No, it's a module that can be bought and fitted, but you need to do Guardian related stuff first. You'll also need quite a bit of Guardian materials and a module blueprint as well.What's a guardian booster. It's that an engineer mod
If you go to Inara, click the 'Outfitting' on the left, then click 'Technology Broker' just below it, then change the selection from 'Human' to 'Guardian Modules' you'll see what you need to get one.
As has been said previously, Inara is a valuable resource, and of course these forums.
o7