GRB 230217A: Swift-BAT refined analysis
Abstract
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 230217A (trigger #1154967) (Moss, et al., GCN Circ. 33339). The BAT ground-calculated position is RA, Dec = 280.759, -28.840 deg which is RA(J2000) = 18h 43m 02.2s Dec(J2000) = -28d 50' 23.0" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 21%. The mask-weighted light curve shows a double-peaked event running from T -0.2 sec to about T+1.2 sec. T90 (15-350 keV) is 1.30 +- 0.45 sec. (estimated error including systematics). The T90 vs. hardness diagram shows the burst well within the short-hard burst region. The time-averaged spectrum from T-0.26 to T+1.75 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.99 +- 0.12. The fluence in the 15-150 keV band is 2.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.24 sec in the 15-150 keV band is 20.2 +- 1.5 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/1154967/BA/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2023
- Bibcode:
- 2023GCN.33363....1B