NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 181205d05h21m49s050581usUT
NOTE: Source region spec. is: 188.083 +16.309 3"
NOTE: Used archived BAT position of 188.08300  16.30900
NOTE: position reference is GCN_Position_Notice

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

GRB 181204: Swift/UVOT Upper Limits

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

The Swift/UVOT began settled observations of the field of GRB 181204
147 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Position_Notice ***
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           147          297          147         >20.2
u_FC               306          556          246         >19.4
white              147         1012          334         >20.4
v                  638         4466          236         >18.9
b                  563          756           39         >18.6
u                  306          731          265         >19.4
w1                 687          707           19         >17.9
m2                 835         4668          213         >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).