{
  "bibcode": "2019GCN.26495....1M",
  "body": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU), E. Troja (GSFC/UMD),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 191218A (trigger #944916)\n(Troja et al., GCN Circ. 26480).  The BAT ground-calculated position is\nRA, Dec = 301.070, -40.277 deg which is\n   RA(J2000)  =  20h 04m 16.7s\n   Dec(J2000) = -40d 16' 38.8\"\nwith an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 9%.\n\nThe mask weighted light curve shows two peaks at ~T+4 s and ~T+45 s. The\noverall structure starts at ~T-2 s and lasts till ~T+58 s.\nT90 (15-350 keV) is 44.67 +- 0.73 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.23 to T+46.03 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.12 +- 0.10.  The fluence in the 15-150 keV band is 7.8 +- 0.4 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.66 sec in the 15-150 keV band\nis 6.3 +- 0.9 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/944916/BA/",
  "circularId": 26495,
  "createdOn": 1576727633000,
  "email": "sibasish.laha@nasa.gov",
  "subject": "GRB 191218A: Swift-BAT refined analysis",
  "submitter": "Sibasish Laha at GSFC  <sibasish.laha@nasa.gov>",
  "eventId": "GRB 191218A"
}