As the name would suggest the weapon uses a burst fire mode, meaning that with a single pull of the trigger (press of the button?) it fires several rounds in quick succession.
For example on 
0 it would fire a 3 round burst from the nose weapon pod, with 0.25s delay between shots and a 0.5s cooldown before the next burst (with 200 damage per bolt, this would be equal to 600 damage per burst).
Subsequent firepower levels would increase the number of active weapon pods, increase the number of rounds fired per burst, decrease time between shots and/or decrease the delay between bursts.
Old version:
