TITLE:   GCN CIRCULAR
NUMBER:  14544
SUBJECT: GRB 130502B: Swift/UVOT Upper Limits
DATE:    13/05/03 15:09:16 GMT
FROM:    Alice Breeveld at MSSL-UCL  <a.breeveld@ucl.ac.uk>

A. A. Breeveld (MSSL-UCL) and S. Immler (NASA/CRESST/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130502B 
55101 s after the LAT trigger (Kocevski et al., GCN Circ. 14532). No 
optical afterglow consistent with the refined XRT position (Melandri et 
al., GCN Circ. 14540) is detected in the UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system 
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial 
exposures are:

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

white_FC         55101        55208          105         >20.3
white            55101        89746         4493         >22.1

The magnitudes in the table are not corrected for the Galactic 
extinction due to the reddening of E(B-V) = 0.21 in the direction of the 
burst (Schlegel et al. 1998).