NOTE: uvot_fluxes_wget.pl vrs. 2023-03-23 fem at 240419d15h02m11s748218usUT
NOTE: Source region spec. is: 325.8963 +4.2354 4"
NOTE: Used archived XRT position of 325.89630   4.23540  4.00
NOTE: position reference is GCN_Notice
WARNING: Did not find t_start in exposure report.
WARNING: Did not recognize UBS name.

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

GRB 240419B: Swift/UVOT Upper Limits

Shilling (***INSTITUTION***) and S. Dichiara (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 240419B
159 s after the BAT trigger (Dichiara et al., GCN Circ. 36180).
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           159          308          147         >20.2
u_FC               317          567          246         >19.7
white              159          790          186         >20.4
v                  647          667           19         >17.5
b                  572          765           39         >18.3
u                  317          741          265         >19.7
w1                 696          716           19         >17.9
m2                 672          691           19         >18.6
w2                 623          643           19         >18.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.077 in the direction of the burst
(Schlegel et al. 1998).