TITLE:   GCN CIRCULAR
NUMBER:  16343
SUBJECT: GRB 140529A: Swift/UVOT Upper Limits
DATE:    14/05/30 12:31:31 GMT
FROM:    Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>

S. R. Oates (IAA-CSIC, MSSL-UCL) and J.L. Racusin (GSFC) 
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of the ground-detected 
GRB 140529A 65ks after the BAT trigger (Cummings, GCN. Circ. 16340).
No optical afterglow consistent with the XRT position 
(Evans et al., GCN Circ. 16342) 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 initial exposures are:

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

white             65040       69412          287         >21.0
u                 65017       74873         1635         >21.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).