{
  "bibcode": "2009GCN.10136....1C",
  "body": "J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nP.A. Curran (MSSL-UCL), E. E. Fenimore (LANL), N. Gehrels (GSFC),\nH. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL),\nA. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS),\nM. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-239 to T+903 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 091104 (trigger #374875)\n(Curran, et al., GCN Circ. 10130).  The BAT ground-calculated position is\nRA, Dec = 208.723, 47.391 deg, which is \n   RA(J2000)  =  13h 54m 53.6s \n   Dec(J2000) = +47d 23' 25.8\" \nwith an uncertainty of 2.6 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 82%.\n \nThe mask-weighted light curve shows a sharp rise at ~T+2, a rather flat top,\nand ending at ~T+120 sec.  T90 (15-350 keV) is 99.3 +- 20 sec\n(estimated error including systematics).\n \nThe time-averaged spectrum from T-1.5 to T+120.5 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.74 +- 0.24.  The fluence in the 15-150 keV band is 7.7 +- 1.2 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+83.34 sec in the 15-150 keV band\nis 0.4 +- 0.1 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/374875/BA/",
  "circularId": 10136,
  "createdOn": 1257366416000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 091104: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 091104"
}