GRB 210517A: Swift-BAT refined analysis
Abstract
Using the data set from T-240 to T+659 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210517A (trigger #1048783) (D'Elia, et al., GCN Circ. 30032). The BAT ground-calculated position is RA, Dec = 358.190, -39.104 deg which is RA(J2000) = 23h 52m 45.5s Dec(J2000) = -39d 06' 15.0" with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 78%. The mask-weighted light curve shows a single peak of three-second duration near the trigger time. T90 (15-350 keV) is 3.06 +- 1.4 sec (estimated error including systematics). The time-averaged spectrum from T-0.17 to T+3.13 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.85 +- 0.25. The fluence in the 15-150 keV band is 1.5 +- 0.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.18 sec in the 15-150 keV band is 1.5 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The position of this burst on the BAT T90-Hardness diagram suggests that it is a long GRB. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1048783/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- May 2021
- Bibcode:
- 2021GCN.30043....1S