{
  "circularId": 36543,
  "body": "A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC),\nR. Gupta (GSFC), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), C. B. Markwardt (GSFC),\nM. J. Moss (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC), D. Sadaula (GSFC/UMBC),\nT. Sakamoto (AGU), M. H. Siegel (PSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 240523A (trigger #1230423)\n(Siegel et al., GCN Circ. 36536).  The BAT ground-calculated position is\nRA, Dec = 33.537, -22.053 deg which is\n   RA(J2000)  =  02h 14m 08.9s\n   Dec(J2000) = -22d 03' 10.6\"\nwith an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 47%.\n\nThe mask-weighted light curve shows a multi-peaked structure that\nstarts at ~T-6 s and ends at ~T+46 s. The main peak occurs at ~T+1 s.\nT90 (15-350 keV) is 41.93 +- 8.66 sec (estimated error including\nsystematics).\n\nThe time-averaged spectrum from T-6.37 to T+46.30 sec is best fit by a\nsimple\npower-law model.  The power law index of the time-averaged spectrum is\n2.07 +- 0.20.  The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6\nerg/cm2.\nThe 1-sec peak photon flux measured from T+0.18 sec in the 15-150 keV band\nis 1.0 +- 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\nhttps://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1230423\n",
  "subject": "GRB 240523A: Swift-BAT refined analysis",
  "bibcode": "2024GCN.36543....1L",
  "eventId": "GRB 240523A",
  "submittedHow": "email",
  "createdOn": 1716750884174,
  "submitter": "Amy <yarleen@gmail.com>"
}