{
  "bibcode": "2017GCN.22153....1U",
  "body": "T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), P. A. Evans (U Leicester),\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-240 to T+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 171123A (trigger #791922)\n(Evans et al., GCN Circ. 22148).  The BAT ground-calculated position is\nRA, Dec = 186.198, 32.503 deg which is\n  RA(J2000)  =  12h 24m 47.6s\n  Dec(J2000) = +32d 30' 12.5\"\nwith an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 86%.\n\nThe mask-weighted light curve shows a weak pulse that starts at ~T-1 s and ends\nat ~T+20 s, with a tail lasting till ~T+60 s. In addition, there is a weak\nprecursor from ~T-25 s to ~T-20 s. T90 (15-350 keV) is 58.5 +- 27.1 sec\n(estimated error including systematics).\n\nThe time-averaged spectrum from T-1.39 to T+60.29 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.35 +- 0.34.  The fluence in the 15-150 keV band is 4.8 +- 1.0 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.27 sec in the 15-150 keV band\nis 0.8 +- 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/791922/BA/",
  "circularId": 22153,
  "createdOn": 1511482492000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 171123A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 171123A"
}