GCN Circular 9839
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.