Bets?
If Israel is attacked by a nuclear weapon, it is going to be a terrorist bomb. The bomb will have no "fingerprints" on it that would be acceptable to a world largely hostile to Israel in the first place. In fact, five minutes after the explosion, Iran would probably be squealing about a "theft" of one of their experimental warheads.
Under the circumstances, Israel may launch a conventional attack, but I doubt they'd go nuclear.