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The observation of gravitational waves from the Laser InterferometerGravitational-Wave Observatory (LIGO) event GW150914 may be used to constrainthe possibility of Lorentz violation in graviton propagation, and theobservation by the Fermi Gamma-Ray Burst Monitor of a transient source inapparent coincidence may be used to constrain the difference between thevelocities of light and gravitational waves: $c_g - c_\gamma < 10^{-17}$.

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