Follow-up observations of the Quasi-Periodic-Eruption active galaxy GSN 069

One of the most unexpected and surprising results from recent XMMNewtonobservations of active galactic nuclei (AGN) is the discovery of a new Xrayvariability pattern from the active galaxies GSN 069 and RX J1301.9+2747, bothreported by our team recently. In both cases, the Xray light curve exhibitsrecurrent Xray bursts of high amplitude (up to a factor of 100 with respect tothe stable quiescent level) dubbed quasi periodic eruptions (QPEs). QPEs havebeen observed in GSN 069 over the course of about one year, and the latestobservations show that the phenomenon has apparently disappeared. We proposehere two relatively short XMMNewton observations of GSN 069 separated by about6 months to clarify whether QPE disappearance is transient or permanent. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]