Aasi, J.Abadie, J.Abbott, B.Abbott, R.Abbott, T.Abernathy, M.Accadia, T.Acernese, F.Adams, C.Adams, T.Adhikari, R.Affeldt, C.Agathos, M.Aggarwal, N.Aguiar, O.Ajith, P.Allen, B.Allocca, A.Amador Ceron, E.Amariutei, D.et al.2016-07-062016-07-062013Physical Review D: Particles, Fields, Gravitation and Cosmology, 2013; 88(12):122004-1-122004-131550-79981550-2368http://hdl.handle.net/2440/100065Long 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 (~10–1000 s) 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 10× better than initial LIGO, potentially allowing us to probe the engines of the nearest long GRBs.en© 2013 American Physical SocietyJournal article002013437310.1103/PhysRevD.88.1220040003286925000042-s2.0-8489647564116565