{
  "bibcode": "2011GCN.12551....1B",
  "body": "W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),\nN. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC),\nC. Pagani (U Leicester), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),\nM. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-240 to T+645 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 111109A (trigger #507342)\n(Pagani, et al., GCN Circ. 12548).  The BAT ground-calculated position is\nRA, Dec = 118.248, -41.588 deg, which is \n   RA(J2000)  =  07h 52m 59.5s \n   Dec(J2000) = -41d 35' 18.3\" \nwith an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 91%.\n \nThe mask-weighted light curve shows a couple overlapping peaks starting\nat ~T-5 sec, peaking at ~T+2 sec, and ending at ~T+20 sec.  There is a\nhint of possible precursor activity (~2 sigma) at ~T-110 sec.  We note\nthat the burst location went out of the BAT FoV at ~T+120 sec (a slew\ndue to an observing constraint).  T90 (15-350 keV) is 13.0 +- 3.2 sec\n(estimated error including systematics).\n \nThe time-averaged spectrum from T-5.60 to T+8.40 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.86 +- 0.26.  The fluence in the 15-150 keV band is 2.4 +- 0.4 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+1.40 sec in the 15-150 keV band\nis 0.5 +- 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/507342/BA/",
  "circularId": 12551,
  "createdOn": 1320848095000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 111109A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 111109A"
}