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We present an in-flight calibration of the ROSAT PSPC using the incidentspectra of the hot white dwarf HZ43 and the polar AM Her. We derive an absoluteflux calibration of the PSPC using the accurately known soft X-ray spectrum ofHZ43. Corrections to the PSPC response matrix are derived from a comparison ofpredicted and observed PSPC spectra of HZ43, supplemented by results for AMHer. The calibration of the PSPC for photon energies E < 0.28 keV is found tobe accurate to better than 5% refuting earlier reports of a majormiscalibration. Our corrections to the detector response matrices removesystematic residuals in the pulse height spectra of soft sources.

Soft X-ray in-flight calibration of the ROSAT PSPC