TITLE: GCN CIRCULAR NUMBER: 16114 SUBJECT: GRB 140414A: Swift/UVOT Upper Limit DATE: 14/04/15 21:52:27 GMT FROM: Frank Marshall at GSFC F. E. Marshall (NASA/GSFC), L.M.Z. Hagen (PSU), and P. D'Avanzo (INAF-OAB) report on behalf of the Swift/UVOT team: The Swift/UVOT observed the field of GRB 140414A in the U, White, and V filters starting about 40 ks after the BAT trigger (Cummings GCN Circ. 16110). Because the star tracker failed to lock, stars are trailed in all the images, and the usual UVOT sensitivities are not achieved. No optical afterglow consistent with the BAT position is detected in the any of the UVOT exposures. The results for the most sensitive exposure is reported in the table below. The limiting magnitude is estimated from the list of detected stars. Filter T_start(s) T_stop(s) Exp(s) Mag white 40958 41502 536 >20 The magnitude in the table is not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).