FightOrFlight

Referees in Ireland
The offence as described wasn't in the in goal area but rather just short of the try line. Penalty at place of infringement - although often incorrectly moved to the five metre line in confusion with a penalty against the attacking team.
[LAWS] 21.2 (a) The kicker must take the penalty or free kick at the mark or anywhere behind it on a line through the mark. If the place for a penalty or free kick is within 5 metres of the opponents’ goal line, the mark for the kick is 5 metres from the goal line, opposite the place of infringement.[/LAWS]