GRB 210321A: Swift-BAT refined analysis
Abstract
Using the data set from T-240 to T+700 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210321A (trigger #1037828) (Dichiara, et al., GCN Circ. 29677). The BAT ground-calculated position is RA, Dec = 87.887, 70.109 deg which is RA(J2000) = 05h 51m 32.8s Dec(J2000) = +70d 06' 33.4" with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 30%. The mask-weighted light curve shows a single, fairly symmetrical peak from approximately T-8 to T+4 sec. T90 (15-350 keV) is 8.21 +- 0.50 sec (estimated error including systematics). The time-averaged spectrum from T-7.00 to T+1.84 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.15 +- 0.20. The fluence in the 15-150 keV band is 6.7 +- 0.8 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-6.99 sec in the 15-150 keV band is 1.7 +- 0.4 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/1037828/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- March 2021
- Bibcode:
- 2021GCN.29691....1U