Glenavon dropped to sixth in the Irish Premiership table after they fell to a home defeat to Ballinamallard on Saturday.
In what was a largely drab and uneventful game at Mourneview Park, the Lurgan Blues squandered their best chance when Paddy McCourt saw his penalty saved by the visitors’ goalkeeper Jack McGrath midway through the second half.
Just as the game looked to be heading towards a stalemate, Adam Lecky was brought down in the area deep into injury time, with the referee awarding a penalty for the offence.
Lecky stepped up to convert his spot kick and hand his side their first win of the campaign.
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Ulster secured the home win needed against Bath to qualify for the Heineken Champions Cup quarter-finals for a second consecutive season.
Glentoran have moved to top of the NIFL Premiership table, after their league rivals Cliftonville and Linfield both lost out.
Staying dry and clear, leading to a widespread frost across the Province, also towards dawn the chance of a few freezing fog patches.