10 Dec, 12:23
Ireland's John Lacey will referee his first ever RBS 6 Nations match in February, while Alain Rolland is also included in the Elite Panel in what is his last season.
Replacements: David Rowley, Brendan Cullinane, Mark Hanrahan, Conor Hartigan, Geoff Ryan.
Replacements: John Sheerin, Kevin Griffin, Jason Cronin, Mike Culhane, Mark Leonard.
Out-half Jamie Gavin landed Garryowen's first penalty after eight minutes but it was all square after 27 minutes when his opposite number Rob Guerin was on target for the under-fire visitors.
Guerin started at out-half but moved to his more regular scrumhalf position when Mike D'Arcy was injured in the second half.
A big improvement was expected in the second period but it remained a battle of the place-kickers all the way.
Gavin kicked four in the end for Garryowen and his last strike was eleven minutes from the end which left it 12-6 after Guerin had landed his second Shannon penalty.
Shannon, whose coaches Stephen Keogh and Eoin Cahill stepped down last Monday, needed a try if they were to snatch victory but they could not breach a strong Light Blues defence.
There were notable performances from Munster's Ronan O'Mahony and Luke O'Dea at full-back for their respective sides, the pair both swept up well in defence and threatened with ball in hand on occasion.
The result leaves Garryowen just a single point behind table toppers Lansdowne, while the losing bonus point will give Shannon something to build on for next weekend's home clash with defending champions St. Mary's.
Referee: Paul Haycock (IRFU)