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We introduce a novel test of General Relativity in the strong-field regime ofa binary black hole coalescence. Combining information coming from NumericalRelativity simulations of coalescing black hole binaries with a Bayesianreconstruction of the gravitational wave signal detected in LIGO-Virgointerferometric data, allows one to test theoretical predictions for theinstantaneous gravitational wave frequency measured at the peak of thegravitational wave signal amplitude. We present the construction of such a testand apply it on the first gravitational wave event detected by the LIGO andVirgo Collaborations, GW150914. The $p$-value obtained is $p=0.48$, to becontrasted with an expected value of $p=0.5$, so that no signs of violationsfrom General Relativity were detected.

GW150914 peak frequency: a novel consistency test of strong-field General Relativity