Search for long-lived gravitational-wave transients coincident with long gamma-ray bursts

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 ($\ensuremath{\sim}10--1000\text{ }\text{ }\mathrm{s}$) 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 $F<3.5\text{ }\text{ }\mathrm{ergs}\text{ }{\mathrm{cm}}^{\ensuremath{-}2}$ to $F<1200\text{ }\text{ }\mathrm{ergs}\text{ }{\mathrm{cm}}^{\ensuremath{-}2}$, depending on the GRB and on the model, allowing us to probe optimistic scenarios of GW production out to distances as far as $\ensuremath{\approx}33\text{ }\text{ }\mathrm{Mpc}$. Advanced detectors are expected to achieve strain sensitivities $10\ifmmode\times\else\texttimes\fi{}$ better than initial LIGO, potentially allowing us to probe the engines of the nearest long GRBs.

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