088526

We have discovered an unprecedentedly long ( and amp amp amp gt 14 yrs) X-ray tidal disruption event (TDE) candidate with several interesting signatures of super-Eddington accretion: quasi-soft X-ray spectra Eddington-limited luminosity and later transition to the thermal state with much softer spectra. One important prediction of our identification of the source as a super-Eddington accreting TDE is the significant decrease of the source luminosity and the softening of the X-ray spectra in the new few years. Therefore we request one more XMM-Newton observation of this event in AO20 two years after the last monitoring when it is in a phase of faster decay. Continuing monitoring is critical for the modeling of the event and confirmation of its nature as the most spectacular TDE known. [truncated! Please see actual data for full text]