By Ayai Tomisawa TOKYO, Jan 22 (Reuters) - The Nikkei share average dropped 0.8 percent, erasing gains made immediately after the Bank of Japan set a 2 percent inflation target and made an open-ended commitment to buy assets. The Nikkei shed 85.88 points to 10,661.86 after jumping to as high as 10,859.42 after the BOJ's outcome. The central bank doubled its inflation target to 2 percent and adopted an open-ended commitment to buy assets, cheering the market. The initial rise prompted profit-taking in the market that has risen since mid-November. "The bank provided the market with what it had expected, so it cheered the outcome at first, but none of those moves was extremely surprising," said a fund manager at a U.S. asset management firm. "It's good that the bank said it will buy assets without setting a deadline, but it could also be perceived as 'failing to give out the timing' so that it can postpone such actions if it wants to," he said. But analysts said the BOJ's decisions were generally welcomed by investors, and in the longer term, the Japanese market will likely continue attracting buying. "Now that the central bank proved that it is committed, so even though there is a correction, the Nikkei may start rising again," said Hikaru Sato, a senior technical analyst at Daiwa Securities. "The 11,000-line is still in sight." Investors had been waiting for the BOJ decision since mid-November when Shinzo Abe, then the leading candidate to win a general election and now prime minister, began calling for aggressive easing, helping to weaken the yen. That boosted exporters and sparked a 26 percent rally in the Nikkei. The broader Topix slipped 0.9 percent to 897.23.