The 3D Grazing Collision of Two Black Holes
  We present results for two colliding black holes (BHs), with angular momentum, spin, and unequal mass. For the first time gravitational waveforms are computed for a grazing collision from a full 3D numerical evolution. The collision can be followed through the merger to form a single BH, and through part of the ringdown period of the final BH. The apparent horizon is tracked and studied, and physical parameters, such as the mass of the final BH, are computed. The total energy radiated in gravitational waves is shown to be consistent with the total mass of the spacetime and the final BH mass. The implication of these simulations for gravitational wave astronomy is discussed. 
Miguel Alcubierre, Werner Benger, Bernd Bruegmann, Gerd Lanfermann,   Lars Nerger, Edward Seidel, Ryoji Takahashi