{
  "bibcode": "2015GCN.18292....1M",
  "body": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),\nJ. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC),\nH. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU), R. L. C. Starling (U Leicester),\nT. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry\ndownlink,\nwe report further analysis of BAT GRB 150911A (trigger #655262)\n(Starling, et al., GCN Circ. 18280). The BAT ground-calculated position is\nRA, Dec = 67.428, 5.731 deg which is\n   RA(J2000)  =  04h 29m 42.6s\n   Dec(J2000) = +05d 43' 50.2\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 67%.\n\nThe mask-weighted light curve shows a broad peak starting around\nT-2 sec and ending around T+10 sec. T90 (15-350 keV) is\nT90 (15-350 keV) is 7.2 +- 0.6 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-1.04 to T+9.61 sec is best fit by a power\nlaw\nwith an exponential cutoff.  This fit gives a photon index 1.02 +- 0.26,\nand Epeak of 51.6 +- 3.8 keV (chi squared 52.34 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 2.1 +- 0.1 x 10^-06\nerg/cm2\nand the 1-sec peak flux measured from T+3.90 sec in the 15-150 keV band is\n5.2 +- 0.3 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 1.93 +- 0.05 (chi squared 97.49 for 57 d.o.f.).  All the quoted errors\nare at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/655262/BA/",
  "circularId": 18292,
  "createdOn": 1442069238000,
  "email": "tilan.ukwatta@gmail.com",
  "subject": "GRB 150911A: Swift-BAT refined analysis",
  "submitter": "Tilan Ukwatta at LANL  <tilan.ukwatta@gmail.com>",
  "eventId": "GRB 150911A"
}