I may have scrolled down too quick, but I didn't see Pearl v. G'town 1986. That may not "officially" be one as I believe there was 5 or so sec left.
Another G'town buzzer beater was in '81 by Marty Headd. Danny Schayes had 23 boards in that game. That was when Danny was playing like the best center in the country the last 2 months of the year.
In 1980 a week after having our collective psyches crushed by G'town, Hal Cohen drove nearly the length of the floor , dished to a driving Louis Orr for a layup at the buzzer to beat St John's at St. Johns. We were 14-0 and 21-1 at one point, and soon we were losing our final home game at Manley. We recovered enough to make the regionals but lost in the East Regional opening game vs. Iowa. What a peak and valley year that was. That was a great team but I always look back at it with as a grey scene, feeling empty. The heartbreak outweighed the joy.