GRB 231111A: Swift-BAT refined analysis
Abstract
Using the data set from T-239 to T+200 sec from the recent telemetry downlink, we report further analysis of BAT GRB 231111A (trigger #1195887) (Melandri, et al., GCN Circ. 34981). The BAT ground-calculated position is RA, Dec = 290.197, 52.440 deg which is RA(J2000) = 19h 20m 47.3s Dec(J2000) = +52d 26' 22.9" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 61%. The BAT light curve shows a FRED-pulse structure peaking ~0 seconds after the trigger time. T90 (15-350 keV) is 34.08 +- 4.88 sec (estimated error including systematics). The time-averaged spectrum from T-5.32 to T+40.06 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.58 +- 0.07. The fluence in the 15-150 keV band is 3.4 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+0.07 sec in the 15-150 keV band is 2.7 +- 0.3 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/1195887/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- November 2023
- Bibcode:
- 2023GCN.35033....1L