{
  "subject": "GRB 231230A: Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>",
  "bibcode": "2024GCN.35474....1L",
  "circularId": 35474,
  "eventId": "GRB 231230A",
  "body": "S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC),  H. A. Krimm (NSF),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC),\nD. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 231230A (trigger #1205319)\n(Moss, et al., GCN Circ. 35436).  The BAT ground-calculated position is\nRA, Dec = 245.223, 58.132 deg which is\n   RA(J2000)  =  16h 20m 53.5s\n   Dec(J2000) = +58d 07' 54.2\"\nwith an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 35%.\n\nThe mask-weighted light curve shows a complex structure extending from\naround T+0 to T+20.  T90 (15-350 keV) is 15.2 +- 0.9 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T+0.26 to T+17.26 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.28 +- 0.10.  The fluence in the 15-150 keV band is 2.1 +- 0.1 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+7.64 sec in the 15-150 keV band\nis 2.2 +- 0.4 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/1205319/BA/\n\n\n",
  "createdOn": 1704290841744,
  "submittedHow": "email"
}