Description
The Herschel Astrophysical Terahertz Large Area Survey (Herschel-ATLAS) is a survey of 550deg^2^ with the Herschel Space Observatory in five far-infrared and submillimetre bands. The first data for the survey, observations of a field 4x4deg^2^ in size, were taken during the Science Demonstration Phase (SDP), and reach a 5{sigma} noise level of 33.5mJy/beam at 250um. This paper describes the source extraction methods used to create the corresponding SDP catalogue, which contains 6876 sources, selected at 250um, within ~14deg^2^.
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