{
  "bibcode": "2009GCN..9640....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), D. C. Morris (PSU),\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-239 to T+505 sec from recent telemetry downlinks,\nwe report further analysis of BAT GRB 090709A (trigger #356890)\n(Morris, et al., GCN Circ. 9625).  The BAT ground-calculated position is\nRA, Dec = 289.944, 60.728 deg, which is \n   RA(J2000)  =  19h 19m 46.7s \n   Dec(J2000) = +60d 43' 40.8\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 75%.\n \nThe mask-weighted light curve shows a complex structure.  It starts\nat ~T-80 sec, peaks at T-70 sec, and returns to almost background\nat ~T-20 sec.  Then a series of overlapping peaks starts with the\nbrightest centered at ~T+22 sec.  Then begins an exponential decay\nwith a series of decreases eventually returning to background level\nat ~T+270 sec.  There two more peaks at ~T+330 and ~T+400 sec.  A third peak\nis chopped off while still rising when the source went out of the BAT FOV\nat ~T+490 sec due to the spacecraft slewing because of an observing constraint.\nT90 (15-350 keV) is 89 +- 3 sec (estimated error including systematics).\n \nThe time-averaged spectrum from T-66.7 to T+101.5 sec is well fit by \nsimple power law.  The power law index of the time-averaged spectrum is\n1.22 +- 0.03.  The fluence in the 15-150 keV band is 2.57 +- 0.03 x 10^-5 erg/cm2.\nThe 1-sec peak photon flux measured from T+21.80 sec in the 15-150 keV band\nis 7.8 +- 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/356890/BA/",
  "circularId": 9640,
  "createdOn": 1247179952000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 090709A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 090709A"
}