TITLE: GCN CIRCULAR NUMBER: 23081 SUBJECT: GRB 180805A: Swift-BAT refined analysis DATE: 18/08/06 01:48:56 GMT FROM: Amy Lien at GSFC D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. D'Avanzo (INAF-OAB), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), J. P. Norris (BSU), 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 BAT GRB 180805A (trigger #851829) (D'Avanzo et al., GCN Circ. 23074). The BAT ground-calculated position is RA, Dec = 167.575, -45.327 deg which is RA(J2000) = 11h 10m 18.1s Dec(J2000) = -45d 19' 35.8" with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 64%. The mask-weighted light curve shows a single-pulse structure that starts at peaks at ~T0, and ends at ~T+1.9 s. T90 (15-350 keV) is 1.68 +- 0.41 sec (estimated error including systematics). The time-averaged spectrum from T+0.04 to T+1.90 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.58 +- 0.32. The fluence in the 15-150 keV band is 1.1 +- 0.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.13 sec in the 15-150 keV band is 1.1 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. Both the temporal and spectral properties of this burst lie in the intermediate region between short and long GRBs. The lag analysis is unavailable due to the weakness of this burst. No extended emission is found. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/851829/BA/