GCN Circular 5445
A. Cucchiara, P. Brown, A. Moretti report on behalf of the Swift/UVOT team: The Swift UVOT began observing GRB 060813 (trigger #224364, A. Moretti et al., GCN Circ. 5442) 83 seconds after the BAT trigger. No optical afterglow is detected in the XRT refined error circle (A. Moretti et al., GCN Circ. 5444). The 3-sigma limiting magnitudes for the finding chart and the coadded images for the UVOT filters are listed below: Finding chart: Filter T_range (s) Exposure (s) 3sigma UL White 83-181 98 19.46 Coadded images: Filter T_range (s) Exposure (s) 3sigma UL WHITE 83-12239 1394 20.89 V 183-29590 1235 19.66 B 391-18023 1822 21.03 U 366-23807 2203 20.76 W1 343-23609 2200 20.82 M2 300-22702 1613 20.86 W2 419-28770 1279 20.93 T_range is calculated from the time of the burst. No correction has been made for the Galactic reddening of E(B-V) = 0.33 mag (Schlegel et al. 1998) along the line of sight to the burst.