NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180805d20h37m48s860669usUT
NOTE: Source region spec. is: 25.78171 -17.49344 4"
NOTE: Used archived XRT position of  25.78171 -17.49344  4.00
NOTE: position reference is GCN_Circulars-23077

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

GRB 180805B: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180805B
85 s after the BAT trigger (D'Avanzo et al., GCN Circ. 23076).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 23077)
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 first
finding chart (FC) exposure and subsequent exposures are:

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

white_FC            85          235          147         >20.8
u_FC               297          546          246         >20.2
white               85         1544          392         >21.3
v                  626         1421           78         >18.6
b                  552         1519           97         >20.0
u                  297          546          246         >20.2
w1                 675         1470           97         >18.8
m2                1078         1097           19         >17.8
w2                 774         1569           78         >19.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).