NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 190604d19h10m08s537226usUT
NOTE: Source region spec. is: 297.54058 -32.97803 4"
NOTE: Used archived XRT position of 297.54058 -32.97803  4.00
NOTE: position reference is GCN_Circulars-24746
WARNING: t_start for light curve (338) and t_start from the exposure report (127) do not agree.
  Replace ??? in draft Circular with correct value.

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

GRB 190604B: Swift/UVOT Upper Limits

A. A. Breeveld (UCL-MSSL) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190604B
***???*** s after the BAT trigger (Page et al., GCN Circ. 24742).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 24746)
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

u_FC               338          588          246         >19.8
white              618         1538          245         >20.1
v                  669         1588          117         >18.5
b                  594         1514           97         >19.4
u                  338         1663          343         >19.6
w1                 718         1638           97         >19.3
m2                 694          713           19         >18.6
w2                 645         1563          117         >20.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.15 in the direction of the burst
(Schlegel et al. 1998).