Ship Name: Terran Naval Yards G-564 missile gunboat (Confederate Gunboat)
Cost: 900,000 Credits

Speed: 250
Accel: Good
Turn: Average
Shields: 20
Armor: 5
Guns: Maximum of 3
Turrets: None
Space: 5 tons
Cargo: 5 tons
Fuel: 3 jumps
Length: 12 m
Mass: 15 tons
Crew: 2

Standard weapons:
     2 Laser Cannons
     1 Missile Rack + 4 Missiles
     1 Rocket Launcher + 2 Heavy Rockets

My opinion:  Essentially a Patrol Ship with a Rocket Launcher, the Gunboats price just doesn't make it worth buying.  See Manta

Computer controled:  These ships are twice as annoying as Patrol Ships.  They're easy to kill but will always get off their missles.  Avoid close contact with  Gunboats, they'll always launch their rockets at you.  If you're able to render one of these disabled (which is hard — you'll probably end up blowing it up) they're very easy to capture and make a good addition to your fleet.