TITLE: GCN CIRCULAR NUMBER: 8158 SUBJECT: GRB080825B: Swift/UVOT Upper Limits DATE: 08/08/29 01:10:54 GMT FROM: Peter Brown at PSU P. J. Brown (PSU) reports on behalf of the Swift/UVOT team: The Swift/UVOT observed the field of GRB 080825B starting about 45 ks after the SuperAGILE detection (Evangelista et al., GCN Circ. 8133). We do not detect the optical afterglow seen by Thoene et al. (GCN Circ. 8135) in any of the UVOT filters down to the following 3 sigma upper limits. Filter T_start(s) T_stop Exp(s) MagLimit white 49916 50823 885 >22.1 uvw2 44237 78448 1903 >21.5 uvm2 61477 67242 988 >20.8 uvw1 67248 73020 1036 >20.9 u 73027 73522 483 >20.8 b 49004 49911 885 >21.2 v 45144 61472 1234 >20.5 The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E(B-V) ~ 0.25 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383,627).