TITLE: GCN CIRCULAR NUMBER: 22006 SUBJECT: GRB 171011A: Swift-BAT refined analysis DATE: 17/10/12 14:47:20 GMT FROM: Amy Lien at GSFC J. R. Cummings (CPI), S. D. Barthelmy (GSFC), J.D. Gropp (PSU), 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-119 to T+54 sec from the recent telemetry downlink, we report further analysis of BAT GRB 171011A (trigger #778154) (Gropp et al., GCN Circ. 21993). The BAT ground-calculated position is RA, Dec = 236.766, -10.064 deg which is RA(J2000) = 15h 47m 03.7s Dec(J2000) = -10d 03' 50.2" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 63%. The mask-weighted light curve shows a single-peaked light curve that starts and peaks at ~ T0, and ends at ~ T+3 s. T90 (15-350 keV) is 2.27 +- 0.24 sec (estimated error including systematics). The time-averaged spectrum from T-0.06 to T+2.74 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.68 +- 0.08. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.08 sec in the 15-150 keV band is 7.0 +- 0.4 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/778154/BA/