{
  "circularId": 45834,
  "createdOn": 1791378300612,
  "eventId": "GRB 261005B",
  "subject": "GRB 261005B: Swift-BAT refined analysis",
  "submittedHow": "email",
  "body": "S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha\n(GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss\n(GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T.\nSakamoto (AGU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-179 to T+200 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 261005B (trigger #1515414)\n(Parsotan et al., GCN Circ. 45812).  The BAT ground-calculated position is\nRA, Dec = 255.322, 1.584 deg which is\n   RA(J2000)  =  17h 01m 17.3s\n   Dec(J2000) = +01d 35' 02.3\"\nwith an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The\npartial coding was 93%.\n\nThe mask-weighted light curve shows a multi-peaked structure that starts at\n~T0 and ends at ~T+100 s. The two main peaks occur at ~T+4 s and ~T+21 s,\nrespectively. T90 (15-350 keV) is 94.00 +- 20.10 sec (estimated error\nincluding systematics).\n\nThe time-averaged spectrum from T+1.78 to T+106.78 sec is best fit by a\nsimple power-law model.  The power law index of the time-averaged spectrum\nis 1.37 +- 0.27.  The fluence in the 15-150 keV band is 7.9 +- 1.3 x 10^-07\nerg/cm2. The 1-sec peak photon flux measured from T+3.78 sec in the 15-150\nkeV band is 0.7 +- 0.1 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/1515414\n",
  "submitter": "Amy <yarleen@gmail.com>"
}