The Sensex at the Bombay Stock Exchange rose 53 points, or 0.3 percent, to close at 17,637, today, amid firm Asian markets. The Nifty at the National Stock Exchange gained 20 points, or 0.4 percent, to 5,359. But in the broader market, the BSE Midcap index and the Smallcap index lost 0.1 percent, each.