TITLE: GCN CIRCULAR NUMBER: 21385 SUBJECT: Swift J181723.1-164300: Swift-BAT refined analysis DATE: 17/07/29 20:08:51 GMT FROM: Amy Lien at GSFC S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of Swift J181723.1-164300 (trigger #765081) (Barthelmy et al., GCN Circ. 21369). The BAT ground-calculated position is RA, Dec = 274.360, -16.721 deg which is RA(J2000) = 18h 17m 26.5s Dec(J2000) = -16d 43' 16.5" with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 88%. The mask-weighted light curve shows a single pulse that starts at ~T-5 s, peaks at ~T0, and ends at ~T+5 s. T90 (15-350 keV) is 9.34 +- 1.07 sec (estimated error including systematics). The spectral fit of the time-averaged spectrum from T-4.44 to T+5.45 sec using a simple power-law model gives a power law index of 4.70 +- 0.74. The fluence in the 15-150 keV band is 1.1 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.82 sec in the 15-150 keV band is 0.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The power-law index is much softer than any BAT-detected GRBs (Lien & Sakamoto et al. 2016), we thus conclude that this is a Galactic source and not a GRB. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/765081/BA/