OPTICAL AND X-RAY OBSERVATIONS OF THE EUV-SELECTED SEYFERT-GALAXY RE J2248-511 - A TRUE SOFT-X-RAY EXCESS AGN

Optical and soft X-ray (0.1-2.0 keV) data of a rare, EUV-selected Seyf ert 1 galaxy, RE J2248 - 511, are presented. Fits to the soft X-ray sp ectrum suggest that either (a) this AGN has been viewed through a 'hol e' in the local Galactic column density (N-H < 10(20) Cm-2) Or (b) RE J2248 - 511 exhibits a strong ultrasoft X-ray excess below similar to 0.25 keV. The EUV (0.09-0.21 keV) count rate inferred from new pointed ROSAT PSPC data is twice that originally measured by the Wide Field C amera during the ROSAT All-Sky Survey and, in scenario (b), suggests a n ultrasoft X-ray excess which was substantially weaker during the All -Sky Survey observation. The soft X-ray flux also weakens by 14 per ce nt during the pointed PSPC observation (a time-scaIe of 16 h), but the re are no significant spectral changes.