{
  "bibcode": "2021GCN.31326....1L",
  "body": "A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC),  H. A. Krimm (NSF), S. Laha\n(GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan\n(GSFC/UMBC), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT\nteam):\n\n\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 211227A (trigger #1091101)\n(Beardmore et al., GCN 31316).  The BAT ground-calculated position is RA,\nDec = 132.144, -2.736 deg which is\n\n   RA(J2000)  =  08h 48m 34.5s\n\n   Dec(J2000) = -02d 44' 10.9\"\n\nwith an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The\npartial coding was 41%.\n\n\n\nThe BAT light curve showed a complex structure with a duration of about 100\nsec. T90 (15-350 keV) is 83.79 +- 8.47 sec (estimated error including\nsystematics).\n\n\n\nThe time-averaged spectrum from 0.04 to 126.3 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is 1.60\n+- 0.05.  The fluence in the 15-150 keV band is 8.0 +- 0.2 x 10^-06\nerg/cm2. The 1-sec peak photon flux measured from T+0.06 sec in the 15-150\nkeV band is 5.1 +- 0.4 ph/cm2/sec.  All the quoted errors are at the 90%\nconfidence level.\n\n\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1091101/BA/",
  "circularId": 31326,
  "createdOn": 1640710891000,
  "email": "parsotat@umbc.edu",
  "subject": "GRB 211227A: Swift-BAT refined analysis",
  "submitter": "Tyler Parsotan at UMBC/GSFC/CRESST II  <parsotat@umbc.edu>",
  "eventId": "GRB 211227A"
}