{
  "bibcode": "2017GCN.21879....1P",
  "body": "D. M. Palmer (LANL), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), H. A. Krimm (NSF/USRA),\nS. J. LaPorte (PSU), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), T. Sakamoto (AGU),\nM. Stamatikos (OSU), T. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+480 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 170912B (trigger #772052)\n(LaPorte et al., GCN Circ. 21864).  The BAT ground-calculated position is\nRA, Dec = 215.464, -61.997 deg which is\n  RA(J2000)  =  14h 21m 51.3s\n  Dec(J2000) = -61d 59' 50.8\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n\nThe mask-weighted light curve shows several overlapping pulses that starts\nat ~ T0 and ends at ~ T+40 s. T90 (15-350 keV) is 19.6 +- 6.2 sec\n(estimated error including systematics).\n\nThe time-averaged spectrum from T-0.93 to T+38.75 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.88 +- 0.07.  The fluence in the 15-150 keV band is 2.4 +- 0.1 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.07 sec in the 15-150 keV band\nis 5.7 +- 0.3 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/772052/BA/",
  "circularId": 21879,
  "createdOn": 1505266921000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 170912B: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 170912B"
}