TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3598 SUBJECT: GRB 050713A: Swift/UVOT observation DATE: 05/07/13 18:19:27 GMT FROM: Alexander Blustin at MSSL-UCL A. Blustin (MSSL), A. Falcone (PSU), D. Hinshaw (GSFC-SPSYS), P. Meszaros (PSU) report on behalf of the Swift UVOT team: Using summed images from Swift/UVOT of the field of GRB 050713A, taken from 75 seconds after the BAT trigger, no new source is detected within the XRT error circle (Falcone et al., GCN 3581) in any of the six filters down to the following 3-sigma magnitude upper limits: Filter Exposure (s) T_mid (s) 3-sig limit V 129 252 17.98 B 36 351 18.08 U 39 309 17.81 UVW1 39 325 16.85 UVM2 39 311 17.13 UVW2 29 326 17.08 where T_mid is the mid-point of the summed observation. The image background is significantly higher than expected at this location due to the proximity of a 6.56 V magnitude star (HD 204408). We caution that the instrument is not yet fully calibrated and that the magnitude limits presented here may need to be refined.