TITLE: GCN CIRCULAR NUMBER: 12445 SUBJECT: GRB 111016A: Swift-BAT refined analysis DATE: 11/10/17 17:23:05 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), V. Mangano (INAF-IASFPA), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 111016A (trigger #505646) (Mangano, et al., GCN Circ. 12439). The BAT ground-calculated position is RA, Dec = 153.826, 27.474 deg, which is RA(J2000) = 10h 15m 18.2s Dec(J2000) = +27d 28' 26.7" with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 64%. The mask-weighted light curve shows a series of slighlty overlapping peaks starting at ~T-5 sec, peaking at T+58, T+118, T+160, T+210, T+255, then returning to baseline, followed by smaller peaks at T+410, T+540, T+600, and possible peaks at T+700 and T+800. The burst location goes out of the BAT FOV at T+960 sec. T90 (15-350 keV) is 550 +- 105 sec (estimated error including systematics). The time-averaged spectrum from T+35.41 to T+614.48 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.95 +- 0.12. The fluence in the 15-150 keV band is 4.0 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+115.23 sec in the 15-150 keV band is 0.9 +- 0.2 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/505646/BA/