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On 2016, Apr 13, , at 11:05, Donald Polvani <dgpolvani@verizon.net> wrote:
The two LIGO detectors (Hanford, WA and Livingston, LA) are 3002 km apart.
For a gravitational wave, traveling at the speed of light, this gives a
range of possible delay times between the two detectors of 0 to 10 ms
depending on the angle of arrival of the wave. The observed delay time for
the September detection was 6.9 ms. The angular position of the source is
reported as within an area of 600 deg^2 consistent with the 6.9 ms
measurement. The experimenters say that to further pin down the angle of
arrival (and, thus, the speed of the wave) a third remote detector is
required (possibly in India?).
https://physics.aps.org/featured-article-pdf/10.1103/PhysRevLett.116.061102 <https://physics.aps.org/featured-article-pdf/10.1103/PhysRevLett.116.061102>
Don