Can precessing jets explain the light curves of Gamma-ray Bursts?
  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. 
Simon Portegies Zwart (Boston), Chang-Hwan Lee (Stony Brook) Hyun Kyu   Lee (Seoul)