TITLE: GCN CIRCULAR NUMBER: 11358 SUBJECT: GRB 101020A, Swift-BAT refined analysis DATE: 10/10/21 13:36:55 GMT FROM: Hans Krimm at NASA-GSFC T. Sakamoto (GSFC/UMBC), 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), D. M. Palmer (LANL), G. Sato (ISAS), C. J. Saxton (UCL-MSSL), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of Swift/BAT GRB 101020A (trigger #436737) (Saxton, et al., GCN Circ. 11357). The BAT ground-calculated position is RA, Dec = 189.607, 23.129 deg which is RA(J2000) = 12h 38m 25.8s Dec(J2000) = +23d 07' 44.1" with an uncertainty of 3.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 42%. The mask-weighted light curve shows a very broad peak with no obvious features, extending roughly from T-50 sec to T+150 sec. Most of the emission is below 50 keV. A pre-planned slew took the burst out of the field of view at about T+230 sec. T90 (15-350 keV) is 175.0 +- 28. sec (estimated error including systematics). The time-averaged spectrum from T-50.0 to T+159.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.04 +- 0.17. The fluence in the 15-150 keV band is 2.6 +- 0.3 x 10^-06 erg/cm^2. The 1-sec peak photon flux measured from T+19.00 sec in the 15-150 keV band is 0.5 +- 0.2 ph/cm^2/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/436737/BA/