{
  "bibcode": "2025GCN.40055....1K",
  "body": "H. A. Krimm (NSF), S. D. Barthelmy (GSFC),\nS. B. Cenko (GSFC),  R. Gupta (GSFC),\nS. Laha (GSFC/UMBC), 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-137 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 250330A (trigger #1299776)\n(Cenko, et al., GCN Circ. 39938).  The BAT ground-calculated position is\nRA, Dec = 252.685, -86.875 deg which is\n   RA(J2000)  =  16h 50m 44.5s\n   Dec(J2000) = -86d 52' 29.6\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 98%.\n\nThe mask-weighted light curve shows a single well defined fast-rise exponential-\ndecay pulse shape. the T90 (15-350 keV) is 11.27 +- 2.53 sec (estimated error\nincluding systematics).\n\nThe time-averaged spectrum from T-0.16 to T+14.33 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.72 +- 0.10.  The fluence in the 15-150 keV band is 9.2 +- 0.6 x 10^-07 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.26 sec in the 15-150 keV band\nis 4.0 +- 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\nhttps://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1299776",
  "subject": "GRB 250330A Swift-BAT refined analysis",
  "eventId": "GRB 250330A",
  "submitter": "Mike Moss at NASA GSFC <mikejmoss3@gmail.com>",
  "submittedHow": "web",
  "circularId": 40055,
  "createdOn": 1743783322548,
  "format": "text/plain"
}