GCN Circular 16672

S. R. Oates (IAA-CSIC/UCL-MSSL) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140808A
42 ks after the GBM trigger (Zhang et al., GCN Circ. 16669
Not found
 
 
).
No optical afterglow consistent with the candidate optical position
(iPTF14eag; Singer et al. GCN Circ. 16668
Not found
 
 
) is detected in the initial UVOT exposures.

Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white          41951        47112           835         >22.3
v              42055        47902           857         >20.7
u              41848        51959           1212        >21.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).