TITLE: GCN CIRCULAR NUMBER: 12476 SUBJECT: GRB 111022A: Swift-BAT refined analysis DATE: 11/10/22 20:01:20 GMT FROM: Scott Barthelmy at NASA/GSFC H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), S. Immler (CRESST/GSFC/UMD), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from recent telemetry downlinks, we report further analysis of BAT GRB 111022A (trigger #506070) (Immler, et al., GCN Circ. 12471). The BAT ground-calculated position is RA, Dec = 275.871, -23.666 deg, which is RA(J2000) = 18h 23m 29.1s Dec(J2000) = -23d 39' 58.7" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 66%. The mask-weighted light curve shows two peaks: a small peak starting at ~T-18 sec, peaking at ~T-12 sec, merging into the main peak at ~T-8 sec, peaking at ~T-2 sec, and ending at ~T+15 sec. T90 (15-350 keV) is 24.7 +- 3.6 sec (estimated error including systematics). The time-averaged spectrum from T-17.69 to T+18.57 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.01 +- 0.37, and Epeak of 64.7 +- 13.9 keV (chi squared 63.3 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T-1.46 sec in the 15-150 keV band is 2.5 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.73 +- 0.08 (chi squared 76.5 for 57 d.o.f.). 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/506070/BA/