{
  "bibcode": "2020GCN.29139....1K",
  "body": "H. A. Krimm (NSF), S. D. Barthelmy (GSFC),\nS. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), K. L. Page (U Leicester),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU), T. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 201221D (trigger #1014037)\n(Page et al., GCN Circ. 29112).  The BAT ground-calculated position is\nRA, Dec = 171.055, 42.152 deg which is\n   RA(J2000)  =  11h 24m 13.2s\n   Dec(J2000) = +42d 09' 08.4\"\nwith an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 23%.\n\nThe mask-weighted light curve shows a single-peaked structure that\nstarts at ~T-0.06 s, peaks at ~T+0.02 s, and ends at ~T+0.2 s.\nT90 (15-350 keV) is 0.16 +- 0.04 sec (estimated error including\nsystematics).\n\nThe time-averaged spectrum from T-0.06 to T+0.17 sec is best fit by\na simple power-law model.  The power law index of the time-averaged\nspectrum is 1.56 +- 0.13.  The fluence in the 15-150 keV band is\n3.9 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from\nT-0.44 sec in the 15-150 keV band is 5.6 +- 0.5 ph/cm2/sec.\nAll the quoted errors are at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1014037/BA/",
  "circularId": 29139,
  "createdOn": 1608659055000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 201221D: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 201221D"
}