Nikkei stock index surges 5.15 percent by close

Nikkei closed up 5.12%, buoyed by continuing gains on Wall Street, after the Nikkei slipped to 26-year lows last week. The Japanese government announced last month it is to launch another stimulus package.Japan's Nikkei stock index closed up 5.15 percent on Friday, its biggest gain this year, after Wall Street extended a winning streak thanks to rare good economic news.     The Nikkei-225 index climbed 371.03 points to end at 7,569.28. The broader Topix index of all first-section shares gained 23.37 points, or 3.33 percent, to finish at 724.30.