GRB 210725A: 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 210725A (trigger #1061511) (Bernardini et al., GCN Circ. 30501). The BAT ground-calculated position is RA, Dec = 215.381, -1.177 deg which is RA(J2000) = 14h 21m 31.4s Dec(J2000) = -01d 10' 37.2" with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 92%. The mask-weighted light curve shows a multi-peaked structure that starts at ~T0 and ends at ~T+60 s. The main peak occurs at ~T+1 s. T90 (15-350 keV) is 53.54 +- 11.25 sec (estimated error including systematics). The time-averaged spectrum from T-0.82 to T+59.86 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.42 +- 0.32. The fluence in the 15-150 keV band is 8.1 +- 1.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+1.01 sec in the 15-150 keV band is 1.0 +- 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/1061511/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- July 2021
- Bibcode:
- 2021GCN.30514....1L