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Pohlen, M. Prescott, M. Seibert, P. Norberg, P. Panuzzo, P. Temi, P. van der Werf, R. Hopwood, R. J. Ivison, R. J. Tuffs, R. Sharp, S. Bamford, S. Buttiglione, S. Croom, S. Eales, S. Fleuren, S. J. Maddox, S. P. Driver, W. Sutherland","submitted_at":"2010-07-29T16:38:30Z","abstract_excerpt":"We present a technique to identify optical counterparts of 250 um-selected sources from the Herschel-ATLAS survey. Of the 6621 250 um > 32 mJy sources in our science demonstration catalogue we find that ~60 percent have counterparts brighter than r=22.4 mag in the Sloan Digital Sky Survey. Applying a likelihood ratio technique we are able to identify 2423 of the counterparts with a reliability R > 0.8. This is approximately 37 percent of the full 250 micron catalogue. 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