GCN Circular 35154
N.P.M. Kuin (MSSL/UCL) and S. L. Laha (GSFC/UMBC) report on behalf of the Swift/UVOT team: The initial Swift/UVOT observations of the field of GRB 231117A (Laha et al., GCN Circ. 35071) have been reported by Kuin and Laha (GCN Circ. 35134) based on the enhanced XRT position (Beardmore et al. GCN Circ. 35074). A refined position was published by Yang et al. (GCN Circ. 35083) which we use for the current circular. We report here exposures taken over the specified period and summed for better S/N. We also report here in AB magnitudes (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373): Filter T_start(s) T_stop(s) Exp(s) AB-Mag white 106 1713 392 22.3 +/- 0.5 u 5863 18,406 917 20.9 +/- 0.2 white 67,725 68,529 675 21.7 +/- 0.2 white 210,209 223,742 4848 22.4 +/- 0.4 Considering that these are AB magnitudes, we can compare the white and u values to see a likely peak around the time of the u magnitude with a subsequent decay. The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.071 in the direction of the burst (Schlegel et al. 1998).