the phrase “is/are GO” is usually used to indicate that something is cleared for activation/launch.
As such, it should not be turned into “is/are gone”, as that has a completely different connotation.
EG: “We’re now at T-minus 10… 9… 8… 7… 6… 5… Main Engines are GO … 3… 2… 1… And we have liftoff!”