The Sensex at the Bombay Stock Exchange gained 121 points, or 0.6 per cent, to close at 19,445, amid rising Asian markets, on Friday. The Nifty at the National Stock Exchange rose 38 points, or 0.7 percent, to 5,908.Stock markets in Japan, China, Hong Kong, South Korea and Singapore gained between 0.2 percent and 1.2 percent.