In a statement released via Connacht, Hansen said he “let my emotions get the better of me” after the Leinster match.
“On reflection, my comments to the media were ill-advised and fell far below the standards I expect of myself, and what the sport expects of its players,” he said.
“I want to apologize to the match officials for any inconvenience my comments may have caused. Our matches are built on mutual respect and I did not show that after the match.
“I also want to apologize to the URC, and fully accept the findings of the Independent Disciplinary Committee.
“I love Connacht, and I love rugby. Moving forward, I will channel all my energy and passion into representing my county and my country to the best of my ability – on and off the field.”
Hansen has been one of Ireland's standout players since joining the squad in 2022, scoring 13 tries in 27 international appearances, but missed last year's Six Nations tournament through injury.
The news will be welcomed by interim Ireland coach Simon Easterby, who lost Tom O'Toole for the England and Scotland matches after the defeat. Ulster prop banned for six matches For a serious liquidation in last month's match with Munster.