{
  "subject": "GRB 230618A: Swift-BAT refined analysis",
  "body": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), D. M. Palmer (LANL),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-275 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 230618A (trigger #1175438)\n(Page et al., GCN Circ. 33989).  The BAT ground-calculated position is\nRA, Dec = 196.642, 3.278 deg which is\n   RA(J2000)  =  13h 06m 34.1s\n   Dec(J2000) = +03d 16' 39.6\"\nwith an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n\nThe BAT light curve showed a complex structure with a duration of about 200 sec.\nT90 (15-350 keV) is 104.05 +- 22.86 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-27.78 to T+107.00 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.35 +- 0.15.  The fluence in the 15-150 keV band is 1.5 +- 0.2 x 10^-06 erg/cm2.\nThe 1-sec peak photon flux measured from T+9.04 sec in the 15-150 keV band\nis 0.5 +- 0.1 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/1175438/BA/\n\n\n",
  "createdOn": 1687826398258,
  "bibcode": "2023GCN.34085....1M",
  "circularId": 34085,
  "submitter": "Sibasish Laha at GSFC <sibasish.laha@nasa.gov>",
  "eventId": "GRB 230618A"
}