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We present the discovery and extensive early-time observations of the Type Icsupernova (SN) PTF12gzk. Our finely sampled light curves show a rise of 0.8magwithin 2.5hr. Power-law fits [f(t)\sim(t-t_0)^n] to these data constrain theexplosion date to within one day. We cannot rule out the expected quadraticfireball model, but higher values of n are possible as well for larger areas inthe fit parameter space. Our bolometric light curve and a dense spectralsequence are used to estimate the physical parameters of the exploding star andof the explosion. We show that the photometric evolution of PTF12gzk is slowerthan that of most SNe Ic, and its high ejecta velocities (~30,000km/s four daysafter explosion) are closer to the observed velocities of broad-lined SNe Icassociated with gamma-ray bursts (GRBs) than to the observed velocities innormal Type Ic SNe. The high velocities are sustained through the SN earlyevolution, and are similar to those of GRB-SNe when the SN reach peakmagnitude. By comparison with the spectroscopically similar SN 2004aw, wesuggest that the observed properties of PTF12gzk indicate an initial progenitormass of 25-35 solar mass and a large (5-10E51 erg) kinetic energy, close to theregime of GRB-SN properties. The host-galaxy characteristics are consistentwith GRB-SN hosts, and not with normal SN Ic hosts as well, yet this SN doesnot show the broad lines over extended periods of time that are typical ofbroad-line Type Ic SNe.

Discovery and Early Multi-Wavelength Measurements of the Energetic Type Ic Supernova PTF12gzk: A Massive-Star Explosion in a Dwarf Host Galaxy