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We present spectroscopic and photometric data of the peculiar SN 2001gh,discovered by the 'Southern inTermediate Redshift ESO Supernova Search'(STRESS) at a redshift z=0.16. SN 2001gh has relatively high luminosity atmaximum (M_B = -18.55 mag), while the light curve shows a broad peak. Anearly-time spectrum shows an almost featureless, blue continuum with a few weakand shallow P-Cygni lines that we attribute to HeI. HeI lines remain the onlyspectral features visible in a subsequent spectrum, obtained one month later. Aremarkable property of SN 2001gh is the lack of significant spectral evolutionover the temporal window of nearly one month separating the two spectra. Inorder to explain the properties of SN 2001gh, three powering mechanism areexplored, including radioactive decays of a moderately large amount of 56Ni,magnetar spin-down, and interaction of SN ejecta with circumstellar medium. Wefavour the latter scenario, with a SN Ib wrapped in a dense, circumstellarshell. The fact that no models provide an excellent fit with observations,confirms the troublesome interpretation of the nature of SN 2001gh. A rateestimate for SN 2001gh-like event is also provided, confirming the intrinsicrarity of these objects.

Explosion of a massive, He-rich star at z=0.16