TITLE:   GCN CIRCULAR
NUMBER:  14814
SUBJECT: GRB 130606A: Swift/UVOT Upper Limits
DATE:    13/06/07 20:02:03 GMT
FROM:    Tyler Pritchard at PSU  <tapritchard@astro.psu.edu>

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).
No optical afterglow consistent with the optical position
(Xu et al., GCN Circ 15783) 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).