The Antennae is a pair of late type spirals in the course of merging .
The interaction triggered an ongoing strong burst of star formation that also produced a large number of Young Star Clusters ( YSCs ) , many of which seem to be young Globular Clusters ( GCs ) .
The observed Luminosity Function of the YSC system is a power-law .
We use evolutionary synthesis models for star clusters in comparison with HST WFPC observations of the YSC system in the Antennae to analyse the mass function of this { \sim 2 \cdot 10 ^ { 8 } } yr young star cluster system .
Properly accounting for age spread effects by individually age-dating the YSCs we find that the intrinsic Mass Function ( MF ) is log-normal in shape and in intriguing agreement with the MF of old GC systems .
We discuss this MF in the context of cluster formation and dynamical effects in the tidal field of the parent galaxy and speculate about its future evolution .