TITLE: GCN CIRCULAR NUMBER: 8043 SUBJECT: GRB 080727C: Swift/UVOT Upper Limits DATE: 08/07/28 19:41:18 GMT FROM: Erik Hoversten at Swift/Penn State E. A. Hoversten (PSU) and A. M. Parsons (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began observing the field of GRB 080727C starting 82 seconds after the BAT trigger (Parsons, et al. GCN Circ. 8035). We do not detect any source in any of the filters at the UVOT-enhanced XRT position (Osborne, et al., GCN Circ. 8038). The 3-sigma upper limits at this position for single exposures are: Filter T_start T_stop Exp(s) Mag (3-sigma upper limit) ----------------------------------------------------- white 82.1 181.0 97.3 > 20.81 white 3987.1 4186.8 196.6 > 21.58 v 187.4 587.2 393.5 > 19.89 v 4397.7 4597.5 196.6 > 19.93 b 668.8 673.4 4.6 > 17.79 u 643.0 662.8 19.5 > 18.32 uvw1 618.4 638.2 19.5 > 18.11 uvm2 593.5 613.3 19.5 > 17.61 uvw2 4192.9 4392.7 196.6 > 20.17 The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a large reddening of E_{B-V} = 1.1 mag. All photometry is on the UVOT flight system described in Poole et al. (2008, MNRAS, 383, 627).