TITLE: GCN CIRCULAR NUMBER: 28963 SUBJECT: GRB 201128A: Swift-BAT refined analysis DATE: 20/11/29 03:42:15 GMT FROM: Sibasish Laha at GSFC D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 201128A (trigger #1009679) (Lien et al., GCN Circ. 28958). The BAT ground-calculated position is RA, Dec = 223.091, 26.716 deg which is RA(J2000) = 14h 52m 21.9s Dec(J2000) = +26d 42' 58.6" with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 92%. The BAT light curve showed a complex structure with a duration of about 30 sec. T90 (15-350 keV) is 5.41 +- 3.22 sec (estimated error including systematics). The time-averaged spectrum from T-0.44 to T+8.74 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.37 +- 0.37. The fluence in the 15-150 keV band is 2.0 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+4.21 sec in the 15-150 keV band is 0.4 +- 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/1009679/BA/