Abstract
The X-ray Observatory XMM-Newton is in orbit since December 1999. We will report on the current status of the in-flight spectral calibration of the EPIC-pn camera. Using the internal calibration source and line spectra of supernova remnants the calibration of the energy scale has been monitored over the first years of operations. Continuum spectra of celestial objects like Active Galactic Nuclei or isolated neutron stars were used for cross-calibrating the instruments. We report on recent improvements in the spectral calibration as well as still existing problems.
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