2003ApJ...583..374V

A torus develops a state of suspended accretion against a magnetic wall around a rapidly rotating black hole formed in core-collapse hypernovae. It hereby emits about 10% of the black hole spin energy in gravitational radiation from a finite number of multipole mass moments. We quantify the relation between the frequency of quadrupole gravitational radiation and the energy output E_win torus winds by f_gw≃470Hz(E_w/4x10⁵²ergs)^1/2(7M_☉/M)^3/2, where M denotes the mass of the black hole. We propose that E_wirradiates the remnant stellar envelope from within. We identify E_wwith energies ∼10⁵² ergs inferred from X-ray observations on matter injecta and the poloidal curvature in the magnetic wall with the horizon opening angle in baryon poor outflows that power true GRB energies of E_γ≃3x10⁵¹ ergs.