The Sensex opened with a positive gap of 41 points at 11,960. The index touched a high of 11,972, and soon slipped into the negative zone.The index is now down 13 points at 11,906.Hero Honda has advanced nearly 2% to Rs 750. Reliance Communications has surged 1.5% to Rs 321.Larsen & Tourbo has added 1% to Rs 2,585.HDFC Bank has declined over 1% to Rs 840. Tata Steel and HLL are down around 1% each at Rs 520 and Rs 239, respectively.