{
  "bibcode": "2018GCN.23175....1L",
  "body": "A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),  J. R. Cummings (CPI),\nH. A. Krimm (NSF/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Sakamoto (AGU), B. Sbarufatti (PSU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-43 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 180823A (trigger #855434)\n(Sbarufatti, et al., GCN Circ. 23169).  The BAT ground-calculated position is\nRA, Dec = 210.358, 14.901 deg which is \n  RA(J2000)  =  14h 01m 25.9s \n  Dec(J2000) = +14d 54' 03.2\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 92%.\n\nThe available data starts as the burst is rising, but it appears that it includes the\nentire burst.   The mask-weighted light curve shows a double-peaked structure, \nstarting at ~T-43 seconds, with comparably sized peaks at ~T+5 and ~T+20 sec,\nand returning to near background by T+70 seconds, with a fainter tail out past\nT+100 seconds.  A spacecraft slew took the burst location out of the BAT field\nof view around T+450 seconds. T90 (15-350 keV) is 80.3 +- 6.9 sec (estimated \nerror including systematics).\n\nThe time-averaged spectrum from T-37.5 to T+72.0 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.58 +- 0.05.  The fluence in the 15-150 keV band is 7.8 +- 0.2 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+18.33 sec in the 15-150 keV band\nis 2.3 +- 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/855434/BA/",
  "circularId": 23175,
  "createdOn": 1535230613000,
  "email": "hkrimm@nsf.gov",
  "subject": "GRB 180823A, Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NSF/NASA-GSFC  <hkrimm@nsf.gov>",
  "eventId": "GRB 180823A"
}