{
  "bibcode": "2008GCN..8600....1C",
  "body": "A. Copete, J. Grindlay (Harvard)\nS. Barthelmy, C. Markwardt, N. Gehrels (NASA/GSFC)\n\nWe report the detection of a GRB candidate by the BAT Slew Survey  \n(BATSS) in the slew that started at 13:52:02 UT. This is 309 sec  \nbefore the trigger time for the GRB that followed (A. M. Parsons et  \nal, GCN 8595), which occurs at a different location and should  \nhereafter be referred to as GRB 081203B.\nThe ground-calculated position of GRB 081203A is RA, Dec = 228.789,  \n+44.427 deg, which is\n  RA (J2000) = 15h 15m 09s\n  Dec (J2000) = +44d 25' 36\"\nwith an uncertainty of 3.04 arcmin (90% confidence, including  \nsystematics). The detection was triggered by simultaneous\nindependent detections of 11.0 sigma and 5.6 sigma from imaging in the  \n15-50 keV and 50-150 keV energy bands, respectively. The burst mask- \ntagged lightcurve shows 2 main peaks, the larger one at T+24sec and  \nlasting 2sec as the burst enters the BAT FoV, the second one at T \n+30sec with a duration of 2sec, and it has largely faded as the  \npointing observation that follows begins. The measured T90 = 23.4sec  \nand T50 = 8.2sec (15-150keV).\n\nPreliminary spectral analysis from T+24.0 to T+50.4 shows a time- \naveraged spectrum that is best fit by a simple power law with photon  \nindex of 1.65. The total fluence in the 15-150 keV band is 2.1 x 10^-6  \nerg/cm2, and the 1-sec peak flux is 3.5 x 10^-7 erg/cm2/sec.\n\nA follow-up Swift ToO observation has been scheduled to begin at 18:26  \nUT, 4.6 hours after the burst.",
  "circularId": 8600,
  "createdOn": 1228330442000,
  "email": "acopete@head.cfa.harvard.edu",
  "subject": "GRB 081203A: Burst detection from Swift-BAT slew data",
  "submitter": "Antonio Copete at Harvard U  <acopete@head.cfa.harvard.edu>",
  "eventId": "GRB 081203A"
}