NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 190401d04h27m15s506963usUT
NOTE: Source region spec. is: 326.237 -54.544 3"
NOTE: Used archived BAT position of 326.23700 -54.54400
NOTE: position reference is GCN_FOM_Notice
WARNING: t_start for light curve (575770840) and t_start from the exposure report (0) do not agree.
  Replace ??? in draft Circular with correct value.

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

GRB ??????: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB ??????
***???*** s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_FOM_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 initial exposures are:

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

white        575771274    575776546          283         >20.3
v            575771709    575772137          421         >18.9
u            575770840    575776522         1075         >20.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).