The Bombay Stock Exchange benchmark Sensex today opened higher by over 197 points on emergence of fund buying in realty, banking and capital goods stocks, coupled with a firming trend in other Asian markets.The 30-share index rose by 197.37 points, or 1.01 per cent, to 19,614.86 points in opening trade. The Sensex had lost 84.62 points in Thursday's choppy session.Similarly, the broad-based National Stock Exchange index Nifty gained 52.35 points, or 0.82 per cent, to 5,881.05 points.