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We present the photometric and spectroscopic evolution of the type Icsupernova LSQ14efd, discovered by the La Silla QUEST survey and followed byPESSTO. LSQ14efd was discovered few days after explosion and the observationscover up to ~100 days. The early photometric points show the signature of thecooling of the shock break-out event experienced by the progenitor at the timeof the supernova explosion, one of the first for a type Ic supernova. Acomparison with type Ic supernova spectra shows that LSQ14efd is quite similarto the type Ic SN 2004aw. These two supernovae have kinetic energies that areintermediate between standard Ic explosions and those which are the mostenergetic explosions known (e.g. SN 1998bw). We computed an analytical modelfor the light-curve peak and estimated the mass of the ejecta 6.3 +/- 0.5 Msun,a synthesized nickel mass of 0.25 Msun and a kinetic energy of Ekin = 5.6 +/-0.5 x 10^51 erg. No connection between LSQ14efd and a GRB event could beestablished. However we point out that the supernova shows some spectroscopicsimilarities with the peculiar SN-Ia 1999ac and the SN-Iax SN 2008A. Acore-collapse origin is most probable considering the spectroscopic,photometric evolution and the detection of the cooling of the shock break-out.

LSQ14efd: observations of the cooling of a shock break-out event in a type Ic Supernova