  We report on accurate BVRI photometry for the two Uranus irregular satellites
Sycorax and Caliban. We derive colours, showing that
  Sycorax is bluer than Caliban. Our data allows us to detect a significant
variability in the Caliban's light-curve, which suggests an estimated period of
about 3 hours. Despite it is the brighter of the two bodies, Sycorax does not
display a strong statistically significant variability. However our data seem
to suggest a period of about 4 hours
