UPDATE 1-NFL-49ers upset Falcons to qualify for Super Bowl

(Adds details)

ATLANTA, Jan 20 (Reuters) - The San Francisco 49ers beat the Atlanta Falcons 28-24 on Sunday to win the NFC Championship at the Georgia Dome and qualify for next month's Super Bowl in New Orleans.

The 49ers will play the winner of Sunday's AFC Championship, between the New England Patriots and Baltimore Ravens, in the National Football League's championship game on Feb. 3.

The top-seeded Falcons led 17-0 early in the second quarter and by 10 points at halftime but did not score a single point in the second half.

The 49ers scored two unanswered touchdowns, snatching the lead for the first time in the final quarter with a touchdown from Frank Gore as the 49ers completed the biggest comeback in an NFC Championship game.

The 49ers are one of the most successful franchises in American football, winning the Super Bowl five times, second only to the Pittsburgh Steelers, with six titles. San Francisco's last victory was 18 years ago. (Reporting by Simon Evans; Writing by Julian Linden in New York; Editing by Frank Pingue)