GRB 210209A: Swift-BAT refined analysis
Abstract
Using the data set from T-239 to T+800 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210209A (trigger #1031636) (Laha, et al., GCN Circ. 29442). The BAT ground-calculated position is RA, Dec = 328.097, 43.545 deg which is RA(J2000) = 21h 52m 23.3s Dec(J2000) = +43d 32' 40.4" with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%. The mask-weighted light curve shows a double-peaked structure running from roughly T-35 sec to T+140 seconds. The two peaks were at T+3 sec and T+65 sec. T90 (15-350 keV) is 139.4 +- 21.5 sec (estimated error including systematics). The time-averaged spectrum from T-40.34 to T+134.72 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.52 +- 0.12. The fluence in the 15-150 keV band is 2.4 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.68 sec in the 15-150 keV band is 0.6 +- 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/1031636/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2021
- Bibcode:
- 2021GCN.29479....1L