{
  "bibcode": "2017GCN.20566....1U",
  "body": "T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC),\nJ. K. Cannizzo (NASA/UMBC), J. R. Cummings (CPI),\nN. Gehrels (GSFC), H. A. Krimm (NSF/USRA),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nJ. P. Norris (BSU), D. M. Palmer (LANL),\nT. Sakamoto (AGU), M. Stamatikos (OSU),\n\n(i.e. the Swift-BAT team):\n\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 170127B (trigger #735331)\n(Cannizzo et al., GCN Circ. 20540).  The BAT ground-calculated position is\nRA, Dec = 19.997, -30.340 deg which is\n   RA(J2000)  =  01h 19m 59.2s\n   Dec(J2000) = -30d 20' 25.2\"\nwith an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 75%.\n\nThe mask-weighted light curve shows a single-peaked structure that starts\nand peaks at ~T0, and ends at ~T+0.6 s. T90 (15-350 keV) is 0.51 +- 0.14 sec\n(estimated error including systematics).\n\nThe time-averaged spectrum from T+0.05 to T+0.64 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n0.89 +- 0.25.  The fluence in the 15-150 keV band is 1.0 +- 0.2 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.16 sec in the 15-150 keV band\nis 1.1 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nUsing a 8-ms binned light curve, the lag analysis finds a lag of -4 (-17, +8) ms\nfor the 100-350 keV to 25-50 keV, and -12 (-8, +8) ms for the 50-100 keV to\n15-25 keV band. These values are consistent with those of a short GRB. Moreover,\nno extended emission are found.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/735331/BA/",
  "circularId": 20566,
  "createdOn": 1485705781000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 170127B: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 170127B"
}