NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180728d06h08m40s141719usUT
NOTE: Source region spec. is: 346.6653 -63.0505 4"
NOTE: Used archived XRT position of 346.66530 -63.05050  4.00
NOTE: position reference is GCN_Notice
WARNING: Did not find t_start in exposure report.

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

GRB 180727A: Swift/UVOT Upper Limits

F. E. Marshall (NASA/GSFC) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180727A
77 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            77          227          147         >21.2
white               77          227          147         >21.2
u                  290          303           12         >18.0

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).