GCN Circular 37057

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

The Swift/UVOT began settled observations of the field of GRB 240805B
88 s after the BAT trigger (Williams et al., GCN Circ. 37043
Not found
 
 
).
No optical afterglow consistent with the XRT position
(Goad et al., GCN Circ. 37053
Not found
 
 
) 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            88          238          147         >20.9
u_FC               301          551          246         >19.9
white               88         1719          411         >21.6
v                  630         1768          136         >19.4
b                  556         1694          117         >19.7
u                  301         1669          343         >20.2
w1                 679         1818          136         >19.6
m2                1256         1620           39         >19.2
w2                 606         1744          136         >20.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.087 in the direction of the burst
(Schlegel et al. 1998).