Gold edged lower on Friday as the market nervously awaited US nonfarm payrolls data, heading for its longest weekly losing streak in more than six months as equities firmed and optimism grew about the US economy. Spot gold slipped 0.05 percent to $1,286.39 an ounce by 0708 GMT. The metal is down 0.5 percent for the week, on track for a third straight weekly loss. That would be its longest weekly losing stretch since August-September. Prices were trading in a tight $3.86 range - the smallest trading band since December 25.