Is this a very forceful "no," like when they say "No, not the mind probe!" in Doctor Who? (Only example I can think of :P )
It means the same. But we tend to reduplicate the words when we make a sentence.
Ex: Bukan, bukan itu Tidak, tidak bisa
In this case however, bukan is used twice to emphasize the negation. A more literal translation from English would be "Tidak, bukan itu" but it would not be seen as correct.