Mumbai: Buoyed by the progress of Goods and Services Tax (GST) bill, the key Indian equity market indices opened in green on Thursday. The Sensitive Index (Sensex) of the BSE, which had closed at 28,024.33 points on Wednesday, opened higher at 28,108.78. Minutes into trading, it was quoting at 28,066.22 points, up 41.89 points, or 0.15 per cent. At the National Stock Exchange (NSE), the broader 51-scrip Nifty, which had closed at 8,615.80 points, opened at 8630.80 points. Minutes after it was trading at 8,628 points, up 12.20 points or 0.14 per cent. On Wednesday, the Sensex was up 47.81 points after earlier hitting its highest since August 10, 2015 while the Nifty too gained 25.15 points after earlier hitting its highest since April 17, 2015. Both indices were upon the positive expectation of Goods and Services Tax (GST) that it will get passed in the current monsoon session.