We use three years of data from the Supernova Legacy Survey ( SNLS ) to study the general properties of core-collapse and type Ia supernovae .
This is the first such study using the “ rolling search ” technique which guarantees well-sampled SNLS light curves and good efficiency for supernovae brighter than i ^ { \prime } \sim 24 .
Using host photometric redshifts , we measure the supernova absolute magnitude distribution down to luminosities 4.5 { mag } fainter than normal SNIa .
Using spectroscopy and light-curve fitting to discriminate against SNIa , we find a sample of 117 core-collapse supernova candidates with redshifts z < 0.4 ( median redshift of 0.29 ) and measure their rate to be larger than the type Ia supernova rate by a factor 4.5 \pm 0.8 ( stat . ) \pm 0.6 ( sys . ) .
This corresponds to a core-collapse rate at z = 0.3 of [ 1.42 \pm 0.3 ( stat . ) \pm 0.3 ( sys . ) ] \times 10 ^ { -4 } { yr } ^ { -1 } ( h _ { 70 } ^ { -1 } { Mpc% } ) ^ { -3 } .