Here is the location that I found on the Irish Midlands site.
BURROS-in-OSSORY, a market and post-town, in the parish of AGHABOE, barony of UPPER OSSORY, QUEEN'S county, and province of LEINSTER, 13 miles (S.W. by W.) from Maryborough, and 53 miles (S.W. by W.), from Dublin; containing 770 inhabitants.
Researching Fitzpatrick, Dooley, Marnell, and Brophy in County Laois.