GCN Circular 9839
Subject
GRB 090823: Confirmation of Swift-BAT position by BAT Slew Survey
Event
Date
2009-08-25T19:12:25Z (17 years ago)
From
Antonio Copete at Harvard U <acopete@head.cfa.harvard.edu>
A. Copete, J. Grindlay (Harvard)
S. Barthelmy, C. Markwardt, N. Gehrels (NASA/GSFC)
We hereby report confirmation of the Swift-BAT position of GRB 090823
reported by Cummings et al. (GCN 9835, 9838), from an independent
analysis of the BAT event-mode data done by the BAT Slew Survey
(BATSS), in the slew that started at 16:10:02 UT and lasted 178 sec.
The BATSS-calculated position is RA, Dec = 128.671, +60.641 deg, which
is:
RA (J2000) = 08h 34m 41s
Dec(J2000) = +60d 38' 29"
with an uncertainty of 4.51 arcmin (90% confidence, including
systematics). The burst was detected with a significance of 6.2 sigma
and 6.7 sigma from imaging in the 15-50 keV and 15-150 keV energy
bands, respectively. Consistent with the report in GCN 9835, the
lightcurve in the slew data only spans a 15-sec trailing edge of the
prompt emission of the burst before it fades into the background.