GCN Circular 19871

S. J. LaPorte (PSU) and B. Mingo (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160826A
109 s after the BAT trigger (Mingo et al., GCN Circ. 19866
Not found
 
 
).
No optical afterglow consistent with the XRT position
(Mingo et al. GCN Circ. 19868
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 first
finding chart (FC) exposure and subsequent exposures are:

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

white_FC           109          259          147         >21.1
u_FC               267          517          246         >19.8
white              109         1195          353         >22.1
v                  597         1245           78         >19.8
b                  523         1170           58         >20.2
u                  267         4893          340         >19.8
w1                 648         1290           74         >19.0
m2                 622         1269           78         >19.3
w2                 573         1220           78         >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.47 in the direction of the burst
(Schlegel et al. 1998).