NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 200313d09h38m51s614558usUT
NOTE: Source region spec. is: 274.5006 -16.1312 4"
NOTE: Used archived XRT position of 274.50060 -16.13120  4.00
NOTE: position reference is GCN_Notice

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

GRB 200312: Swift/UVOT Upper Limits

S. R. Oates (U.Warwick) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200312
68 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_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            68          218          147         >20.1
u_FC               280          530          246         >19.7
white               68         1181          353         >20.3
v                  610         1058           58         >18.4
b                  536         1156           58         >18.4
u                  280         1132          285         >19.7
w1                 659         1107           58         >17.9
m2                 634         1082           58         >18.1
w2                 585         1034           58         >18.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 12.87 in the direction of the burst
(Schlegel et al. 1998).