{
  "bibcode": "2022GCN.32854....1L",
  "body": "A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC), R. Brivio (INAF-OAB),\r\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC), C. B. Markwardt (GSFC),\r\nD. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\r\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\r\n\r\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\r\nwe report further analysis of BAT GRB 221024A (trigger #1131029)\r\n(Brivio, et al., GCN Circ. 32827).  The BAT ground-calculated position is\r\nRA, Dec = 169.702, 33.068 deg which is\r\n   RA(J2000)  =  11h 18m 48.6s\r\n   Dec(J2000) = +33d 04' 04.9\"\r\nwith an uncertainty of 2.9 arcmin, (radius, sys+stat, 90% containment).\r\nThe partial coding was 35%.\r\n\r\nThe mask-weighted light curve shows a rather weak pulse starting at the trigger\r\ntime, peaking around T+5 seconds and decaying to baseline by about T+40 seconds.\r\nThere is some low-level emission following this peak, including a possible peak\r\nIn the low-energy bands at approximately T+200 seconds. The pipeline-calculated\r\nT90 (15-350 keV) is 120+-111 sec (estimated error including systematics), with the\r\nlarge stated error due to uncertainty in whether the possible T+200 peak contains\r\nat least 5% of the burst fluence.\r\n\r\nThe time-averaged spectrum from T+0.00 to T+221.28 sec is best fit by a simple\r\npower-law model.  The power law index of the time-averaged spectrum is\r\n1.39 +- 0.25.  The fluence in the 15-150 keV band is 1.5 +- 0.2 x 10^-6 erg/cm2.\r\nThe 1-sec peak photon flux measured from T+2.93 sec in the 15-150 keV band\r\nis 1.5 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence\r\nlevel.\r\n\r\nThe results of the batgrbproduct analysis are available at\r\nhttp://gcn.gsfc.nasa.gov/notices_s/1131029/BA/",
  "circularId": 32854,
  "createdOn": 1666795674000,
  "email": "hkrimm@nsf.gov",
  "subject": "GRB 221024A: Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NSF/NASA-GSFC  <hkrimm@nsf.gov>",
  "eventId": "GRB 221024A"
}