{
  "bibcode": "2022GCN.33115....1L",
  "body": "S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), S. B. Cenko (GSFC),\r\nH. A. Krimm (NSF), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\r\nD. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\r\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\r\n\r\nUsing the data set from T-240 to T+963 sec from the recent telemetry downlink,\r\nwe report further analysis of BAT GRB 221226B (trigger #1145959)\r\n(Cenko, et al., GCN Circ. 33108).  The BAT ground-calculated position is\r\nRA, Dec = 22.903, -41.515 deg which is\r\n  RA(J2000)  =  01h 31m 36.7s\r\n   Dec(J2000) = -41d 30' 52.5\"\r\nwith an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).\r\nThe partial coding was 97%.\r\n\r\nThe mask-weighted light curve shows a pulse of approximately 4 seconds\r\ntotal duration and some substructure.   T90 (15-350 keV) is 3.44 +- 0.57 sec\r\n(estimated error including systematics).\r\n\r\nThe time-averaged spectrum from T+0.22 to T+4.28 sec is best fit by a simple\r\npower-law model.  The power law index of the time-averaged spectrum is\r\n1.16 +- 0.13.  The fluence in the 15-150 keV band is 5.4 +- 0.5 x 10^-7 erg/cm2.\r\nThe 1-sec peak photon flux measured from T+0.24 sec in the 15-150 keV band\r\nis 2.6 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence\r\nlevel.\r\nThe results of the batgrbproduct analysis are available at\r\nhttp://gcn.gsfc.nasa.gov/notices_s/1145959/BA/",
  "circularId": 33115,
  "createdOn": 1672179775000,
  "email": "hkrimm@nsf.gov",
  "subject": "GRB 221226B Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NSF/NASA-GSFC  <hkrimm@nsf.gov>",
  "eventId": "GRB 221226B"
}