{
  "subject": "GRB 051210: BAT further refined analysis of the short burst",
  "eventId": "GRB 051210",
  "bibcode": "2005GCN..4321....1B",
  "createdOn": 1134250384000,
  "circularId": 4321,
  "submitter": "Scott Barthelmy at NASA/GSFC  <Scott@lheamail.gsfc.nasa.gov>",
  "email": "Scott@lheamail.gsfc.nasa.gov",
  "body": "S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), N. Gehrels (GSFC),\nJ. Norris (GSFC), D. Palmer (LANL), A. Parsons (GSFC)\non behalf of the Swift-BAT team:\n\nThe BAT team now believes this burst to be definitely short.  The formal\nT90 value is 1.2 +/- 0.2 sec (Sato, Circ 4318).  The 6-sec_duration statement\nin our 1st circ (Mangano, Circ 4315) was based on a non-background-subtracted\nraw TDRSS lightcurve.  We now have the mask-tagged lightcurve with a\nground energy scale calibration applied to the events, and the 2nd peak\nat T+6 sec is not present (it may be attributable to a background fluctuation or\nnoisy detector(s)).  We further note that the peak at T0 is resolved\ninto 3 separate peaks which is not uncommon in the BATSE short bursts.\n\nThe spectral lag (Norris & Bonnell, submitted to ApJ) for this burst\nis -0.0010 sec (+0.0150 -0.0170 sec); very typical for short bursts.\n\nSwift-XRT & UVOT follow-up observations are continuing and we encourage\nother follow-up observations on this short burst."
}