TITLE: GCN CIRCULAR NUMBER: 10658 SUBJECT: GRB 100423A: Swift-BAT refined analysis DATE: 10/04/23 11:45:41 GMT FROM: Scott Barthelmy at NASA/GSFC J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), M. C. Stroh (PSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100423A (trigger #420247) (Stroh, et al., GCN Circ. 10651). The BAT ground-calculated position is RA, Dec = 136.471, 21.487 deg, which is RA(J2000) = 09h 05m 53.0s Dec(J2000) = +21d 29' 13.4" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 74%. The mask-weighted light curve shows a couple small peaks starting at ~T-4 sec, then a large peak at T_zero and peaking at ~T+0.1 sec, and then a long roughly exponential decay out to T+160 where the burst went out of the BAT FOV due a slew to avoid an observing constraint. We cannot quote a T90, because there was still burst emission when it went out of the FOV. The time-averaged spectrum from T-12.9 to T+99.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.07 +- 0.05. The fluence in the 15-150 keV band is 8.5 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+10.60 sec in the 15-150 keV band is 1.2 +- 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/420247/BA/