TITLE: GCN CIRCULAR NUMBER: 8208 SUBJECT: GRB080905A: Swift/UVOT Upper Limits DATE: 08/09/10 13:18:20 GMT FROM: Peter Brown at PSU P. J. Brown and C. Pagani (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT observed the field of GRB 080905A starting about 114 s after the BAT detection (Pagani et al., GCN Circ. 8180). We do not detect any source in the revised XRT error circle (Evans et al., GCN Circ. 8203) including the faint optical afterglow seen by Malesani et al. (GCN Circ. 8190) in any of the UVOT filters down to the following 3 sigma upper limits (where T_start and T_stop represent the elapsed time since the BAT trigger in seconds). Filter T_start(s) T_stop Exp(s) MagLimit white 114 970 198 >21.3 uvw2 730 750 19 >18.1 uvm2 626 4520 95 >19.2 uvw1 651 825 39 >18.8 u 675 850 39 >19.2 b 700 865 15 >18.9 v 220 1250 1014 >20.6 The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E(B-V) = 0.14 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).