A Sacramento couple is in jail Wednesday night on charges related to allegedly hiding an explosive device outside the downtown federal courthouse last weekend. The FBI on Wednesday arrested Matthew Fraticelli, 30, and Stephanie Ann Shinn, 35, of South Sacramento on charges of attempted arson of a federal facility and possession of an unregistered destructive device. Wednesday afternoon, the two had an initial appearance in federal court at the Robert T. Matsui Federal Courthouse at 501 I St. -- the same building where the device was found. Fraticelli was convicted about two years ago in the state court system for possession of a destructive device, said the FBI’s Sacramento Division Sp