Black-hole ejecta by frame-dragging along the axis of rotation

An energy $E=\omega J$ is derived for gravitational spin-orbit coupling by frame-dragging $\omega$ acting on angular momentum $J$. This interaction defines a no-boundary mechanism for linear acceleration of magnetized matter along the axis of rotation of black holes. We explain GRB030329/SN2003dh by centered nucleation of a high-mass black hole with rapid rotation, producing baryon-poor ejecta by gravitational spin-orbit coupling. The duration of the burst is attributed to spin-down in the emission of gravitational-waves by a surrounding non-axisymmetric torus.