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Models for the spectra and the light curve, in the photospheric as well as inthe late nebular phase, are used to infer the properties of the veryradio-bright, broad-lined type IIb Supernova 2003bg. Consistent fits to thelight curve and the spectral evolution are obtained with an explosion thatejected ~ 4 M_sun of material with a kinetic energy of ~ 5 10^51 erg. A thinlayer of hydrogen, comprising ~ 0.05 M_sun, is inferred to be present in theejecta at the highest velocities (v >~ 9000 km/s), while a thicker heliumlayer, comprising ~ 1.25 M_sun, was ejected at velocities between 6500 and 9000km/s. At lower velocities, heavier elements are present, including ~ 0.2 M_sunof 56Ni that shape the light curve and the late-time nebular spectra. Thesevalues suggest that the progenitor star had a mass of ~ 20-25 M_sun (comparableto, but maybe somewhat smaller than that of the progenitor of the XRF/SN2008D). The rather broad-lined early spectra are the result of the presence ofa small amount of material (~ 0.03 M_sun) at velocities > 0.1 c, which carries~ 10 % of the explosion kinetic energy. No clear signatures of a highlyaspherical explosion are detected.

SN2003bg: a broad-lined Type IIb Supernova with Hydrogen