GCN Circular 5595
Subject
GRB 060923B, Swift-BAT refined analysis
Event
Date
2006-09-23T16:16:00Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL),
A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS),
M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC)
on behalf of the Swift-BAT team:
Using the data set from T-240 to T+754 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 060923B (trigger #230702)
(Stamitikos, et al., GCN Circ. 5590). The BAT ground-calculated position
is RA,Dec = 238.193, -30.907 deg {15h 52m 46.3s, -30d 54' 25.8"} (J2000)
+- 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 36%.
The mask-weighted lightcurve has a single peak starting at T-1 sec
and ending at T+10 sec. T90 (15-350 keV) is 8.8 +- 0.1 sec
(estimated error including systematics).
The time-averaged spectrum from T-0.1 to T+9.9 is best fit by a simple
power-law model. The power law index of the time-averaged spectrum
is 2.53 +- 0.25. The fluence in the 15-150 keV band is 4.8 +- 0.6 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+4.93 sec in the 15-150 keV band
is 1.5 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90%
confidence level.