The acceleration of a jet to relativistic velocities produces a unique memory
    type gravitational waves (GW) signal: {\it Jet-GW}. I discuss here resent
    result concerning properties of these GWs and consider their detectability in
    current and proposed detectors. Classical sources are long and short Gamma-ray
    bursts as well as hidden jets in core-collapse supernovae. Detection of jet-GWs
    from these sources will require detectors, such as the proposed BBO, DECIGO and
    lunar based detectors, that will operate in the deciHz band. The current LVK
    detectors could detect jet-GWs from a Galactic SGR flare if it is sufficiently
    asymmetric. Once detected these signals could reveal information concerning jet
    acceleration and collimation that cannot be explored otherwise.

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