TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5088 SUBJECT: GRB 060507: Swift/UVOT Upper Limits DATE: 06/05/07 17:12:56 GMT FROM: Frank Marshall at GSFC F. E. Marshall and L. M. Barbier (NASA/GSFC) report on behalf of the Swift/UVOT team: The Swift UVOT began observing GRB 060507 (trigger #208870, Barbier et al., GCN 5084) 46 minutes after the BAT trigger. No optical afterglow is detected inside the error region of the candidate XRT afterglow (Vetere et al. GCN 5085). Typical upper limits for a 3.5 arc sec aperture are given below for the initial UVOT exposures. T is the time since the BAT trigger in seconds at the start of the exposure. No correction has been made for the expected extinction corresponding to E(B-V) = 0.16 mag. T Exposure filter 5-sigma UL (sec) (sec) 2790 98 White 19.4 mag 2896 197 V 18.7 mag 9567 295 White 20.6 mag