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The USS Greyhound was a Federation starship which encountered an extra galactic probe prior to 2364.

In 2364, the location of the Greyhound was labeled in a star chart. This chart was stored in the USS Enterprise-D library computer. Later that year, the chart was scanned by Outpost 63. (TNG: "The Naked Now"; TNG: "The Last Outpost", "Conspiracy")

This starship was only mentioned in writing.
The Enterprise computer's star chart was a drawing by Rick Sternbach that had originally been published, years earlier, reference titled Star Trek Spaceflight Chronology (p. 115). This chart showed Federation commercial lanes and exploration routes, but no additional text about the vessel, just the labeled name of the ship at the encounter location.
According to information presented in the same source, on page 121, the Greyhound was a Castor-class (β) starship, which, in 2124, found the first evidence of extra-galactic civilizations.

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