{
  "bibcode": "2009GCN..9138....1B",
  "body": "W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),\nE. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),\nV. Mangano (INAF-IASFPA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL),\nT. Sakamoto (GSFC/UMBC), 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+261 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 090417A (trigger #349447)\n(Mangano, et al., GCN Circ. 9133).  The BAT ground-calculated position is\nRA, Dec = 34.993, -7.141 deg which is \n   RA(J2000)  =  02h 19m 58.3s \n   Dec(J2000) = -07d 08' 28.9\" \nwith an uncertainty of 2.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 30%.\n \nThe mask-weighted light curve shows a single peak starting at T-0.06 sec,\npeaking at T+0.04 sec, and ending at T+0.09 sec.  There appears to be\nno extended emmission out to T+55 sec, at which point the burst location\nwent out of the BAT FOV during a planned target slew.  T90 (15-350 keV)\nis 0.072 +- 0.018 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T-0.0 to T+0.1 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index -0.65 +- 2.11, \nand Epeak of 40.3 +- 12.7 keV (chi squared 67.41 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 1.9 +- 0.5 x 10^-8 erg/cm2\nand the 1-sec peak flux measured from T-0.46 sec in the 15-150 keV band is\n3.6 +- 1.0 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 2.99 +- 0.36 (chi squared 77.85 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/349447/BA/",
  "circularId": 9138,
  "createdOn": 1239997847000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 090417A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 090417A"
}