TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5643 SUBJECT: GRB 060927: Swift/UVOT Optical Observations DATE: 06/09/28 11:14:17 GMT FROM: Samantha Oates at MSSL S.R. Oates (UCL-MSSL), L.M. Barbier (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began observing the field of GRB 0609027 at 14:08:45 on 2006-09-27, 51s after the BAT trigger (Barbier et al., GCN 5627). No new source was detected within the XRT error circle in the V band 10s settling exposure or in coadded images in any filter down to the following 3-sigma magnitude upper limits: Filter Start End Exposure 3-sigma UL ------------------------------------------------------------------- V 51 60 10 18.0 V 175 10273 1302 19.73 B 4197 5829 393 20.93 U 3992 5624 393 20.52 UVW1 3788 11355 561 21.44 UVM2 3583 11177 1279 20.42 UVW2 4606 6182 338 19.84 WHITE 70 6033 491 19.65 ------------------------------------------------------------------- These upper limits are not corrected for Galactic extinction E(B-V) = 0.062.