  Core-collapse in massive stars is believed to produce a rapidly spinning
black hole surrounded by a compact disk or torus. This forms an energetic
MeV-nucleus inside a remnant He-core, powered by black hole-spin energy. The
output produces a GRB-supernova, while most of the energy released is in
gravitational radiation. The intrinsic gravitational-wave spectrum is
determined by multipole mass-moments in the torus. Quadrupole gravitational
radiation is radiated at about twice the Keplerian frequency of the torus,
which is non-axisymmetric when sufficiently slender, representing a ``{\em
black hole-blob}" binary system or a "{\em blob-blob}" binary bound to the
central black hole. We here discuss line-broadening in the observed spectrum
due to Lense-Thirring precession, which modulates the orientation of the torus
to the line-of-sight. This spectral feature is long-lived, due to weak damping
of precessional motion. These events are believed to occur perhaps once per
year within a distance of 100Mpc, which provides a candidate source for
Advanced LIGO.
