Electromagnetic priors for black hole spindown in searches for   gravitational-waves from supernovae and long GRBs
  Some core-collapse supernovae appear to be hyper-energetic, and a subset of these are aspherical and associated with long GRBs. We use observations of electromagnetic emission from core-collapse supernovae and GRBs to impose constraints on their free energy source as a prior to searches for their gravitational wave emission. We review these events based on a finite efficiency for the conversion of spin energy to magnetic winds powering supernovae. We find that some of the hyper-energetic events cannot be powered by the spindown of rapidly rotating proto-neutron stars by virtue of their limited rotational energy. They can, instead, be produced by the spindown of black holes providing a distinct prospect for gravitational-wave emission of interest to LIGO, Virgo, and the LCGT. 
Maurice H.P.M. van Putten (1), Massimo Della Valle (2,3) and Amir   Levinson (4) ((1) Korea Institute for Advanced Study, (2...
astro-ph.HE