{
  "bibcode": "2005GCN..3158....1M",
  "body": "C. B. Markwardt (GSFC/UMD), L. Barbier (GSFC), S. Barthelmy (GSFC),\nJ. Cannizzo (GSFC/UMBC), J. Cummings (GSFC/NRC), M. DePasquale (MSSL),\nE. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), \nH. Krimm (GSFC/USRA), D. Palmer (LANL), A. Parsons (GSFC),\nT. Sakamoto (GSFC/NRC), G. Sato (ISAS), A. Smale (NASA HQ),\nM. Suzuki (Saitama), J. Tueller (GSFC)\non behalf of the Swift team:\n\nAt 18:44:04 UT Swift-BAT triggered on GRB 050331b, trigger 112981, a\nsecond burst within ninety minutes. The BAT-derived position is\nRA,Dec= 143.840,-42.678 (J2000).  We note this is 81 arcsec from the\nXRT Position GCN Notice.  The lightcurve has a series of\nlow-significance peaks covering a total burst duration of ~30 sec.\nThe light curve also shows a slow rise from T+60 to T+160 s in the\nlowest energy bands.  We believe that this slow variation is due to\nVela X-1, which is within 10 degrees of the GRB position.  While\nsimilar in duration to GRB 050331a, the light curve of GRB 050331b is\nsignificantly different in appearance.  The peak count rate is ~1000\ncnts/sec.\n\nNOTE: This is the second verified burst of the day.  The earlier\nburst, now called GRB 050331a, trigger 112977, was located 2.6 degrees\naway from this burst (trigger 112981).  The wide angular separation,\nand dissimilar light curves make it highly unlikely that these two\nbursts are a gravitationally lensed pair.  The two bursts GRB 050331a\nand GRB 050331b are two distinct bursts.",
  "circularId": 3158,
  "createdOn": 1112298758000,
  "email": "craigm@milkyway.gsfc.nasa.gov",
  "subject": "Swift-BAT detection of GRB 050331b",
  "submitter": "Craig Markwardt at NASA/GSFC/UMD  <craigm@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 050331B"
}