Board Thread:General Discussion/@comment-4440927-20150410030856/@comment-1352718-20150420032315

I used to believe GT was just a continuation, a sequel, of Z. It was made to be more like the original Dragonball rather than Z.

Though in Dragonball Xenoverse's DLC GT Saga, Future Trunks said that when he first did his time machine jump, it created more timelines on its own and that the timeline the main character is currently in is the timeline where Baby took over Earth. That seems to imply that GT is an alternate continuation.

However there was a rebuttal to Future Trunks claim is that in Xenoverse, Super Saiyan 4 Goku (GT) when faced against Whis ponders if he is strong enough to match Lord Beerus in his Super Saiyan 4 Form as one of the bottom left dialogue. So this definitely eats at people's logic that Z/Son Goku Returns/BoG/RoF is probably in the same continuity as GT.