{
  "bibcode": "2017GCN.22241....1K",
  "body": "H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), J. D. Gropp (PSU),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nJ. P. Norris (BSU), D. M. Palmer (LANL),\nT. Sakamoto (AGU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-60 to T+243 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 171211A (trigger #796469)\n(Gropp et al., GCN Circ. 22234).  The BAT ground-calculated position is\nRA, Dec = 98.154, -58.689 deg which is\n  RA(J2000)  =  06h 32m 36.9s\n  Dec(J2000) = -58d 41' 19.0\"\nwith an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 57%.\n\nThe mask-weighted light curve shows a single-peaked structure that starts and\npeaks at ~ T0, and ends at ~T+3 s. T90 (15-350 keV) is 2.32 +- 0.59 sec\n(estimated error including systematics).\n\nThe time-averaged spectrum from T+0.03 to T+2.70 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.77 +- 0.21.  The fluence in the 15-150 keV band is 2.4 +- 0.3 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.03 sec in the 15-150 keV band\nis 2.3 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nThe duration and hardness of this burst show it to be intermediate between the\nshort and long burst populations.\n\nUsing a 64-ms binned light curve, the lag analysis finds a lag of\n0.144 (+0.106, -0.066) s for the 50-100 keV to 15-25 keV band.\nDespite the large error bars due to the weakness of this burst,\nthis value is more consistent with those of a long GRB.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/796469/BA/",
  "circularId": 22241,
  "createdOn": 1513034355000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 171211A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 171211A"
}