{
  "bibcode": "2017GCN.22229....1C",
  "body": "J. R. Cummings (CPI), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF/USRA), S. J. LaPorte (PSU),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU), T. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+400 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 171209A (trigger #796100)\n(LaPorte et al., GCN Circ. 22213).  The BAT ground-calculated position is\nRA, Dec = 139.387, -30.523 deg which is\n  RA(J2000)  =  09h 17m 32.8s\n  Dec(J2000) = -30d 31' 22.4\"\nwith an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 61%.\n\nThe mask-weighted light curve shows a multi-peaked structure that starts at\n~ T-70 s and ends at ~ T+230 s. T90 (15-350 keV) is 161.7 +- 30.8 sec (estimated\nerror including systematics).\n\nThe time-averaged spectrum from T-70.76 to T+228.44 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.58 +- 0.07.  The fluence in the 15-150 keV band is 7.5 +- 0.3 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+79.52 sec in the 15-150 keV band\nis 1.6 +- 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/796100/BA/",
  "circularId": 22229,
  "createdOn": 1512928220000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 171209A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 171209A"
}