Today LIGO announced discovery of Gravitational waves. What method was used to determine the source location of the waves?
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According to their paper, the source location was primarily determined by the 6.9 ms difference in arrival time between LIGO's two detectors. Since the speed of propagation of the gravitational wave is known (gravitational waves travel at the speed of light), the known difference in arrival time narrows down the source direction to being along a particular circle.
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