GRB 190824A, Swift-BAT refined analysis

Using the data set from T-230 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190824A (trigger #922107) (D'Elia, et al., GCN Circ. 25463). The BAT ground-calculated position is RA, Dec = 215.323, -41.900 deg which is RA(J2000) = 14h 21m 17.6s Dec(J2000) = -41d 53' 59.5" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 28%. The mask-weighted light curve shows three main peaks, each with underlying substructure. The first peak is from ~T-80 sec to T-60 sec. The second, largest, peak is from ~T-10 sec to T+50 sec, and the third peak is from ~T+85 sec to T+110 sec. T90 (15-350 keV) is 169.4 +- 5.9 sec (estimated error including systematics). The time-averaged spectrum from T-71.9 to T+114.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.62 +- 0.08. The fluence in the 15-150 keV band is 8.5 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.12 sec in the 15-150 keV band is 5.0 +- 0.5 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/922107/BA/