The 23-year-old was released by Morton this summer after only managing three games last season.
Previous to that the Glasgow born defender was a regular with both Morton and previous club Hamilton Academicals.
In his youth, the central defender was with Bolton, Nottm Forest and Glasgow Rangers (despite being a Celtic fan).
Gaughan impressed Slade by travelling all the way down from Scotland for a brief chat and to ask for a trial.
Town's new boss was taken back by his enthusiasm that he offered him a trial through pre-season.
With Slade set to play three central defenders across the back next season, Gaughan could well have arrived at the right time.
Stats:
Height: 6:02
Weight: 14'7"
Apperances to date: 117 (6)
Goals to date: 5