{
  "bibcode": "2018GCN.22584....1U",
  "body": "T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), H. A. Krimm (NSF/USRA),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 180402A (trigger #821103)\n(Lien et al., GCN Circ. 22580).  The BAT ground-calculated position is\nRA, Dec = 251.923, -14.928 deg which is\n  RA(J2000)  =  16h 47m 41.6s\n  Dec(J2000) = -14d 55' 41.6\"\nwith an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 37%.\n\nThe mask-weighted light curve shows a single short pulse that starts\nat ~T0, peaks at ~0.1 s, and ends at ~0.3 s T90 (15-350 keV) is 0.18 +- 0.03 sec\n(estimated error including systematics). The ground analysis confirmed\nthat the additional variation seen in the raw light curve are indeed from\nMAXI J1820+070 (Lien et al., GCN Circ. 22580).\n\nThe time-averaged spectrum from T+0.05 to T+0.26 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n0.52 +- 0.30.  The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.34 sec in the 15-150 keV band\nis 1.8 +- 0.3 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/821103/BA/",
  "circularId": 22584,
  "createdOn": 1522699131000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 180402A, Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 180402A"
}