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Context. The APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) is thefirst systematic survey of the inner Galactic plane in the sub-millimetre. Theobservations were carried out with the Large APEX Bolometer Camera (LABOCA), anarray of 295 bolometers observing at 870 microns (345 GHz). Aims. Here wepresent a first version of the compact source catalogue extracted from thissurvey. This catalogue provides an unbiased database of dusty clumps in theinner Galaxy. Methods. The construction of this catalogue was made using thesource extraction routine SExtractor. We have cross-associated the obtainedsources with the IRAS and MSX catalogues, in order to constrain their nature.Results. We have detected 6639 compact sources in the range from 330 < l < 21degrees and |b| < 1.5 degrees. The catalogue has a 99% completeness for sourceswith a peak flux above 6 sigma, which corresponds to a flux density of ~0.4Jy/beam. The parameters extracted for sources with peak fluxes below the 6sigma completeness threshold should be used with caution. Tests on simulateddata find the uncertainty in the flux measurement to be ~12%, however, in morecomplex regions the flux values can be overestimated by a factor of 2 due tothe additional background emission. Using a search radius of 30" we found that40% of ATLASGAL compact sources are associated with an IRAS or MSX pointsource, but, ~50% are found to be associated with MSX 21 microns fluxes abovethe local background level, which is probably a lower limit to the actualnumber of sources associated with star formation. Conclusions. Althoughinfrared emission is found towards the majority of the clumps detected, thiscatalogue is still likely to include a significant number of clumps that aredevoid of star formation activity and therefore excellent candidates forobjects in the coldest, earliest stages of (high-mass) star formation.

ATLASGAL - Compact source catalogue: 330 < l < 21 degrees