=========== Draft Upper Limit Circular ========

GRB 160509A: Swift/UVOT Upper Limits

F. E. Marshall (NASA/GSFC) and T. G. R. Roegiers (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160509A
7259 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the optical position
(Levan et al. GCN Circ. 19410)
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

u                 7259        19794          626         >20.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.31 in the direction of the burst
(Schlegel et al. 1998).