{
  "bibcode": "2018GCN.22616....1K",
  "body": "H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), A. Deich (PSU),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), 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+144 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 180407A (trigger #823001)\n(Deich et al., GCN Circ. 22612). Note that due to the Sun constraint, Swift could\nnot slew to the burst location, and no data were collected for the burst after ~ T+144 s.\nThe BAT ground-calculated position is\nRA, Dec = 35.236, 33.513 deg which is\n  RA(J2000)  =  02h 20m 56.6s\n  Dec(J2000) = +33d 30' 48.4\"\nwith an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 52%.\n\nThe mask-weighted light curve shows a weak pulse that starts at ~ T-20 s and\nends at ~ T+110 s. The pulse consists of several overlapping peaks. The largest\npeak occurs at ~ T+2 s. T90 (15-350 keV) is 95.9 +- 29.8 sec (estimated error including\nsystematics). Note that because the burst went out of the BAT field of view at T+144 s,\nT90 reported here might not capture the entire burst duration.\n\nThe time-averaged spectrum from T-20.58 to T+107.48 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.94 +- 0.20.  The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+2.18 sec in the 15-150 keV band\nis 0.9 +- 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/823001/BA/",
  "circularId": 22616,
  "createdOn": 1523128151000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 180407A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 180407A"
}