After opening with a positive gap of 110 points at 15,467, the Sensex slipped into negative zone to a low of 15,331 - down 136 points from the day's open. The index soon rebounded into positive zone, and displayed positive trend for the rest of the day. Realty stocks led the rally followed by metal and energy stocks.The Sensex finally ended (provisional) with a gain of 436 points at 15,793.The NSE Nifty was up (provisional) 133 points at 4,757.