{
  "bibcode": "2013GCN.15635....1U",
  "body": "T. N. Ukwatta (MSU), 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), M. J. Page (UCL-MSSL),\nD. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-240 to T+443 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 131229A (trigger #582374)\n(Page, et al., GCN Circ. 15627).  The BAT ground-calculated position is\nRA, Dec = 85.236, -4.401 deg, which is \n   RA(J2000)  =  05h 40m 56.6s \n   Dec(J2000) = -04d 24' 04.4\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 97%.\n \nThe mask-weighted light curve shows many overlapping peaks\nstarting at ~T-1 sec, peaking at ~T+14 sec, and ending at ~T+17 sec\nwith a long low-level tail exteding out to ~T+430 sec, at which point\nthe BAT data stops due to entering the SAA.  T90 (15-350 keV) is\n13.86 +- 0.43 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T+0.08 to T+27.04 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.02 +- 0.03.  The fluence in the 15-150 keV band is 6.6 +- 0.1 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+13.55 sec in the 15-150 keV band\nis 10.7 +- 0.3 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/582374/BA/",
  "circularId": 15635,
  "createdOn": 1388344546000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 131229A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 131229A"
}