Gravitational Radiation from Gamma‐Ray Burst Progenitors

We study gravitational radiation from various proposed gamma-ray burst (GRB)progenitor models, in particular compact mergers and massive stellar collapses.These models have in common a high angular rotation rate, and the final stageinvolves a rotating black hole and accretion disk system. We consider thein-spiral, merger and ringing phases, and for massive collapses we consider thepossible effects of asymmetric collapse and break-up, as well bar-modeinstabilities in the disks. We calculate the strain and frequency of thegravitational waves expected from various progenitors, at distances based onoccurrence rate estimates. Based on simplifying assumptions, we give estimatesof the probability of detection of gravitational waves by the advanced LIGOsystem from the different GRB scenarios.Comment: 26 pages, 5 figures, accepted for publication in Ap