{
  "bibcode": "2008GCN..7986....1C",
  "body": "J. K. Cannizzo (NASA/UMBC), D. N. Burrows (PSU),\nN. Gehrels (NASA/GSFC), C. Gronwall (PSU), C. Guidorzi (INAF-OAB),\nS. T. Holland (CRESST/USRA/GSFC), C. B. Markwardt (CRESST/GSFC/UMD),\nC. Pagani (PSU), D. M. Palmer (LANL), T. N. Ukwatta (GSFC/GWU) and\nP. A. Ward (MSSL-UCL) report on behalf of the Swift Team:\n\nAt 00:23:41 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated a possible GRB (trigger=317393).  Swift slewed immediately to \nthe location.  The BAT on-board calculated location is \nRA, Dec 162.521, -10.495 which is \n   RA(J2000) = 10h 50m 05s\n   Dec(J2000) = -10d 29' 42\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  As is usual for a 64-second image trigger,\nthere is no obvious variation in the immediately available light curve. \n\nThe XRT began observing the field at 00:26:12.4 UT, 151.3 seconds after\nthe BAT trigger. No source was detected in the promptly available XRT\ndata. We are waiting for the full dataset to detect and localise the\nXRT counterpart. \n\nUVOT took a finding chart exposure of 100 seconds with the White\n(160-650 nm)  filter starting 98 seconds after the BAT trigger. No\nafterglow candidate has  been found in the initial data products. The\ntypical 3-sigma upper limit has been about 18.5 mag.  The 8'x8' region\nfor the list of sources generated on-board covers 100% of the BAT\nerror circle. The list of sources is typically complete to about 18\nmag. No correction has been made for extinction. \n\nBased on the marginal significance of the BAT detection, and the\nlack of an XRT or UVOT detection, we cannot confirm the reality of this source. \nWe note, however, that the source 1RXS J105002.8-103240 is located at\nthe edge of the BAT error circle.  More information will be available \nfollowing the next downlink at about 0120 UT. \n\nBurst Advocate for this burst is J. K. Cannizzo (cannizzo AT milkyway.gsfc.nasa.gov). \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": 7986,
  "createdOn": 1216514986000,
  "email": "palmer@lanl.gov",
  "subject": "Trigger 317393: Swift detection of a possible GRB",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>"
}