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The locations of long GRBs and stripped supernovae are compared to those oftheir favored progenitors, WR stars, and their sub-classes. Compared toLeloudas et al. (2010), we have doubled the number of galaxies with suitable WRdata. In the combined sample, WC stars are found, on average, in brighterlocations than WN stars. The WN distribution is fully consistent with the oneof SNe Ib, while it is inconsistent with those of SNe II, Ic and GRBs. The WCdistribution is both consistent with SNe Ib and Ic. It is inconsistent with SNeII, and marginally consistent with GRBs. Furthermore, we present aspectroscopic study of the locations of SNe Ib/c. The average metallicity inthe environments of SNe Ic is found to be a little higher than for SNe Ib, butthe difference is small and not significant within our sample. Under theassumption that the SN regions were formed in an instantaneous burst of starformation, we find that a fraction of them appear older than what is allowed inorder to host SNe Ib/c from single massive stars. Within this framework, theseSNe must come from lower mass binaries.

The locations of SNe Ib/c and their comparison to those of WR stars and GRBs