The Sensex opened with a positive gap of 43 points at 19,827, but soon slipped into red to a low of 19,735. Selective buying in the market saw the index rebound into positive zone and rally to a high of 19,984 - up 249 points from the day's low.The index, thereafter, exhibited range-bound movement and finally settled (provisional) with a gain of 63 points at 19,847.