The EXCEPTION above answers it, Billy. The ball does not become dead until the airborne shooter returns to the floor.
So, to answer the OP, the official could call a foul after the horn but while the ball was in the air and/or until the airborne shooter returns to the ground. But, the official will have to determine the contact was actually a foul. I have no idea if a foul should have been called in your scenario.
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