GRB 211024B: 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 211024B (trigger #1081073) (Gropp, et al., GCN Circ. 30980). The BAT ground-calculated position is RA, Dec = 154.708, 24.566 deg which is RA(J2000) = 10h 18m 49.9s Dec(J2000) = +24d 33' 57.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows three episodes. The first episode starts from T-60 s, peaks at T+10 s and ends at T+100 s. The second, and weakest, episode runs from T+250 to T+400 sec and the third episode starts around T+500 s, peaks at T+580 s and ends at T+620 s. The burst came into the BAT field of view around T-100 sec during a pre-planned slew. T90 (15-350 keV) is 603.5 +- 20.7 sec (estimated error including systematics). The time-averaged spectrum from T-56.37 to T+613.08 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.63 +- 0.09. The fluence in the 15-150 keV band is 6.8 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+5.17 sec in the 15-150 keV band is 0.9 +- 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/1081073/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- October 2021
- Bibcode:
- 2021GCN.30989....1L