{
  "bibcode": "2009GCN..9263....1S",
  "body": "G. Sato (ISAS), 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), D. M. Palmer (LANL),\nA. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), 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-240 to T+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 090426 (trigger #350479)\n(Cummings, et al., GCN Circ. 9254).  The BAT ground-calculated position is\nRA, Dec = 189.082, 32.978 deg, which is \n   RA(J2000)  =  12h 36m 19.7s \n   Dec(J2000) = +32d 58' 40.6\" \nwith an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 32%.\n\nThe mask-weighted light curve shows a few overlapping peaks starting \nat ~T-0.1 sec, peaking at T+0.5 sec, and ending at ~T+1.5 sec.\nT90 (15-350 keV) is 1.2 +- 0.3 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T-0.0 to T+1.3 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.93 +- 0.22.  The fluence in the 15-150 keV band is 1.8 +- 0.3 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.03 sec in the 15-150 keV band\nis 2.4 +- 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/350479/BA/",
  "circularId": 9263,
  "createdOn": 1240778416000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 090426: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 090426"
}