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
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 ).
No optical afterglow consistent with the XRT position (Mangano et al.,
GCN Circ 15666
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 ) 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).