GCN Circular 15671

M. H. Siegel and V. Mangano (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140103A
172 s after the BAT trigger (Mangano et al., GCN Circ. 15656
Not found
 
 
).
No optical afterglow consistent with the XRT position (Mangano et al.,
GCN Circ 15666) 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 first
finding chart (FC) exposure and subsequent exposures are:

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

white_FC           172          321          147         >20.8
white              172         2581          361         >21.5
v                  406         2631          252         >19.1
b                  506         2557          233         >19.9
u                  480         2704          252         >19.5
w1                 456         2680          252         >19.6
m2                6760         8396          393         >20.0
w2                 382         2607          252         >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).