{
  "eventId": "GRB 250814A",
  "bibcode": "2025GCN.41396....1K",
  "circularId": 41396,
  "createdOn": 1755292264104,
  "submittedHow": "email",
  "subject": "GRB 250814A: Swift-BAT refined analysis",
  "submitter": "Amy <yarleen@gmail.com>",
  "body": "H. A. Krimm (NSF), S. D. Barthelmy (GSFC), R. Caputo (GSFC), R. Gupta\n(GSFC), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nM. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula\n(GSFC/UMBC), T. Sakamoto (AGU) (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 250814A (trigger #1342439)\n(Caputo et al., GCN Circ. 41358).  The BAT ground-calculated position is\nRA, Dec = 306.313, 48.406 deg which is\n   RA(J2000)  =  20h 25m 15.2s\n   Dec(J2000) = +48d 24' 23.1\"\nwith an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 54%.\n\nThe mask-weighted light curve shows a single-pulse structure that starts at\n~T0 and peaks at ~T+10 s. The main pulse ends at ~T+25 s, but there is some\nweak emission that lasts till ~T+100 s. T90 (15-350 keV) is 110.11 +- 47.90\nsec (estimated error including systematics).\n\nThe time-averaged spectrum from T+1.06 to T+125.36 sec is best fit by a\nsimple power-law model.  The power law index of the time-averaged spectrum\nis 1.91 +- 0.21.  The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-06\nerg/cm2. The 1-sec peak photon flux measured from T+10.22 sec in the 15-150\nkeV band is 0.8 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90%\nconfidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttps://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1342439\n"
}