GRB 191004A: Swift-BAT refined analysis
Abstract
Using the data set from T-61 to T+242 sec from recent telemetry downlinks, we report further analysis of BAT GRB 191004A (trigger #927825) (Cenko, et al., GCN Circ. 25945). The BAT ground-calculated position is RA, Dec = 31.716, -36.932 deg, which is RA(J2000) = 02h 06m 51.8s Dec(J2000) = -36d 55' 54.0" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 26%. The mask-weighted light curve has two overlapping peaks starting at ~T-0.2 sec, peaking at ~T_zero, and ending at ~3.1 sec. T90 (15-350 keV) is 2.44 +- 0.08 sec (estimated error including systematics). The time-averaged spectrum from T-0.09 to T+2.58 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.35 +- 0.08. The fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.09 sec in the 15-150 keV band is 7.8 +- 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/927825/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- October 2019
- Bibcode:
- 2019GCN.25953....1S