{
  "bibcode": "2010GCN.10658....1C",
  "body": "J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nN. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD),\nD. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU),\nM. C. Stroh (PSU), J. Tueller (GSFC), T. N. Ukwatta (GWU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-61 to T+242 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 100423A (trigger #420247)\n(Stroh, et al., GCN Circ. 10651).  The BAT ground-calculated position is\nRA, Dec = 136.471, 21.487 deg, which is \n   RA(J2000)  =  09h 05m 53.0s \n   Dec(J2000) = +21d 29' 13.4\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 74%.\n \nThe mask-weighted light curve shows a couple small peaks starting at ~T-4 sec,\nthen a large peak at T_zero and peaking at ~T+0.1 sec, and then a long roughly\nexponential decay out to T+160 where the burst went out of the BAT FOV\ndue a slew to avoid an observing constraint.  We cannot quote a T90,\nbecause there was still burst emission when it went out of the FOV.\n \nThe time-averaged spectrum from T-12.9 to T+99.1 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.07 +- 0.05.  The fluence in the 15-150 keV band is 8.5 +- 0.2 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+10.60 sec in the 15-150 keV band\nis 1.2 +- 0.2 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/420247/BA/",
  "circularId": 10658,
  "createdOn": 1272023141000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 100423A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 100423A"
}