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
Not found
 
 
) 83 seconds after the BAT
trigger. No optical afterglow is detected in the XRT refined error
circle (A. Moretti et al., GCN Circ. 5444
Not found
 
 
).

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.