Gaining for the second straight session, the Sensex at the Bombay Stock Exchange climbed 260 points, or 1.6 percent, to 16,677, on Tuesday, in line with rising Asian markets.The Nifty at the National Stock Exchange rose 81 points, or 1.7 percent, to 5,001.Stock markets in Japan, Hong Kong and South Korea rose between 0.8 percent and 1.7 percent, following encouraging US economic data.