{
  "subject": "GRB 230628E: Swift-BAT refined analysis",
  "bibcode": "2023GCN.34134....1P",
  "body": "T. Parsotan (GSFC/UMBC), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), 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 230628E (trigger #1177054)\n(Salvaggio et al., GCN Circ. 34110).  The BAT ground-calculated position is\nRA, Dec = 171.851, -11.430 deg which is\n   RA(J2000)  =  11h 27m 24.3s\n   Dec(J2000) = -11d 25' 46.5\"\nwith an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 41%.\n\nThe BAT  light curve shows a complex structure with a duration of ~ 15 sec.\nT90 (15-350 keV) is 4.72 +- 1.08 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.50 to T+4.81 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.45 +- 0.30.  The fluence in the 15-150 keV band is 3.3 +- 0.6 x 10^-07 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.33 sec in the 15-150 keV band\nis 1.1 +- 0.3 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/1177054/BA/\n\n",
  "createdOn": 1688303030052,
  "submitter": "Sibasish Laha at GSFC <sibasish.laha@nasa.gov>",
  "eventId": "GRB 230628E",
  "circularId": 34134
}