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Interesting

This was a couple of days days before Virgo got online AND one of the Ligo detectors was undergoing a noise modelling test (its mirrors were being vibrated at the time)

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So no second opinions then, it could just as well be noise?

No, because the noise modeling test in the second LIGO detector (LIGO Hanford) was being wobbled at a very different frequency to that of the gravitational wave they were able to filter out the test motion and were still able to detect the merger.

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