{
  "bibcode": "2022GCN.32537....1S",
  "body": "M. Stamatikos (OSU), S. D. Barthelmy (GSFC),  H. A. Krimm (NSF),\r\nS. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\r\nK. L. Page (U Leicester), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),\r\nT. Sakamoto (AGU), (i.e. the Swift-BAT team):\r\nUsing the data set from T-240 to T+963 sec from the recent telemetry downlink,\r\nwe report further analysis of BAT GRB 220907A (trigger #1123129)\r\n(Page, et al., GCN Circ.32526).  The BAT ground-calculated position is\r\nRA, Dec = 268.869, -20.303 deg which is\r\n   RA(J2000)  =  17h 55m 28.6s\r\n   Dec(J2000) = -20d 18' 10.8\"\r\nwith an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).\r\nThe partial coding was 90%.\r\nThe mask-weighted light curve shows a single peak of ten seconds approximate\r\nduration starting at T-1 sec.   A spacecraft maneuver took the source out of the BAT\r\nfield of view at approximately 400 seconds.  T90 (15-350 keV) is 8.49 +- 1.56 sec\r\n(estimated error including systematics).\r\nThe time-averaged spectrum from T-0.60 to T+10.29 sec is best fit by a simple\r\npower-law model.  The power law index of the time-averaged spectrum is\r\n0.99 +- 0.24.  The fluence in the 15-150 keV band is 4.1 +- 0.6 x 10^-7 erg/cm2.\r\nThe 1-sec peak photon flux measured from T+0.70 sec in the 15-150 keV band\r\nis 1.0 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence\r\nlevel.\r\n\r\nThe results of the batgrbproduct analysis are available at\r\nhttp://gcn.gsfc.nasa.gov/notices_s/1123129/BA/",
  "circularId": 32537,
  "createdOn": 1662670687000,
  "email": "hkrimm@nsf.gov",
  "subject": "GRB 220907A: Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NSF/NASA-GSFC  <hkrimm@nsf.gov>",
  "eventId": "GRB 220907A"
}