{
  "bibcode": "2018GCN.22561....1M",
  "body": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), H. A. Krimm (NSF/USRA),\nA. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL),\nJ. L. Racusin (NASA/GSFC), T. Sakamoto (AGU),\nM. Stamatikos (OSU), T. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 180329A (trigger #819301)\n(Racusin et al., GCN Circ. 22556).  The BAT ground-calculated position is\nRA, Dec = 329.314, -15.043 deg which is\n  RA(J2000)  =  21h 57m 15.3s\n  Dec(J2000) = -15d 02' 36.0\"\nwith an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 80%.\n\nThe mask-weighted light curve shows a weak pulse that starts at ~T0, peaks\nat ~T+1 s, and ends at ~T+10 s. T90 (15-350 keV) is 9.1 +- 1.8 sec (estimated\nerror including systematics).\n\nThe time-averaged spectrum from T-0.30 to T+9.69 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.39 +- 0.31.  The fluence in the 15-150 keV band is 2.3 +- 0.4 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+1.14 sec in the 15-150 keV band\nis 0.5 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nDue to an observing constraint, there are no observations of this source with the\nSwift XRT or UVOT, and hence no confirmation of the nature of the source.\nHowever, because the image significance from the ground analysis of the BAT\ndata is ~ 9 sigma, and the temporal and spectral properties are consistent with\nthose from a BAT GRB, we conclude that this source is likely a real GRB.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/819301/BA/",
  "circularId": 22561,
  "createdOn": 1522362364000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 180329A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 180329A"
}