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The ultrasoft X-ray flare 2XMMi J184725.1-631724 was serendipitously detectedin two XMM-Newton observations in 2006 and 2007, with a peak luminosity of6X10^43 erg/s. It was suggested to be a tidal disruption event (TDE) becauseits position is consistent with the center of an inactive galaxy. It is theonly known X-ray TDE candidate whose X-ray spectra showed evidence of a weaksteep powerlaw component besides a dominant supersoft thermal disk. We havecarried out multiwavelength follow-up observations of the event. Multiple X-raymonitorings show that the X-ray luminosity has decayed significantly after2011. Especially, in our deep Chandra observation in 2013, we detected a veryfaint counterpart that supports the nuclear origin of 2XMMi J184725.1-631724but had an X-ray flux a factor of ~1000 lower than in the peak of the event.Compared with follow-up UV observations, we found that there might be someenhanced UV emission associated with the TDE in the first XMM-Newtonobservation. We also obtained a high-quality UV-optical spectrum with the SOARand put a very tight constraint on the persistent nuclear activity, with apersistent X-ray luminosity expected to be lower than the peak of the flare bya factor of >2700. Therefore, our multiwavelength follow-up observationsstrongly support the TDE explanation of the event.

Multiwavelength Follow-up Observations of the Tidal Disruption Event Candidate 2XMMi J184725.1-631724