GCN Circular 5685
Subject
GRB 060928: RHESSI Spectral Fit
Date
2006-10-03T02:25:07Z (18 years ago)
From
Eric Bellm at UCB/SSL <ebellm@ssl.berkeley.edu>
E. Bellm, M. Bandstra, S. Boggs, C. Wigger, W. Hajdas,
D. M. Smith, and K. Hurley on behalf of the RHESSI team report:
As observed by RHESSI, GRB060928 (Hurley et al., GCN 5684) displayed two
periods of emission. The first had a duration of ~14s starting at about
T0 = 01:17:05 UT. The preliminary fit to the time-integrated RHESSI
spectrum from T0 - T0+14s between 500 keV and 10 MeV is simple power law with
alpha = -2.21 +0.85/-1.74
(90% confidence levels).
The 500 keV-10 MeV fluence is 1.5 E-5 erg/cm^2.
The second outburst began at T1 = 01:20:05 UT and had a duration of ~25s.
A spectral fit to the time-integrated RHESSI spectrum
from T1 - T1+25s between 30 keV and 10 MeV gives a cutoff power law with
alpha = -1.36 +0.05/-0.04
E0 = 2090 +480/-370 keV
Epeak = 1340 +/- 220 keV
The 30 keV-10 MeV fluence is 2.43 +/- 0.91 E-4 erg/cm^2.