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.
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.
Can't remember the names, but there's a few modern tales on these you can buy, but are quite expensive. Thought about buying one a few years back, but the setup is complex with modern displays, and I was lazy about dealing with it.