GRB 230423A(trigger #1165354): Swift-BAT refined analysis
Abstract
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we have found that BAT trigger #1165354 is a GRB 230423A even though the original GCN Circular (Brivio et al., GCN Circ. 33677) based on the immediately available data suggested that it was probably a statistical fluctuation. The BAT ground-calculated position is RA, Dec = 122.618, -21.901 deg which is RA(J2000) = 08h 10m 28.2s Dec(J2000) = -21d 54' 03.6" with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The BAT light curve showed a complex structure with a duration of about 30 sec. T90 (15-350 keV) is 23.60 +- 4.27 sec (estimated error including systematics). The time-averaged spectrum from T-2.25 to T+24.49 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.69 +- 0.27. The fluence in the 15-150 keV band is 4.6 +- 0.8 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+10.62 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/1165354/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- April 2023
- Bibcode:
- 2023GCN.33694....1S