Long Gamma-Ray Bursts (LGRBs), the most powerful events in the Universe, are
    generated by jets that emerge from dying massive stars. Highly beamed geometry
    and immense energy make jets promising gravitational wave (GW) sources.
    However, their sub-Hertz GW emission is outside of ground based GW detectors’
    frequency band. Using a 3D general-relativistic magnetohydrodynamic simulation
    of a dying star, we show that jets inflate a turbulent, energetic bubble-cocoon
    that emits strong quasi-spherical GW emission within the ground-based GW
    interferometer band, $ 100-600 $ Hz, over the characteristic jet activity
    timescale, $ \approx 10-100 $ s. Our prediction for the source amplitude makes
    this the first non-inspiral GW source detectable by current interferometers out
    to hundreds of Mpc, with $ \approx 0.1 – 3 $ detectable events expected during
    LIGO/Virgo/Kagra’s observing run O4. These GWs are likely accompanied by
    detectable energetic core-collapse supernova and cocoon electromagnetic
    emission, making jetted stellar explosions promising multi-messenger sources.

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