{
  "bibcode": "2008GCN..8539....1S",
  "body": "T. Sakamoto (GSFC/UMBC), 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), C. B. Markwardt (GSFC/UMD), S. R. Oates (UCL-MSSL),\nD. M. Palmer (LANL), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU),\nJ. Tueller (GSFC), T. N. Ukwatta (GWU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-119 to T+271 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 081121 (trigger #335105)\n(Oates, et al., GCN Circ. 8537).  The BAT ground-calculated position is\nRA, Dec = 89.282, -60.612 deg, which is \n   RA(J2000)  =  05h 57m 07.7s \n   Dec(J2000) = -60d 36' 42.1\" \nwith an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 5%.\n \nThe mask-weighted light curve shows an approximately square-shaped pulse\nwith a trailing spike.  The pulse starts at ~T-10 sec and ends at ~T=15 sec.\nThere is a hint of low-level precursor emission starting before T-119 sec\n(the beginning of the saved event-by-event data).\nT90 (15-350 keV) is 14 +- 2 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T-2.8 to T+12.9 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 0.43 +- 0.54, \nand Epeak of 123 +- 69 keV (chi squared 44.9 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 4.1 +- 0.3 x 10^-6 erg/cm2\nand the 1-sec peak flux measured from T+6.94 sec in the 15-150 keV band is\n4.4 +- 1.0 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 1.21 +- 0.12 (chi squared 52.0 for 57 d.o.f.).  All the quoted errors\nare at the 90% confidence level. \n \nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/335105/BA/",
  "circularId": 8539,
  "createdOn": 1227312550000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 081121: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 081121"
}