The Panthers' undefeated season came to an end with a 13-20 loss in Atlanta, dropping their record to 14-1. Carolina started off well with a Newton rushing TD, but Atlanta proved to be too much at home, culminating in a long touchdown pass from Falcons QB Matt Ryan to WR Julio Jones. The Falcons defense swarmed the field all day, as the Panthers couldn't manage a touchdown for the rest of the game. As a result, Atlanta pulled off the upset. Despite the loss, their only one of the regular season, Carolina kept both its playoff spot and division title.
Question: How many weeks into the season did this game occur?
Answer: 15