5:52pm: Penn was DFA'd in order to make room on the roster for lefty Brian Burres, writes Dejan Kovacevic of the Pittsburgh Post-Gazette. Burres has a 6.01 ERA with 5.7 K/9 and 7.1 BB/9 in 265 big league innings.
The 25-year-old Penn appeared in three games for Pittsburgh this year, giving up eight hits and eight runs in just 2.1 innings. He walked three and struck out no one. Penn's Triple-A numbers are strong; he's posted a 3.85 ERA and a 7.5 K/9 in 278.1 innings at the level.