{
  "createdOn": 1683152788572,
  "body": "M. Stamatikos (OSU), 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. Parsotan (GSFC/UMBC),\nT. Sakamoto (AGU), (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 230427A (trigger #1165948)\n(Troja et al., GCN Circ. 33687).  The BAT ground-calculated position is\nRA, Dec = 153.339, 48.231 deg which is\n   RA(J2000)  =  10h 13m 21.5s\n   Dec(J2000) = +48d 13' 52.3\"\nwith an uncertainty of 3.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 86%.\n\nThe BAT light curve showed a complex structure with a duration of about 20 sec.\nT90 (15-350 keV) is 4.00 +- 1.41 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.17 to T+3.83 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n2.36 +- 0.47.  The fluence in the 15-150 keV band is 9.5 +- 2.9 x 10^-08 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.17 sec in the 15-150 keV band\nis 0.7 +- 0.2 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/1165948/BA/\n\n\n",
  "submitter": "Sibasish Laha at GSFC <sibasish.laha@nasa.gov>",
  "bibcode": "2023GCN.33722....1S",
  "circularId": 33722,
  "subject": "GRB 230427A: Swift-BAT refined analysis",
  "eventId": "GRB 230427A"
}