{
  "bibcode": "2012GCN.12889....1B",
  "body": "S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),\nE. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),\nC. B. Markwardt (GSFC), K. L. Page (U Leicester), 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-239 to T+963 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 120121A (trigger #512164)\n(Page, et al., GCN Circ. 12885).  The BAT ground-calculated position is\nRA, Dec = 249.363, -23.963 deg which is \n   RA(J2000)  =  16h 37m 27.1s \n   Dec(J2000) = -23d 57' 45.9\" \nwith an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 70%.\n \nThe mask-weighted light curve shows several overlapping peaks starting at\n~T-10 sec, peaking at ~T+2 sec, and ending at ~T+70 sec.\nT90 (15-350 keV) is 26.1 +- 3.1 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T-11.00 to T+18.33 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.23 +- 0.13.  The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+2.86 sec in the 15-150 keV band\nis 0.7 +- 0.2 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/512164/BA/",
  "circularId": 12889,
  "createdOn": 1327168781000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 120121A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 120121A"
}