GRB 241006A: Swift/UVOT Upper Limits

The Swift/UVOT began settled observations of the field of GRB 241006A 350 s after the BAT trigger (Gupta et al., GCN Circ. 37722). 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).