  We present a phenomenological model to explain the light curves of gamma-ray
bursts. In the model a black hole is orbited by a precessing accretion disc
which is fed by a neutron star. Gamma-rays are produced in a highly collimated
beam via the Blandford-Znajek mechanism. The gamma-ray beam sweeps through
space due to the precession of the slaved accretion disc. The light curve
expected from such a precessing luminosity cone can explain the complex
temporal behavior of observed bright gamma-ray bursts.
