There have been plenty of signals found, here's another:
Interviewing John Hogue on Jan 03, 2006, Whitely Strieber said that during the period between Sept. 30 - Oct. 1, 2002, Very Large Array Radio Telescope in Socorro, New Mexico, observed extremely powerful signals in radio-spectrum range from centre of the Galaxy. They lasted 10 minutes each and appeared every 77 minutes for 7 hours.
John Hogue was extremely interested and said that number 777 is esoteric number of the Divine.
777 is the number of the Divine.
Its transmission occurred 20 days before it is indicated on The Great Cross in Hendaye.
Precisely when Earths axis of rotation become parallel to that of our Galaxy creating with plane in which all its components rotate around its core exact angle of 90 deg.
Above from
deepspace4.com
Now we know where the greatwork gets his number