TITLE:   GCN CIRCULAR
NUMBER:  14715
SUBJECT: GRB 130527A: Swift/UVOT Upper Limits
DATE:    13/05/29 00:50:04 GMT
FROM:    Margaret Chester at PSU  <chester@astro.psu.edu>

M. M. Chester (PSU) and B. P. Gompertz (U Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130527A
113 s after the BAT trigger (Gompertz et al., GCN Circ. 14703).
No optical afterglow consistent with the XRT position (Evans et al. 
GCN Circ. 14705) 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) exposures and subsequent exposures are:

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

white_FC           113          263          147         >21.2
white              113         1547          392         >21.1
white             4949        12020          623         >21.8

v                  655         1596          117         >18.7
v                 5359         5559          197         >19.5

b                  581         1693          114         >20.2
b                 6179        11579          906         >21.3

u_FC               325          575          246         >20.3
u                  325         1671          343         >20.2
u                 5974        18261         1072         >21.1

w1                 704         1646           97         >19.8
w1                5769        17356         1082         >21.1

m2                 680         1621          117         >20.0
m2                5564         5764          197         >19.8

w2                 630         1572          117         >20.6
w2                5154         5354          197         >20.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).