{
  "bibcode": "2018GCN.22690....1S",
  "body": "M. Stamatikos (OSU), S. D. Barthelmy (GSFC),�� J. R. Cummings (CPI),\nH. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU), T. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry \ndownlink,\nwe report further analysis of BAT GRB 180504A (trigger #830822)\n(Lien, et al., GCN Circ. 22682).�� The BAT ground-calculated position is\nRA, Dec = 331.144, -14.665 deg which is\n ���� RA(J2000)�� =�� 22h 04m 34.7s\n ���� Dec(J2000) = -14d 39' 53.6\"\nwith an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 61%.\n\nThe mask-weighted light curve shows a triangular shaped profile, \nbeginning at\n~T-60 sec, peaking at ~T+20 sec, and decaying by T+80 sec.\nT90 (15-350 keV) is 88.3 +- 44.4 sec (estimated error including \nsystematics).\n\nThe time-averaged spectrum from T-25.03 to T+113.85 sec is best fit by a \nsimple\npower-law model.�� The power law index of the time-averaged spectrum is\n1.50 +- 0.13.�� The fluence in the 15-150 keV band is 2.2 +- 0.2 x \n10^-6erg/cm2.\nThe 1-sec peak photon flux measured from T+16.80 sec in the 15-150 keV band\nis 0.8 +- 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/830822/BA/",
  "circularId": 22690,
  "createdOn": 1525563068000,
  "email": "hans.krimm@nasa.gov",
  "subject": "GRB 180504A: Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NASA-GSFC/NSF  <hans.krimm@nasa.gov>",
  "eventId": "GRB 180504A"
}