TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4303 SUBJECT: GRB051117b: No Swift/UVOT Detection DATE: 05/11/24 15:11:02 GMT FROM: Tracey Poole at MSSL T. S. Poole (UCL-MSSL), S. T. Holland (GSFC), D. Band (GSFC), P. Boyd (GSFC-UMBC) & J. Nousek (PSU) on behalf of the Swift/UVOT team report: The Swift-Ultra-Violet/Optical Telescope (UVOT) began observing the field of GRB 051117b (BAT Trigger=164279; Band et. al. GCN 4281) at 2005-11-17 13:22:54 UT, 133 seconds after the burst. No new source is detected within the 4 arcsec radius XRT error circle at position RA=5h 40m 43s, Dec=-19d 16' 26.2" (Beardmore et. al. GCN 4282) in any of the UVOT filters down to the following co-added 5 sigma magnitude upper limits: Filter T_range (sec) Exp (sec) 5-sigma V 133-24975 5236 20.53 B 499-1608 199 19.59 U 445-7019 311 19.66 UVW1 391-366901 1099 21.00 UVM2 277-5993 1110 21.08 UVW2 608-1713 2340 23.24 WHITE 553-982 100 19.49 Where T_range is time post-trigger, and T_exp is the exposure time of the observation. A 6 arcsec aperture was used for all filters. These values are not corrected for Galactic extinction. This message may be cited.