[UNPUBLISHED]

Gary “Michael Gatliff pleaded guilty to willfully and knowingly transmitting in interstate commerce a telephone communication containing a threat to injure a person, in violation of 18 U.S.C. § 875(c). The district court 1 sentenced him to 18 months imprisonment and 3 years supervised release. On appeal, he argues that the district court should have granted his motion for a downward departure based on his reduced mental capacity. Given the *605 district court’s explicit recognition of its authority to depart, its decision not to do so is unreviewable. See United States v. Koons, 300 F.3d 985, 993-94 (8th Cir. 2002). Accordingly, we affirm.