The LIGO Scientific Collaboration, the Virgo Collaboration: J. Aasi, J. Abadie, B. P. Abbott, R. Abbott, T. Abbott, M. R. Abernathy, T. Accadia, F. Acernese, C. Adams, T. Adams, R. X. Adhikari, C. Affeldt, M. Agathos, N. Aggarwal, O. D. Aguiar, P. Ajith, B. Allen, A. Allocca, E. Amador Ceron, D. Amariutei, R. A. Anderson, S. B. Anderson, W. G. Anderson, K. Arai, M. C. Araya, C. Arceneaux, J. Areeda, S. Ast, S. M. Aston, P. Astone, P. Aufmuth, C. Aulbert, L. Austin, B. E. Aylott, S. Babak, P. T. Baker, G. Ballardin, S. W. Ballmer, J. C. Barayoga, D. Barker, S. H. Barnum, F. Barone, B. Barr, L. Barsotti, M. Barsuglia, M. A. Barton, I. Bartos, R. Bassiri, A. Basti, J. Batch, J. Bauchrowitz, Th. S. Bauer, M. Bebronne, B. Behnke, M. Bejger, M.G. Beker, A. S. Bell, C. Bell, I. Belopolski, G. Bergmann, et al. (817 additional authors not shown)
Long gamma-ray bursts (GRBs) have been linked to extreme core-collapse
supernovae from massive stars. Gravitational waves (GW) offer a probe of the
physics behind long GRBs. We investigate models of long-lived (~10-1000s) GW
emission associated with the accretion disk of a collapsed star or with its
protoneutron star remnant. Using data from LIGO's fifth science run, and GRB
triggers from the swift experiment, we perform a search for unmodeled
long-lived GW transients. Finding no evidence of GW emission, we place 90%
confidence level upper limits on the GW fluence at Earth from long GRBs for
three waveforms inspired by a model of GWs from accretion disk instabilities.
These limits range from F<3.5 ergs cm^-2 to $F<1200 ergs cm^-2, depending on
the GRB and on the model, allowing us to probe optimistic scenarios of GW
production out to distances as far as ~33 Mpc. Advanced detectors are expected
to achieve strain sensitivities 10x better than initial LIGO, potentially
allowing us to probe the engines of the nearest long GRBs.