With Ulster losing Edinburgh were able to move into second place with a fine bonus point away win over Leinster. Alasdair Strokosch scored the final try in the closing minutes to secure the 27-13 vivtory.
The Gunners are just four points behind Munster, who scored an 18-16 win at Cardiff Arms Park over the Blues. The league leaders had led 18-9 before a late Marc Stcherbina try had secured a bonus point for the Blues.
In Glasgow Colin Gregor kicked 20 points as the Warriors put basement side Connacht to the sword with a 30-15 victory.
In the round's final game The Dragons lead 13-0 after half an hour but were pushed all the way by Border Reivers who only just fell short as the Welsh side eventually ran out 20-16 winners.