planckscale writes "Last weekend, LIGO (Laser Interferometer Gravitational-Wave Observatory) http://en.wikipedia.org/wiki/LIGO did not detect gravitational radiation in association with a gamma ray burst (GRB) http://www.spaceref.com/news/viewpr.html?pid=24501. The non-detection was actually a valuable contribution by providing collaborating evidence of the event. The detector is due to be upgraded this year for even more accurate measurements. The interferometer is constructed in such a way that it can detect a change of less than a thousandth the diameter of an atomic nucleus in the lengths of the arms relative to each other."
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