{
  "subject": "GRB 260127A: Swift-BAT refined analysis",
  "bibcode": "2026GCN.43563....1P",
  "submittedHow": "web",
  "createdOn": 1769721416129,
  "circularId": 43563,
  "eventId": "GRB 260127A",
  "body": "T. Parsotan (GSFC), S. D. Barthelmy (GSFC), \nR. Gupta (GSFC), H. A. Krimm (NSF),\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-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 260127A (trigger #1444088)\n(Kilingler et al., GCN Circ. 43529).  The BAT ground-calculated position is\nRA, Dec = 231.879, 6.758 deg which is \n   RA(J2000)  =  15h 27m 30.9s \n   Dec(J2000) = +06d 45' 28.4\" \nwith an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 40%.\n \nThe classic pulse has a single peak that started around T+20 sec and has a structure before it at ~T+5 sec. The duration of the burst is ~100 sec.  T90 (15-350 keV) is 104.06 +- 19.41 sec (estimated error including systematics).\n \nThe time-averaged spectrum using multiple GTIs  from T-2.68 to T+7.62, T+9.00 to T+84.43 sec, and T+86.00 to T+117.04 sec is best fit by a simple power-law model.  The power law index of the time-averaged spectrum is 1.76 +- 0.15.  The fluence in the 15-150 keV band is 2.3 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+33.36 sec in the 15-150 keV band is 2.1 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence level. \n \nThe results of the batgrbproduct analysis are available at\nhttps://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1444088\n",
  "format": "text/plain",
  "submitter": "D. R. Sadaula at NASA GSFC <dev.r.sadaula@nasa.gov>"
}