  We present all the publicly available data, from optical/UV wavelengths
(UVOT) to X-rays (XRT, BAT), obtained from Swift observations of the blazar PKS
2155-304, performed in response to the rapid alert sent out after the strong
TeV activity (up to 17 Crab flux level at E > 200 GeV) at the end of July 2006.
The X-ray flux increased by a factor of 5 in the 0.3-10 keV energy band and by
a factor of 1.5 at optical/UV wavelengths, with roughly one day of delay. The
comparison of the spectral energy distribution built with data
quasi-simultaneous to the TeV detections shows an increase of the overall
normalization with respect to archival data, but only a small shift of the
frequency of the synchrotron peak that remains consistent with the values
reported in past observations when the TeV activity was much weaker.
