GCN Circular 37729

N.P.M. Kuin and R. Gupta (NASA GSFC) report on behalf of
the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of
GRB 241006A   350 s after the BAT trigger (Gupta et al.,
GCN Circ. 37722
Not found
 
 
). No optical afterglow consistent with the XRT
position has been 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           350          499          147         >21.0
white              350          625          167         >21.0
v                  656          676           19         >17.4
b                  580          600           19         >19.0
u                  556          575           19         >17.9
w1                 531          715           28         >18.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.065 in the direction of the burst
(Schlegel et al. 1998).