{
  "bibcode": "2020GCN.28484....1S",
  "body": "T. Sakamoto (AGU), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), M. J. Moss (GWU),\nD. M. Palmer (LANL), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+871 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 200922A (trigger #997024)\n(Moss et al., GCN Circ. 28471).  The BAT ground-calculated position is\nRA, Dec = 296.954, -55.199 deg which is\n   RA(J2000)  =  19h 47m 49.0s\n   Dec(J2000) = -55d 11' 55.1\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 74%.\n\nThe mask-weighted light curve shows a single FRED-like pulse that\nstarts at ~T-2 s, peaks at ~T+0, and ends at ~T+16 s.\nT90 (15-350 keV) is 10.30 +- 1.96 sec (estimated error including\nsystematics).\n\nThe time-averaged spectrum from T-1.91 to T+16.22 sec is best fit\nby a power law with an exponential cutoff.  This fit gives a photon\nindex 1.43 +- 0.26, and Epeak of 39.3 +- 5.7 keV (chi squared 52.48\nfor 56 d.o.f.).  For this model the total fluence in the 15-150 keV\nband is 2.8 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured\nfrom T-0.46 sec in the 15-150 keV band is 11.4 +- 0.5 ph/cm2/sec.\nA fit to a simple power law gives a photon index of 2.12 +- 0.06\n(chi squared 76.50 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/997024/BA/",
  "circularId": 28484,
  "createdOn": 1600872467000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 200922A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 200922A"
}