GCN Circular 19643

B. G. Balzer  (PSU) and C. B. Markwardt (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160629A
77035 s after the INTEGRAL trigger (Gotz et al., GCN Circ. 19621
Not found
 
 
).
No optical afterglow consistent with the optical position
(Klotz et al., GCN Circ 19622, Sokolov, et al. GCN Circ 19623) or the
XRT position (D�Ai� et al., GCN Circ. 19641
Not found
 
 
) is detected.
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

u                77035        89233         2633         >21.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.40 in the direction of the burst
(Schlegel et al. 1998).