{
  "bibcode": "2017GCN.21973....1U",
  "body": "T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), \nS. B. Cenko (GSFC), J. R. Cummings (CPI),\nH. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Sakamoto (AGU), M. Stamatikos (OSU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 171004A (trigger #776347)\n(Cenko et al., GCN Circ. 21966).  The BAT ground-calculated position is\nRA, Dec = 139.150, 52.684 deg which is \n   RA(J2000)  =  09h 16m 35.9s \n   Dec(J2000) = +52d 41' 01.5\" \nwith an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 42%.\n \nThe mask-weighted light curve shows several overlapping peaks that starts\nat ~ T+9 and ends at ~ T+160 s. The burst location went out of the BAT FOV\nat ~ T+580 s, and thus we only have information of the burst emission before\nthen. T90 (15-350 keV) is 107.1 +- 14.5 sec (estimated error including \nsystematics).\n \nThe time-averaged spectrum from T+9.08 to T+138.31 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.67 +- 0.12. The fluence in the 15-150 keV band is 3.0 +- 0.2 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+48.34 sec in the 15-150 keV band\nis 0.9 +- 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/776347/BA/",
  "circularId": 21973,
  "createdOn": 1507151594000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 171004A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 171004A"
}