London ( CNN ) -- WikiLeaks founder Julian Assange was granted bail Tuesday after a hearing at Westminster Magistrate 's Court in London , but a lawyer representing Swedish prosecutors immediately filed an appeal . That means Assange will remain in jail until the next hearing , which should be before the High Court within 48 hours , lawyers said . The 39-year-old Australian handed himself over to London police last week to answer a European arrest warrant over alleged sex crimes in Sweden . Assange is facing accusations of rape , sexual molestation and illegal use of force in separate incidents in August in Stockholm . He could be sentenced to two years in prison if convicted . His lawyers deny the allegations and have vowed to fight any attempts at extradition . The magistrate agreed to grant bail Tuesday after Vaughan Smith , a former British army officer who founded London 's Frontline Club , testified that Assange could stay at his mansion in Suffolk . Smith will keep Assange `` if not under house arrest , at least under mansion arrest , '' said defense attorney Geoffrey Robertson . At that , Assange , dressed in a white shirt and a blue jacket and sitting in a glassed-in corner of the court with three security guards , smiled wryly . The magistrate set bail at 200,000 pounds ( about $ 315,000 ) plus two sureties of 20,000 pounds each ( about $ 31,500 ) . Assange 's passport must remain with police , and he will be monitored by a location tag . Assange must be at Smith 's mansion , about two hours outside of London , for at least four hours overnight and four hours during the day . He will be required to report to police daily between 6 and 8 p.m . The next court hearing was scheduled for January 11 . After the conditions were set , Assange stood and said , `` I understand , '' with a neutral expression . His mother Christine told reporters after the hearing that she was `` very , very happy '' and thanked `` the media for all your support of my son . '' But several hours later , Sweden filed its appeal . Outside the court , about 100 people demonstrated in support of Assange , holding signs saying `` Julian Assange is a political prisoner '' and `` Why are you shooting the messenger ? '' and `` This is not 1984 . '' During the hearing , Assange 's team of attorneys argued that since he is only wanted for questioning and has not been formally charged , he is presumed innocent . The magistrate agreed . But , said Gemma Lindfield , the attorney representing the Swedish prosecution , `` The court has already found that Mr. Assange is a flight risk . Nothing has changed in this regard . '' She said if the alleged offenses had occurred in Britain , `` it undoubtedly would have been a charge of rape in this jurisdiction . '' Robertson disputed that . Celebrity supporters of Assange at the hearing included Bianca Jagger , who sat next to Fatima Bhutto , niece of the late Pakistani politician Benazir Bhutto and current Pakistani President Asif Ali Zardari , and prominent left-wing journalist John Pilger . Socialite Jemima Khan came to court but it is not clear she got into the very crowded hearing room . Many were turned away for lack of space . Judge Howard Riddle denied Assange 's first request for bail at a hearing on December 7 on the grounds that there was a risk he would fail to surrender . On Tuesday , he cited four reasons for his insistence a week earlier on keeping Assange in jail : his lack of fixed residence , confusion over when and how he last entered the United Kingdom , the evidence against him in Sweden , and a dispute over whether Assange is wanted only for questioning or for prosecution . Smith 's offer of his mansion satisfied Riddle on the question of an address , and testimony from someone who arrived in the U.K. with Assange from Switzerland answered that question , he said . He said he was not taking a position on the Swedish evidence against Assange , and that a future hearing would have to determine whether Assange was wanted for questioning or prosecution . WikiLeaks ' release of thousands of secret U.S. diplomatic and military documents is under criminal review in the United States . Almost half of Britons believe that the sex charges against Assange are `` an excuse '' to keep him in custody so that the U.S. government can prosecute him for releasing secret diplomatic cables , a new poll for CNN shows . The ComRes poll of British opinion , released Monday on the eve of Assange 's bail hearing , finds that 44 % of respondents in Great Britain believe that Sweden 's sex charges are just a pretext , while only 13 % flatly disagree . The remaining 43 % say they do n't know . Last week , U.S. Attorney General Eric Holder said he had authorized `` significant '' actions related to a criminal investigation into WikiLeaks ' publication of the materials but has declined to elaborate . WikiLeaks inflamed U.S. authorities last month by publishing the first of a large group of confidential U.S. diplomatic cables . Only a small fraction of the 250,000 U.S. State Department documents have been released and more are being published daily . U.S. authorities and other Western leaders say the documents ' publication threatens lives and national security . WikiLeaks and its supporters say that the public has a right to know what is going on behind diplomatic doors . CNN 's Richard Allen Greene , Atika Shubert and Hilary Whiteman contributed to this report .
NEW : High Court to hear bail appeal within 24 hours . Julian Assange 's mother thanked the public for their support . About 100 people demonstrate support for Assange outside court . Assange is convicted of sex crimes in Sweden .