This equipment is listed in Interstellar Operations on page 58 on the Universal Technology Advancement Table, in among the ATOW support weapons.
The only possible reference to it outside that chart I could find was the TAG Troops entry in Tactical Operations on page 341.
What are the stats for this in ATOW (or what book is it actually in)? Especially it's weight, it's power source's weight, and how many power points does it use per shot? I would guess it would use the same 3kg power packs that all the support lasers use, but would like confirmation on it.
Also the Universal Technology Advancement Table on pages 54-58 list every single ATOW weapon's page reference as TM page 273, including the ones that are not in TM at all, but are from ATOW Companion.