TITLE: GCN CIRCULAR NUMBER: 22393 SUBJECT: GRB 180205A: Swift-BAT refined analysis DATE: 18/02/06 02:57:19 GMT FROM: Amy Lien at GSFC H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. A. Evans (U Leicester), 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-240 to T+700 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180205A (trigger #808625) (Evans et al., GCN Circ. 22381). The BAT ground-calculated position is RA, Dec = 126.819, 11.536 deg which is RA(J2000) = 08h 27m 16.5s Dec(J2000) = +11d 32' 11.1" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%. The mask-weighted light curve shows a multi-peaked structure that starts at ~T-7 s and ends at ~T+11 s. The two major peaks occur at ~T-5 s and ~T0 s, respectively. T90 (15-350 keV) is 15.5 +- 3.1 sec (estimated error including systematics). The time-averaged spectrum from T-7.04 to T+10.87 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.04 +- 0.13. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.20 sec in the 15-150 keV band is 3.4 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/808625/BA/