{
  "bibcode": "2015GCN.18496....1P",
  "body": "D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),\nN. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), A. Maselli (INAF-IASFPA), T. Sakamoto (AGU),\nM. Stamatikos (OSU), T. N. Ukwatta (LANL) (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 151027A (trigger #661775)\n(Maselli et al., GCN Circ. 18478).  The BAT ground-calculated position is\nRA, Dec = 272.498, 61.361 deg which is\n  RA(J2000)  =  18h 09m 59.6s\n  Dec(J2000) = +61d 21' 39.6\"\nwith an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 18%.\n\nThe mask-weighted light curve shows a complex structure with roughly two main\npulses. The first pulse starts at ~T0, peaks at ~T+1 s, and ends at ~T+5 s. The\nsecond pulse starts at ~T+90 s, peaks at ~T+110 s, and ends at ~T+170 s.\nT90 (15-350 keV) is 129.69 +- 5.55 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.74 to T+164.70 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.72 +- 0.05.  The fluence in the 15-150 keV band is 7.8 +- 0.2 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.20 sec in the 15-150 keV band\nis 6.8 +- 0.6 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/661775/BA/",
  "circularId": 18496,
  "createdOn": 1445971913000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 151027A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 151027A"
}