TITLE: GCN CIRCULAR NUMBER: 10830 SUBJECT: GRB 100606A: Swift/UVOT Upper Limits DATE: 10/06/07 11:09:41 GMT FROM: Samantha Oates at MSSL S. R. Oates (MSSL-UCL) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 100606A 107s after the BAT trigger (Oates et al., GCN Circ. 10824). We do not detect any source at the enhanced Swift XRT position (Evans et al. GCN Circ. 10827). The 3-sigma upper limits for the finding chart exposures (FC) and summed images are: Filter T_start T_stop Exp(s) Mag (3-sigma upper limit) ------------------------------------------------------------- white (FC) 107 256 147 > 21.08 u (FC) 319 568 246 > 20.35 white 598 6542 461 > 21.70 v 648 6952 333 > 19.86 b 574 6337 312 > 20.76 u 722 7567 487 > 20.47 uvw1 698 7362 490 > 20.54 uvm2 673 7157 274 > 19.93 uvw2 1030 6748 255 > 20.27 ------------------------------------------------------------- The quoted upper limits have not been corrected for the expected Galactic extinction due to the reddening of E_(B-V) = 0.03 mag along the line of sight. All photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).