Ben Cairns was the toast of the Gunners as he snapped up the try which inspired his side to a morale-boosting 20-15 Magners League triumph over the champions.
Cairns was making his first competitive start on the pro stage - but he took his crucial score like an old hand.
Edinburgh made a jittery start, allowing the visitors to snatch the early initiative with a penalty by veteran stand-off David Humphreys for offside.
Ulster continued to look the more hungry outfit, however the Gunners broke their duck in the eighth minute thanks to a slick drop-goal by Phil Godman.
Godman's effort had a settling effect on the capital brigade and they began to string together some potent-looking moves.
They could not make an immediate breakthrough, but skipper Chris Paterson banged over a penalty to at least enable them to get their noses in front.
Edinburgh maintained the momentum and got further reward when Paterson repeated the feat, opening up a useful six-point gap in the process.
Ulster came more into the picture with their powerful forwards posing problems for their home rivals.
The mounting pressure resulted in the Gunners giving away a series of penalties and Humphreys took full advantage by slotting two in quick succession to tie up the contest once again.
Edinburgh enjoyed a let-off when a Humphreys drop-goal bid was off-target, and they capitalised in the build-up to the break.
First, Paterson completed his penalty treble - then Cairns celebrated his full debut with the try that mattered.
Ally Hogg inflicted the initial damage with a surge up the centre of the field.
Dougie Hall and Matt Mustchin provided the link before Cairns underlined his speed and strength to shake off two challenges and plough over in the corner.
Ulster were in urgent mood after the restart and within two minutes Humphreys had collected his fourth penalty to narrow the gap to five.
He was on target again midway through the half to set up a tension-packed finale. But captain cool Paterson held his nerve to bang over the kick that made sure of the glory for the Gunners.
