GRB 200901A: Swift-BAT refined analysis
Abstract
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200901A (trigger #994143) (Simpson et al., GCN Circ. 28335). The BAT ground-calculated position is RA, Dec = 61.759, -59.901 deg which is RA(J2000) = 04h 07m 02.3s Dec(J2000) = -59d 54' 03.4" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 21%. The mask-weighted light curve shows several overlapping pulses that start at ~T-5 s and end at ~T+27 s. The main peak occurs at ~T0. The burst location went out of the BAT field of view at ~T+514 s. T90 (15-350 keV) is 20.37 +- 7.55 sec (estimated error including systematics). The time-averaged spectrum from T-4.43 to T+26.59 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.72 +- 0.11. The fluence in the 15-150 keV band is 2.9 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.01 sec in the 15-150 keV band is 7.7 +- 0.6 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/994143/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- September 2020
- Bibcode:
- 2020GCN.28344....1S