{
  "bibcode": "2021GCN.31209....1S",
  "body": "M. Stamatikos (OSU), S. D. Barthelmy (GSFC),\nA. D'Ai (INAF-IASFPA), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+360 sec from the recent telemetry\ndownlink,\nwe report further analysis of BAT GRB 211211A (trigger #1088940)\n(D'Ai et al., GCN Circ. 31202).  The BAT ground-calculated position is\nRA, Dec = 212.272, 27.884 deg which is\n   RA(J2000)  =  14h 09m 05.2s\n   Dec(J2000) = +27d 53' 03.8\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 21%.\n\nThe mask-weighted light curve shows a multi-peaked structure that\nstarts at ~T0 and ends at ~T+140 s. The main peak occurs at ~T+7 s.\nT90 (15-350 keV) is 51.37 +- 0.80 sec (estimated error including\nsystematics).\n\nThe time-averaged spectrum from T0 to T+142.2 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.56 +- 0.02.  The fluence in the 15-150 keV band is 1.5 +- 0.02 x 10^-04\nerg/cm2.\nThe 1-sec peak photon flux measured from T+6.86 sec in the 15-150 keV band\nis 155.0 +- 3.1 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/1088940/BA/",
  "circularId": 31209,
  "createdOn": 1639278849000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 211211A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 211211A"
}