TITLE: GCN CIRCULAR NUMBER: 9966 SUBJECT: GRB 090929A BAT location of the Fermi GBM burst DATE: 09/09/29 14:15:48 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (GSFC/UMBC) and H. Krimm (GSFC/USRA) on behalf of the Swift team The Fermi-GBM burst GRB 090929A (Rau, GCN Circular# 9962) occurred during a preplanned Swift slew maneuver. A strong source was found in a mosaic of images from BAT event data, which is often collected during slews. The source location was RA, Dec = 56.494, -5.952 or RA (J2000) 03h 45m 57.9s Dec (J2000) -05d 57' 50" with an estimated 90% containment error radius of 3 arcmin. The partial coding was 73-90% during the burst. We define the trigger time as 04:33:08 UTC. As seen in BAT, the burst had three progressively weaker peaks, at T+1, T+4, and T+8. The peak count rate (15-350 keV) was ~18000 counts/sec at T+2 sec. T90 was about 10 seconds. A Swift TOO has been requested and approved.