{
  "bibcode": "2005GCN..3768....1C",
  "body": "J. Cummings (GSFC/NRC), S. Barthelmy (GSFC),  D. Burrows (PSU), \nM. Chester (PSU), N. Gehrels (GSFC),  M. Goad (U. Leicester), \nO. Godet (U. Leicester), J. Kennea (PSU), C. Markwardt (GSFC/UMD), \nA. Morgan (PSU), C. Pagani (PSU), K. Page (U. Leicester), D. Palmer (LANL), \nT. Sakamoto (GSFC/NRC)\non behalf of the Swift team:\n\nAt 20:41:26.7 UT, Swift-BAT triggered and located potential GRB 050805B\n(trigger=149131).  The spacecraft slewed immediately.  The BAT\non-board calculated location is RA,Dec 306.005d, +37.213d {+20h 24m\n01s, +37d 12' 46\"} (J2000), with an uncertainty of 3 arcmin (radius,\n90% containment, stat+sys).  The trigger duration is 32 milliseconds,\nand the image significance was 6.3 sigma.  At that level, we consider\nthe BAT detection itself to be marginal.\n\nXRT began observing the burst at 20:42:40.8 UT, 74 seconds after the BAT \ntrigger.  The XRT was not able to centroid on a point source in the field, \nhowever the full field lightcurve shows a significant elevation above \nbackground, suggesting the presence of an X-ray source in the field. A \ncatalogue search reveals no known X-ray sources in the field, suggesting \nthis X-ray source is the X-ray afterglow.  There is evidence of fading in \nthe lightcurve, which will require ground processing to confirm.\n\nUVOT began observing the burst at 20:42:38.6 UT, 72 seconds after the BAT \ntrigger.  In a preliminary ground-processed 100-sec image, no new sources \nare found when compared to the DSS catalog down to a 5-sigma limiting \nmagnitude of V > 19.0.",
  "circularId": 3768,
  "createdOn": 1123277945000,
  "email": "jayc@milkyway.gsfc.nasa.gov",
  "subject": "Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst",
  "submitter": "Jay R. Cummings at NASA/GSFC/Swift  <jayc@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 050805B"
}