NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180719d18h15m17s970438usUT
NOTE: Source region spec. is: 336.019 +2.790 3"
NOTE: Used archived BAT position of 336.01900   2.79000
NOTE: position reference is GCN_Circ_22959

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

GRB 180718A: Swift/UVOT Upper Limits

S.W.K. Emery (UCL-MSSL) and J. D. Gropp (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180718A
113646 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Circ_22959 ***
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           114468       115195          716         >21.5
u               113646       114461          802         >20.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).