That´s probably Ballytrasna. An area in the town of Boyle. I seem to recall Pat Brennan (North Roscommon IRA) was from Ballytrasna, too. Maybe a relative?
My great grand aunt Margeret Brennan nee Bolton, married John Brennan in 1926 Boyle Roscommon he was a postman from Ballytrosna
the birth cert is confusing she was chrisend Maryane