The GunCon (also known as G-Con-45) is an official controller released by Namco. It is the first GunCon model, followed by GunCon 2 and GunCon 3. The controller was bundled with the 1997 console port of Time Crisis.
Huh, I wonder if there's a way to make a "light gun" style game and the phone's built-in send to TV function, and you're shooting whatever your phone camera is pointing at on the TV screen? Is it possible to have the phone display something different than what it's sending to the TV? Honestly, committing to the fact it's a camera you're aiming with could make for a fun Fatal Frame or Pokemon Snap type game...
I have a guncon3 somewhere around. It works with a pair of sensors placed on top of the TV, like in the PS Eye and XBox Move era. No CRT was required for that.
The length of the cable between the sensors was made for something like a 40" screen though, so if you play on a larger screen they sit a bit toward the center instead of in the corners where they are supposed to be.