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

GRB 130504C: Swift/UVOT Upper Limits

De_Pasquale (***INSTITUTION***) and A. Y. Lien (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130504C
65650 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
(D'Avanzo et al. GCN Circ. 14588)
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

w2               65650        93317         7732         >22.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.61 in the direction of the burst
(Schlegel et al. 1998).