This release from the Sox:
The Boston Red Sox today acquired right-handed pitcher Miguel Celestino from Seattle, completing the January 7 trade that sent first baseman Casey Kotchman to the Mariners in exchange for infielder Bill Hall and cash.
Celestino, 20, went 5-3 with a 4.73 ERA (35 ER/66.2 IP) in 13 games/12 starts for the Rookie-level Peoria Mariners of the Arizona League in 2009, his first professional season in the United States. He tossed at least 5.0 innings in 10 of his 13 appearances and had a 13.0-inning scoreless streak from August 11-16. He pitched in the Dominican Summer League from 2007-08 and was originally signed by Seattle as an international free agent on December 16, 2006.