GCN Circular 7579

Swift/UVOT began settled observations of the field of GRB 080409 starting 
88s after the BAT trigger (Holland et al., GCN Circ 7573
Not found
 
 
). We do not 
detect an optical/uv afterglow at the enhanced XRT position (Evans et al., 
GCN Circ. 7575
Not found
 
 
) in the initial finding chart observations or subsequent 
summed images down to the following 3 sigma upper limits:

Filter  T_start T_stop  Exp.    Mag UL (3sig)
 	(s)	(s)	(s)
white   88      187     93      > 20.22
white   682     7079    494     > 21.16
v       188     587     393     > 19.45
v       721     12243   1099    > 20.03
b       667     676     412     > 20.42
u       642     661     432     > 20.13
uvw1    618     637     430     > 19.86
uvm2    593     12940   1070    > 20.23
uvw2    697     11330   1082    > 20.46

The above magnitudes are not corrected for the large Galactic extinction 
in the line of sight to GRB 080409, corresponding to a reddening of 
E(B-V)=0.78 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is 
on the UVOT flight system described in Poole et al. (2008, MNRAS, 383, 
627).