{
  "bibcode": "2005GCN..3573....1G",
  "body": "D. Grupe (PSU), S. Barthelmy (GSFC), J. Cummings, (GSFC/NRC),\nH. Krimm (GSFC/USRA), C. Markwardt, (GSFC/UMD), D. Palmer (LANL),\nT. Sakamoto (GSFC), D. Burrows, J. Nousek, A. Falcone, C. Gronwall (PSU),\nT. Poole, A. Blustin (MSSL), and N. Gehrels (GSFC) on behalf of the Swift team:\n\n\nAt 14:00:27.51 UT, the Swift Burst Alert Telescope (BAT) triggered and located\non-board GRB050712 (trigger=145581).  The spacecraft slewed immediately.\nThe flight-determined location is RA,Dec 77.693,+64.899 {+05h 10m 46s,+64d \n53' 56\"} (J2000) with an uncertainty of 3 arcmin (radius, stat+sys).  The \nburst lightcurve\nhas 4-5 peaks all within ~35 sec duration.  This is a weak burst with a peak\ncount rate of 500 cnts/sec in the 15-350 keV band.\n\nThis burst should not be confused with Trigger=145563 two hours earlier \ntoday.\nBased on preliminary analysis, the BAT team believes the earlier trigger is \nnot\na real GRB.\n\n\nThe XRT attempted to centroid on the afterglow at 14:03:14 UT (166 s after the\nBAT trigger) but could not find a bright enough source for a successful \non-board\ncentroid.  Ground analysis will be required to determine whether there is \nan X-ray\ncounterpart.\n\nThe Swift Ultra Violet/Optical (UVOT) observations began at 14:03:11.5 UT,\n164 seconds after the BAT trigger.  The first data taken after the spacecraft\nsettled was a 100 sec exposure using the V filter with the midpoint of the\nobservation at 214 sec after the BAT trigger.  Based on comparisons to the\nDSS, we detect no new source. The 5-sigma upper limit in the V-filter is \n17.94 mag.",
  "circularId": 3573,
  "createdOn": 1121180685000,
  "email": "dxb15@psu.edu",
  "subject": "GRB 050712: Swift detection of a weak burst",
  "submitter": "David Burrows at PSU/Swift  <dxb15@psu.edu>",
  "eventId": "GRB 050712"
}