{
  "bibcode": "2010GCN.10875....1U",
  "body": "T. N. Ukwatta (GWU) S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nJ. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),\nC. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),\nM. Stamatikos (GSFC/ORAU), J. Tueller (GSFC),\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-240 to T+962 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 100621A (trigger #425151)\n(Ukwatta, et al., GCN Circ. 10870).  The BAT ground-calculated position is\nRA, Dec = 315.309, -51.102 deg, which is \n   RA(J2000)  =  21h 01m 14.1s \n   Dec(J2000) = -51d 06' 08.8\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 97%.\n \nThe mask-weighted light curve shows three main overlapping peaks starting\nat ~T-8 sec, with the main peak at ~T+25 sec, and ending at ~T+220 sec.\nT90 (15-350 keV) is 63.6 +- 1.7 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T-6 to T+204 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.90 +- 0.03.  The fluence in the 15-150 keV band is 2.1 +- 0.0 x 10^-5 erg/cm2.\nThe 1-sec peak photon flux measured from T+24.46 sec in the 15-150 keV band\nis 12.8 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel. \n \nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/425151/BA/",
  "circularId": 10875,
  "createdOn": 1277125827000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 100621A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 100621A"
}