Array
An array weapon fires at all targets within a single firing arc. The gunner attempts a single gunnery check against each target in the firing arc, starting with those closest to her starship. Each gunnery check takes a –4 penalty, which stacks with other penalties. Roll damage only once for all targets. Critical damage is determined by each target’s Critical Threshold. The gunner can’t avoid shooting at allies in the firing arc, nor can she shoot any target more than once. An array weapon uses two weapon mounts.
Source
Core Rulebook pg. 304