GCN Circular 14814

T. A. Pritchard (PSU) and T. N. Ukwatta (MSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130606A
84 s after the BAT trigger (Ukwatta et al., GCN Circ. 14781
Not found
 
 
).
No optical afterglow consistent with the optical position
(Xu et al., GCN Circ 15783
Not found
 
 
) is detected in the initial UVOT exposures.
Aspect correction was lost in a number of sub-exposures resulting in
image streaks, rough aspect corrections and larger apertures have been
used to calibrate the field, although with a lower sensitivity.
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            84          231          144         >21.1
u_FC               293          543          246         >20.3
white               84         6539          361         >22.1
v                 5314        12245         1148         >20.6
b                  549         6334          236         >20.7
u                  293        18354          561         >20.4
w1                 672        18247         1102         >21.1
m2                5519        15930          625         >20.5
w2                1028         6744          216         >20.1

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).