{
  "format": "text/plain",
  "submitter": "Mike Moss at NASA GSFC <mikejmoss3@gmail.com>",
  "eventId": "GRB 251003A",
  "bibcode": "2025GCN.42103....1L",
  "createdOn": 1759539170265,
  "subject": "GRB 251003A: Swift-BAT refined analysis",
  "circularId": 42103,
  "submittedHow": "web",
  "body": "S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), \nA. P. Beardmore (U Leicester), R. Gupta (GSFC),\nH. A. Krimm (NSF), A. Y. Lien (U Tampa),\nC. B. Markwardt (GSFC), M. J. Moss (GSFC),\nD. M. Palmer (LANL), T. Parsotan (GSFC),\nD. Sadaula (GSFC/UMBC), T. Sakamoto (AGU)\n(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 251003A (trigger #1400964)\n(Beardmore, et al., GCN Circ. 42070).  The BAT ground-calculated position is\nRA, Dec = 18.495, 56.483 deg which is \n   RA(J2000)  =  01h 13m 58.7s \n   Dec(J2000) = +56d 28' 57.1\" \nwith an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 97%.\n \nThe mask-weighted light curve displays a single fast-rise exponential decay pulse\nlasting between ~T0-2 sec and ~T0+10 seconds. T90 (15-350 keV) is 10.78 +- 2.35 sec \n(estimated error including systematics).\n \nThe time-averaged spectrum from T-2.41 to T+9.80 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.64 +- 0.15.  The fluence in the 15-150 keV band is 4.1 +- 0.4 x 10^-07 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.92 sec in the 15-150 keV band\nis 1.0 +- 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\nhttps://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1400964"
}