{
  "bibcode": "2013GCN.15613....1S",
  "body": "M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nJ. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),\nA. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), S. R. Oates (UCL-MSSL),\nD. M. Palmer (LANL), T. Sakamoto (AGU), J. Tueller (GSFC),\nT. N. Ukwatta (MSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+481 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 131226A (trigger #582123)\n(Oates, et al., GCN Circ. 15612).  The BAT ground-calculated position is\nRA, Dec = 301.309, -64.943 deg which is\n    RA(J2000)  =  20h 05m 14.2s\n    Dec(J2000) = -64d 56' 35.2\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 56%.\n\nThe mask-weighted light curve shows a very complex structure with more than a \ndozen peaks covering the time period from T-0.5 sec to T+8.5 sec and peaking at \nT+1 sec.  This is followed by lower-level extended emission out to ~T+180 sec. \nT90 (15-350 keV) is 7.20 +- 0.16 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.26 to T+8.42 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.38 +- 0.04.  The fluence in the 15-150 keV band is 4.0 +- 0.1 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+1.11 sec in the 15-150 keV band\nis 10.4 +- 0.4 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/582123/BA/",
  "circularId": 15613,
  "createdOn": 1388064630000,
  "email": "hans.a.krimm@nasa.gov",
  "subject": "GRB 131226A, Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NASA-GSFC  <hans.a.krimm@nasa.gov>",
  "eventId": "GRB 131226A"
}