{
  "bibcode": "2017GCN.21385....1B",
  "body": "S. D. Barthelmy (GSFC), J. R. Cummings (CPI),\nH. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Sakamoto (AGU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (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 Swift J181723.1-164300 (trigger #765081)\n(Barthelmy et al., GCN Circ. 21369).  The BAT ground-calculated position is\nRA, Dec = 274.360, -16.721 deg which is\n  RA(J2000)  =  18h 17m 26.5s\n  Dec(J2000) = -16d 43' 16.5\"\nwith an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 88%.\n\nThe mask-weighted light curve shows a single pulse that starts at ~T-5 s,\npeaks at ~T0, and ends at ~T+5 s. T90 (15-350 keV) is 9.34 +- 1.07 sec\n(estimated error including systematics).\n\nThe spectral fit of the time-averaged spectrum from T-4.44 to T+5.45 sec\nusing a simple power-law model gives a power law index of 4.70 +- 0.74.\nThe fluence in the 15-150 keV band is 1.1 +- 0.2 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.82 sec in the 15-150 keV band\nis 0.6 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nThe power-law index is much softer than any BAT-detected GRBs\n(Lien & Sakamoto et al. 2016), we thus conclude that this is a Galactic source\nand not a GRB.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/765081/BA/",
  "circularId": 21385,
  "createdOn": 1501358931000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "Swift J181723.1-164300: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>"
}