Breaking a two-day fall, domestic stock markets started Monday's session on a positive note led by buying across sectors amid strength in Asian peers. The Sensex index rose as much as 254.83 points in early deals to 39,649.47, and the NSE Nifty benchmark climbed to 11,860.85, up 72 points from the previous close. Buying was seen across sectors by banking, auto and metal shares. Analysts say any major announcements in the upcoming Budget will be monitored closely.