{
  "bibcode": "2008GCN..7591....1S",
  "body": "G. Sato (GSFC/ISAS), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC),\nJ. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),\nH. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), F. E. Marshall (GSFC),\nK. McLean (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC),\nM. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-187 to T+723 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 080411 (trigger #309010)\n(Marshall, et al., GCN Circ. 7584).  The BAT ground-calculated position is\nRA, Dec = 37.961, -71.297 deg, which is \n   RA(J2000)  =  02h 31m 50.6s \n   Dec(J2000) = -71d 17' 49.6\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 86%.\n \nThe mask-weighted light curve shows two clusters of overlapping peaks.\nThe first starts at T+0.0 sec and rises to a peak in 1 sec.  The second peak\nis at T+7 sec; the third at T+10 sec, and the 4th at T+19 sec at 25 cnt/cm2/sec\n(15-150 keV).  The lightcurve returns to background before the beginning\nof the second cluster of peaks.  The 5th peak starts at ~T+39 sec,\nrises linearly, peaking at ~T+41 src at 43 cnts/cm2/sec.  There are two more\nmuch smaller peaks at T+55 and T+64 sec.  The lightcurve returns to background\nby ~T+95 sec.  There is a gap in the downlinked data from T+300 to T+420 sec.\nIt appears that the burst has returned to background well before this gap,\nbut should later downlinks show on-going activity, we will issue an updated\ncircular.  T90 (15-350 keV) is 56 +- 1 sec (estimated error including\nsystematics).\n \nThe time-averaged spectrum from T-0.0 to T+84.3 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.75 +- 0.03.  The fluence in the 15-150 keV band is 2.64 +- 0.01 x 10^-5 erg/cm2.\nThe 1-sec peak photon flux measured from T+40.45 sec in the 15-150 keV band\nis 43.2 +- 0.9 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/309010/BA/",
  "circularId": 7591,
  "createdOn": 1208010724000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 080411, Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 080411"
}