{
  "bibcode": "2020GCN.27839....1B",
  "body": "S. D. Barthelmy (GSFC), E. Ambrosi (INAF-IASFPA), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-61 to T+242 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 200528A (trigger #974827)\n(Ambrosi, et al., GCN Circ. 27832).  The BAT ground-calculated position is\nRA, Dec = 176.637, 58.185 deg which is \n  RA(J2000)  =  11h 46m 32.8s \n  Dec(J2000) = +58d 11' 07.3\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 62%.\n\nThe mask-weighted light curve shows a multi-peaked structure rising just before T0,\npeaking around T+35 sec and decaying to background by T+120 sec.\nT90 (15-350 keV) is 58.7 +- 1.4 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-1.02 to T+112.88 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 1.62 +- 0.14, \nand Epeak of 40.1 +- 5.5 keV (chi squared 25.28 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 1.8 +- 0.0 x 10^-5 erg/cm2\nand the 1-sec peak flux measured from T+33.82 sec in the 15-150 keV band is\n17.5 +- 0.5 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 2.14 +- 0.03 (chi squared 69.65 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/974827/BA/",
  "circularId": 27839,
  "createdOn": 1590702322000,
  "email": "hkrimm@nsf.gov",
  "subject": "GRB 200528A: Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NSF/NASA-GSFC  <hkrimm@nsf.gov>",
  "eventId": "GRB 200528A"
}