The new referee aid was installed at all Sky Bet Championship grounds this summer after a successful year-long trial in the Premier League last season.
Andreas's late header, his first goal in a Brentford shirt, was parried by Forest goalkeeper Jordan Smith but crept over the line with referee James Linington awarding the goal based on the signal received from the Goal-line technology.
You can view the moment of Griffin Park history from yesterday's 4-3 defeat to Forest below.