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Reference.org
Golden binary
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<p> In <a href="/facts/Gravitational_wave_astronomy/eJGxCvdl">gravitational wave astronomy</a>, a golden binary is a <a href="/facts/Binary_black_hole/2BVQCy52">binary black hole</a> collision event whose inspiral and ringdown phases have been measured accurately enough to provide separate measurements of the initial and final black hole masses. </p>