I seem to be laboring under a misconception. In conducting a jump assault, I thought it went this way:
Turn 1: Attacking fleet jumps in, can't target because doesn't know what's there. Defending fleet can't target or fire either.
Turn 2: Attacking fleet suffers jump shock and may or may not be able to fire. Defending fleet can fire.
But, based on an experiment I just ran (I'm calling it that), it seems that the defenders can fire as soon as the attacking fleet appears, i.e., on turn one. Is this right?