinked data we find an uncatalogued\nX-ray source located at RA, Dec 296.11549, -2.95806 which is equivalent\nto:\n   RA(J2000)  = 19h 44m 27.72s\n   Dec(J2000) = -02d 57' 29.0\"\nwith an uncertainty of 3.6 arcseconds (radius, 90% containment). This\nlocation is 127 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 in excess of the Galactic value (6.97 x\n10^20 cm^-2, Kalberla et al. 2005), with an excess column of 4.5\n(+2.61/-2.22) x 10^21 cm^-2 (90% confidence). \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 75 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 BAT 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 0.28. \n\nBurst Advocate for this burst is L. M. Z. Hagen (lea.zernow.hagen AT gmail.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": 15303,
  "createdOn": 1380923637000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 131004A: Swift detection of a burst (may be short)",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 131004A"
}