Four additional bursts from the same source were found on 20 September 2016 by the EVN, which, along with data from the Arecibo dish, helped provide an even more
precise localization within the galaxy, according to a paper published today in Astrophysical Journal Letters.
Because all three gravitational - wave detectors saw the signal, physicists could triangulate and locate the source to
within a 30 - square - degree patch of sky — about 60 times the size of the moon and much more
precise than Fermi's
localization.