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Recently LIGO and VIRGO collaborations reported about observation ofgravitational-wave signal corresponding to the inspiral and merger of two blackholes, resulting into formation of the final black hole. It was shown that theobservations are consistent with the Einstein theory of gravity with highaccuracy limited mainly by the statistical error. Angular momentum and mass ofthe final black hole were determined with rather large allowance of tens ofpercents. Here we shall show that this indeterminacy in the range of theblack-hole parameters allows for some not negligible deformations of the Kerrspacetime leading to the same frequencies of black-hole ringing. This meansthat at the current precision of the experiment there remain some possibilitiesfor alternative theories of gravity.

Detection of gravitational waves from black holes: Is there a window for alternative theories?