By Julian Linden NEW ORLEANS, Feb 4 (Reuters) - The National Football League was still working with New Orleans officials on Monday to determine what caused the power outage at Sunday's Super Bowl at the Superdome, so far dismissing any connection with the Beyonce halftime show. With a record U.S. television audience watching along with viewers in 180 countries, about half the stadium lights went dark early in the second half of the game, in which the Baltimore Ravens defeated the San Francisco 49ers, 34-31.

By Simon Evans NEW ORLEANS, Feb 3 (Reuters) - The San Francisco 49ers came close to a record Super Bowl comeback but were left distraught after failing to convert three times from the five-yard line with the Lombardi Trophy within their grasp. "Five yards short, all the work we did in the offseason, the whole entire season, everything came down to five yards and we weren't able to get it done," said dejected 49ers tackle Joe Staley.

Feb 3 (Reuters) - List of National Football League Super Bowl champions. Feb. 3, 2013 - Baltimore Ravens 34, San Francisco 49ers 31 Feb. 5, 2012 - New York Giants 21, New England 17 Feb. 6, 2011 - Green Bay 31, Pittsburgh 25 Feb. 7, 2010 - New Orleans 31, Indianapolis 17 Feb. 1, 2009 - Pittsburgh 27, Arizona 23 Feb. 3, 2008 - New York Giants 17, New England 14 Feb. 4, 2007 - Indianapolis 29, Chicago 17

New Orleans will return to the center of US sport's grandest stage by hosting Super Bowl 47 on Sunday, a major milestone on the southern city's road to recovery from Hurricane Katrina. It is the first Super Bowl here since the Big Easy was hit in 2005 by the massive storm, which killed close to 2,000 people and caused billions of dollars of damage in four American states.