TITLE:   GCN CIRCULAR
NUMBER:  15065
SUBJECT: GRB 130803A: Swift/UVOT Upper Limits
DATE:    13/08/04 02:09:13 GMT
FROM:    Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>

F. E. Marshall (NASA/GSFC) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130803A
93 s after the BAT trigger (Page et al., GCN Circ. 15059).
No optical afterglow consistent with the enhanced XRT position
(Osborne et al. GCN Circ. 15062)
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            93          243          147         >21.0
u_FC               305          555          246         >20.3
white               93         6186          560         >21.7
v                  636        11010         1142         >20.8
b                  561         5981          413         >21.0
u                  305         5776          639         >20.7
w1                3936        16308          788         >21.4
m2                5167        11916         1082         >21.2
w2                4757         6392          393         >20.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst