NOTE: uvot_fluxes_wget.pl vrs. 2023-03-23 fem at 240305d03h18m53s015824usUT
NOTE: Source region spec. is: 229.720 -57.363 3"
NOTE: Used archived BAT position of 229.72000 -57.36300
NOTE: position reference is GCN_Position_Notice

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

GRB 240304: Swift/UVOT Upper Limits

M. H. Siegel (PSU) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 240304
158 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

u_FC               158          408          246         >19.8
v                  466         1835          175         >18.9
b                  414         1785          175         >19.9
u                  158         1760          549         >20.2
w1                 515         1885          175         >19.4
m2                 641         1711          117         >19.2
w2                 442         1811          117         >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 7.866 in the direction of the burst
(Schlegel et al. 1998).