{
  "bibcode": "2013GCN.15202....1C",
  "body": "J. R. Cummings (GSFC/UMBC),S. D. Barthelmy (GSFC), N. Gehrels (GSFC),\nH. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC),\nM. J. Page (UCL-MSSL),D. M. Palmer (LANL),T. Sakamoto (AGU),\nM. Stamatikos (OSU),J. Tueller (GSFC),T. N. Ukwatta (MSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-60 to T+243 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 130907A (trigger #569992)\n(Page, et al., GCN Circ. 15183).  The BAT ground-calculated position is\nRA, Dec = 215.898, 45.602 deg which is\n    RA(J2000)  =  14h 23m 35.5s\n    Dec(J2000) = +45d 36' 08.0\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n\nThe mask-weighted light curve shows a very complicated structure with six main\npeaks from T-55 sec to T+95 sec.  Each of these peaks shows several sub-peaks.\nThe strongest peak is at ~T+57 sec.  After T+95 sec, the count rate drops\nsignificantly, but doesn't return all the way to the background level.  Then\nthere is another weak, soft peak from T+210 sec to T+240 sec. This late peak\nis coincident with the start of a long flare seen in the XRT. There may be\nfurther BAT emission beyond the end of the currently available event data.\nT90 (15-350 keV) is 115.14 +- 0.67 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-50.7 to T+234.6 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.11 +- 0.02.  The fluence in the 15-150 keV band is 1.2 +- 0.0 x 10^-4 erg/cm2.\nThe 1-sec peak photon flux measured from T+57.66 sec in the 15-150 keV band\nis 25.6 +- 0.5 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/569992/BA/",
  "circularId": 15202,
  "createdOn": 1378690556000,
  "email": "hans.a.krimm@nasa.gov",
  "subject": "GRB 130907A, Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NASA-GSFC  <hans.a.krimm@nasa.gov>",
  "eventId": "GRB 130907A"
}