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Aims. Our aim is to estimate the intergalactic medium transmission towardsUV-selected star-forming galaxies at redshift 4 and above and study the effectof the dust attenuation on these measurements.  Methods. The ultra-violet spectrum of high redshift galaxies is a combinationof their intrinsic emission and the effect of the Inter-Galactic medium (IGM)absorption along their line of sight. Using data coming from the unprecedenteddeep spectroscopy from the VANDELS ESO public survey carried out with the VIMOSinstrument we compute both the dust extinction and the mean transmission of theIGM as well as its scatter from a set of 281 galaxies at z>3.87. Because of adegeneracy between the dust content of the galaxy and the IGM, we firstestimate the stellar dust extinction parameter E(B-V) and study the result as afunction of the dust prescription. Using these measurements as constraint forthe spectral fit we estimate the IGM transmission Tr(Lyalpha). Both photometricand spectroscopic SED fitting are done using the SPectroscopy And photometRyfiTting tool for Astronomical aNalysis (SPARTAN) that is able to fit thespectral continuum of the galaxies as well as photometric data.  Results. Using the classical Calzetti's attenuation law we find that E(B-V)goes from 0.11 at z=3.99 to 0.08 at z=5.15. These results are in very goodagreement with previous measurements from the literature. We estimate the IGMtransmission and find that the transmission is decreasing with increasingredshift from Tr(Lyalpha)=0.53 at z=3.99 to 0.28 at z=5.15. We also find alarge standard deviation around the average transmission that is more than 0.1at every redshift. Our results are in very good agreement with both previousmeasurements from AGN studies and with theoretical models.

The Intergalactic medium transmission towards z>4 galaxies with VANDELS and the impact of dust attenuation