...${\sim}$0.3

Based on observations collected at the European Southern Observatory, Chile (ESO Programmes 62.H-0833, 63.H-0322, 64.H-0390, 67.D-0422, 68.D-0273, 69.D-0453).

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... IRAF

IRAF is distributed by the National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.

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... MySQL

MySQL is an open source database without a license fee under the GNU General Public License (GPL). See the project homepage for further details. http://www.mysql.com/

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... modulus

Hereafter, we assume a standard flat cosmology $\Omega_{\rm M}=0.3$ and  $\Omega_\Lambda=0.7$ and h=H₀/75.

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... SNu]

1 SNu = 1 supernova century $^{-1}~10^{-10}~{L}_{{B}_\odot}$.

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... Sect. 6)

After submission of this article, two preprints have been posted reporting new estimates of the SN rate evolution up to redshift 1.6, as part of the Great Observatories Origins Deep Survey (Strolger et al. 2004; Dahlén et al. 2004). The main caveat is that, as in our case, they could obtain spectroscopic classification only for a fraction of the candidates. Their estimate of the CC SN rate at redshift z=0.3 is in remarkable agreement with the result reported here.

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