{
  "bibcode": "2012GCN.12799....1M",
  "body": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nJ. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC),\nH. A. Krimm (GSFC/USRA), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL),\nT. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU),\nJ. Tueller (GSFC), T. N. Ukwatta (MSU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-240 to T+962 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 120102A (trigger #510922)\n(Marshall, et al., GCN Circ. 12794).  The BAT ground-calculated position is\nRA, Dec = 276.224, 24.713 deg, which is \n   RA(J2000)  =  18h 24m 53.8s \n   Dec(J2000) = +24d 42' 46.7\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 78%.\n \nThe mask-weighted light curve shows a weak peak starting at ~T_0 and returning\nto baseline at ~T+20 sec.  The main emission starts at ~T+25 sec with 2, or\npossibly 3, overlapping peaks, with the peak emission at ~T+33 sec,\nwhich then approximately exponentially decays out to 510 sec or possibly\nout to ~750 sec.  At the 3- or 4-sigma level, there is a possible precursor\npeak at ~T-70 sec with a duration of 10-20 sec.  T90 (15-350 keV) is\n38.7 +- 3.5 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T+0.77 to T+53.94 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.59 +- 0.05.  The fluence in the 15-150 keV band is 4.3 +- 0.1 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+32.75 sec in the 15-150 keV band\nis 10.3 +- 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/510922/BA/",
  "circularId": 12799,
  "createdOn": 1325517859000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 120102A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 120102A"
}