Pubcasters won three of the 2012 duPont-Columbia Silver Baton Awards announced this morning by Columbia University: Nova, the PBS science series produced at WGBH in Boston, won for “Japan’s Killer Quake”; WNYC reporter Alisa Chang, for her two-part investigative series on the New York Police Department, “Alleged Illegal Searches by the NYPD”; and Detroit Public Television, for “Beyond the Light Switch,” a documentary series produced and directed by Ed Moore and reported by David Biello of the Scientific American. The duPont jury presented a Finalist Award to WNYC’s Radio Rookies for “Coming Up in 2011,” a collection of “unflinching self-portraits” by teenagers from Staten Island.