Forty years after a powerful bomb exploded on the Madison campus, Leo Burt remains the last fugitive wanted by the FBI in connection with radical anti-Vietnam War activities. He vanished almost immediately after the bombing, and is now what one former prosecutor calls “Wisconsin?s state ghost.” This week, the university will mark the anniversary by opening a recording booth in the library, where people can relate their memories of the event for inclusion in the university archives and in a documentary theater project. A small plaque honoring Robert Fassnacht, the 33-year-old scientist killed in the blast, is the only permanent sign on campus that the bombing happened.