{
  "circularId": 38782,
  "subject": "GRB 250101A: Swift-BAT refined analysis",
  "bibcode": "2025GCN.38782....1K",
  "body": "H. A. Krimm (NSF), S. D. Barthelmy (GSFC), R. Gupta (GSFC), S. Laha\n(GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss\n(GSFC), D. M. Palmer (LANL), K. L. Page (U Leicester), T. Parsotan (GSFC),\nD. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+800 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 250101A (trigger #1278305)\n(Page et al., GCN Circ. 38752).\n\nThe BAT ground-calculated position is\nRA, Dec = 37.057, 19.181 deg which is\n   RA(J2000)  =  02h 28m 13.7s\n   Dec(J2000) = +19d 10' 50.5\"\nwith an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 47%.\n\nThe mask-weighted light curve shows a weak pulse that starts at ~T0, peaks\nat ~T+1 s, and ends at ~T+35 s. T90 (15-350 keV) is 34.19 +- 7.71 sec\n(estimated error including systematics).\n\nThe time-averaged spectrum from T-0.22 to T+36.50 sec is best fit by a\nsimple power-law model.  The power law index of the time-averaged spectrum\nis 2.12 +- 0.24.  The fluence in the 15-150 keV band is 6.3 +- 1.0 x 10^-07\nerg/cm2. The 1-sec peak photon flux measured from T+0.95 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/1278305/\n",
  "createdOn": 1735853922786,
  "submittedHow": "email",
  "submitter": "Amy <yarleen@gmail.com>",
  "eventId": "GRB 250101A"
}