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SN2010ah, a very broad-lined type Ic SN discovered by the Palomar TransientFactory, was interesting because of its relatively high luminosity and the highvelocity of the absorption lines, which was comparable to that of GRB/SNe,suggesting a high explosion kinetic energy. However, no GRB was detected inassociation with the SN. Here, the properties of SN2010ah are determined withhigher accuracy than previous studies through modelling. New Subaru telescopephotometry is presented. A bolometric light curve is constructed takingadvantage of the spectral similarity with SN1998bw. Radiation transport toolsare used to reproduce the spectra and the light curve. The results thusobtained regarding ejecta mass, composition and kinetic energy are then used tocompute a synthetic light curve. This is in reasonable agreement with the earlybolometric light curve of SN2010ah, but a high abundance of 56Ni at highvelocity is required to reproduce the early rise, while a dense inner core mustbe used to reproduce the slow decline at late phases. The high-velocity 56Nicannot have been located on our line of sight, which may be indirect evidencefor an off-axis, aspherical explosion. The main properties of SN2010ah are:ejected mass ~ 3 Mo; kinetic energy ~10^52 erg, M(56Ni) ~ 0.25 Mo. The masslocated at v >~ 0.1c is ~0.2 Mo. Although these values, in particular thekinetic energy, are quite large for a SN Ic, they are all smaller (especiallythe ejecta mass) than those typical of GRB/SNe. This confirms the tendency forthese quantities to correlate, and suggests that there are minimum requirementsfor a GRB/SN, which SN2010ah may not meet although it comes quite close.Depending on whether a neutron star or a black hole was formed following corecollapse, SN2010ah was the explosion of a CO core of ~ 5-6 Mo, pointing to aprogenitor mass of ~24 - 28 Mo.

The very energetic, broad-lined type Ic Supernova 2010ah (PTF10bzf) in the context of GRB/SNe