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Aims: Pointed observations with XMM-Newton provide the basis for creatingcatalogues of X-ray sources detected serendipitously in each field. This paperdescribes the creation and characteristics of the 2XMM catalogue. Methods: The2XMM catalogue has been compiled from a new processing of the XMM-Newton EPICcamera data. The main features of the processing pipeline are described indetail. Results: The catalogue, the largest ever made at X-ray wavelengths,contains 246,897 detections drawn from 3491 public XMM-Newton observations overa 7-year interval, which relate to 191,870 unique sources. The catalogue fieldscover a sky area of more than 500 sq.deg. The non-overlapping sky area is ~360sq.deg. (~1% of the sky) as many regions of the sky are observed more than onceby XMM-Newton. The catalogue probes a large sky area at the flux limit wherethe bulk of the objects that contribute to the X-ray background lie andprovides a major resource for generating large, well-defined X-ray selectedsource samples, studying the X-ray source population and identifying rareobject types. The main characteristics of the catalogue are presented,including its photometric and astrometric properties .

The XMM-Newton Serendipitous Survey. V. The Second XMM-Newton Serendipitous Source Catalogue