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After the work of Gladman et al. (1998), it is now assessed that manyirregular satellites are orbiting around Uranus. Despite many studies have beenperformed in past years, very few is know for the light-curves of these objectsand inconsistencies are present between colours derived by different authors.This situation motivated our effort to improve both the knowledge of coloursand light curves. We present and discuss time series observations of Sycorax,Prospero, Stephano, Setebos and Trinculo, five faint irregular satellites ofUranus, carried out at VLT, ESO Paranal (Chile) in the nights between 29 and 30July, 2005 and 25 and 30 November, 2005. We derive light curves for Sycorax andProspero and colours for all of these these bodies. For Sycorax we obtaincolours B-V =0.839 +/- 0.014, V-R = 0.531 +/- 0.005 and a light curve which issuggestive of a periodical variation with period about 3.6 hours and amplitudeabout 0.067 +/- 0.004 mag. The periods and colours we derive for Sycorax are inagreement with our previous determination in 1999 using NTT. We derive also alight-curve for Prospero which suggests an amplitude of about 0.2 mag and aperiodicity of about 4 hours. However, the sparseness of our data, prevents amore precise characterization of the light-curves, and we can not determinewether they are one-peaked or two-peaked. Hence, these periods and amplitudeshave to be considered preliminary estimates. As for Setebos, Stephano andTrinculo the present data do not allow to derive any unambiguous periodicity,despite Setebos displays a significant variability with amplitude about aslarge as that of Prospero. Colours for Prospero, Setebos, Stephano and Trinculoare in marginal agreement with the literature.

Light curves and colours of the faint Uranian irregular satellites Sycorax, Prospero, Stephano, Setebos and Trinculo