{
  "bibcode": "2005GCN..4376....1B",
  "body": "P. Boyd (GSFC), S. Barthelmy (GSFC), D. Burrows (PSU),\nJ. Cummings (GSFC/NRC), N. Gehrels (GSFC), H. Krimm (GSFC/USRA),\nC. Markwardt (GSFC/UMD), F. Marshall (GSFC), K. Page (U Leicester),\nD. Palmer (LANL), A. Parsons (GSFC), J. Racusin (PSU), P. Roming (PSU),\nT. Sakamoto (GSFC)\non behalf of the Swift team:\n\nAt 20:03:20 UT, Swift-BAT triggered and located a source (trigger=173904).\nThe spacecraft slewed promptly after the end of the image trigger.\nThe BAT on-board calculated location is RA,Dec 312.395d,+53.054d\n{20h 49m 35s,+53d 03' 14\"} (J2000), with an uncertainty of 3 arcmin\n(radius, 90% containment, stat+sys).  All we have at this time is\nthe TDRSS lightcurve.  This plus the fact that this is a 192-sec\nimage trigger means that we can not say if this trigger is due to a real GRB,\na hard x-ray transient, or a noise event.  We note that the galactic\nlatitude is 6 deg.\n\nThe XRT began observing the location at 20:07:56 UT, 276 sec after the\nBAT trigger.  The on-board detection algorithm did not centroid\non a source due to insufficient counts, so no prompt X-ray position\nis available.  However, both the prompt XRT light-curve and raw spectrum\nindicate there is a faint X-ray source in the field.  More information\nwill be available after the next Malindi pass in a few hours.\n\nUVOT took a finding chart exposure of 200 seconds with the V filter\nstarting 275 seconds after the BAT trigger.  No afterglow candidate\nhas been found in the initial data products.  The 2.7'x2.7' sub-image\ncovers 25% of the BAT error circle.  The typical 3-sigma upper limit has\nbeen about 18th mag.  The 8'x8' region for the list of sources generated\non-board covers 100% of the BAT error circle.  The list of sources is\ntypically complete to about 18.0 mag.  No correction has been made for\nthe expected visual extinction of about 4.6 magnitudes.",
  "circularId": 4376,
  "createdOn": 1135198314000,
  "email": "Scott@lheamail.gsfc.nasa.gov",
  "subject": "Swift-BAT detection of a possible burst",
  "submitter": "Scott Barthelmy at NASA/GSFC  <Scott@lheamail.gsfc.nasa.gov>"
}