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>FWIW, these gravitational waves are too low in frequency for LIGO to catch.

Will this be true throughout the collision? The ones we've recorded have a sort of 'chirp' right before the merge.

The chirp doesn't go to infinite frequency. The last rotation of the two black holes happens in some finite time, a time scale that gets longer the larger the black holes are.

Of course, that's kind of what I was after. Whether or not they would achieve a detectable frequency prior to the merger.

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