{
  "bibcode": "2015GCN.18110....1B",
  "body": "S. D. Barthelmy (GSFC),  J. R. Cummings (CPI), N. Gehrels (GSFC),\nH. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL)\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 150801B (trigger #650977) (Sbarufatti,\net al., GCN Circ. 18104).  The BAT ground-calculated position is\nRA, Dec = 82.961, -5.374 deg which is\n    RA(J2000)  =  05h 31m 50.7s\n    Dec(J2000) = -05d 22' 28.0\"\nwith an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 62%.\n  \nThe mask-weighted light curve shows two widely separated episodes.  The first\nepisode was about 40 seconds long starting at about T-20 seconds.  There were two\nprominent overlapping FRED peaks at T0 and T+10 seconds, followed by a return to\nbackground level.  The second episode became detectable in BAT at about T+330\nseconds and returned to background about T+450 seconds.  There were two smaller\ncusp-shaped peaks at T+370 and T+390 seconds, about 10 and 7 seconds long.  The\npeaks between 330 and 450 seconds are at the same time as bright X-ray flares\ndetected by XRT.  T90 (15-350 keV) was 426 +- 30 sec (estimated error including\nsystematics).\n  \nThe time-averaged spectrum from T-30.16 to T+433.94 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.84 +- 0.14.  The fluence in the 15-150 keV band is 3.1 +- 0.2 x 10^-06 erg/cm2.\nThe 1-sec peak photon flux measured from T+9.32 sec in the 15-150 keV band\nis 2.5 +- 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/650977/BA/",
  "circularId": 18110,
  "createdOn": 1438544840000,
  "email": "james.r.cummings@nasa.gov",
  "subject": "GRB 150801B: Swift-BAT refined analysis",
  "submitter": "Jay R. Cummings at NASA/GSFC/Swift  <james.r.cummings@nasa.gov>",
  "eventId": "GRB 150801B"
}