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Dust attenuation curves in external galaxies are useful to study their dustproperties as well as to interpret their intrinsic spectral energydistributions. In particular the presence or absence of a UV bump at 2175 Aremains an open issue which has consequences on the interpretation of broadband colours of distant galaxies. We study the dust attenuation curve in the UVrange at z >1. In particular we search for the presence of a UV bump. We usedeep photometric data of the CDFS obtained with intermediate and broad bandfilters by the MUSYC project to sample the UV rest-frame of galaxies with 1<z<2. Herschel/PACS and Spitzer/MIPS data are used to measure the dust emission.30 galaxies were selected with high S/N in all bands. Their SEDs from the UV tothe far-IR are fitted using the CIGALE code and the characteristics of the dustattenuation curve are obtained. The mean dust attenuation curve we deriveexhibits a UV bump at 2175A whose amplitude corresponds to 35 % (76%) that ofthe MW (LMC2 supershell) extinction curve. An analytical expression of theaverage attenuation curve is given, it is found slightly steeper than theCalzetti et al. one, although at a 1 sigma level. Our galaxy sample is used tostudy the derivation of the slopes of the UV continuum from broad band colours,including the GALEX FUV-NUV colour. Systematic errors induced by the presenceof the bump are quantified. We compare dust attenuation factors measured withCIGALE to the slope of the UV continuum and find that there is a large scatteraround the relation valid for local starbursts (0.7 mag). The uncertainties onthe determination of the UV slope lead to an extra systematic error of theorder of 0.3 to 0.7 mag on dust attenuation when a filter overlaps the UV bump.

GOODS-HERSCHEL: evidence for a UV extinction bump in galaxies at z > 1