  The eROSITA X-ray telescope on board the Spectrum-Roentgen-Gamma (SRG)
spacecraft observed the field of the UKIDSS Ultra-Deep Survey (UDS) in
August-September 2019, during its flight to Sun-Earth L2 point. The resulting
eROSITA UDS (or eUDS) survey was thus the first eROSITA X-ray imaging survey,
which demonstrated the capability of the telescope to perform uniform
observations of large sky areas. With a moderate single-camera exposure of 150
ks, eUDS covered ~5 deg^2 with the limiting flux ranging between 4E-15 and
5E-14 erg/s/cm^2, in the 0.3-2.3 keV band. We present a catalogue of 647
sources detected at likelihood >10 (~4 sigma) during the eUDS. The catalogue
provides information on the source fluxes in the main energy band 0.3-2.3 keV
and forced photometry in a number of bands between 0.3 and 8 keV. Using the
deeper 4XMM-DR12 catalogue, we have identified 22 strongly variable objects
that have brightened or faded by at least a factor of ten during the eROSITA
observations compared to previous observations by XMM-Newton. We also provide a
catalogue of 22 sources detected by eROSITA in the hard energy band of 2.3-5
keV.
