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We model the light curves of the novel and extremely luminous transientASASSN-15lh at nine different frequencies, from infrared to ultra-violet photonenergies, as an evolving relativistic disc produced in the aftermath of a tidaldisruption event. Good fits to all nine light curves are simultaneouslyobtained when $M_{\rm acc} \simeq 0.07 M_{\odot}$ is accreted onto a black holeof mass $M \simeq 10^9 M_{\odot}$, and near maximal rotation $a/r_g = 0.99$.The best fit black hole mass is consistent with a number of existing estimatesfrom galactic scaling relationships. If confirmed, our results represent thedetection of one of the most massive rapidly spinning black holes to date, andare strong evidence for a TDE origin for ASASSN-15lh. This would be the firstTDE to be observed in the disc dominated state at optical and infraredfrequencies.

ASASSN-15lh: a TDE about a maximally rotating $10^9 M_{\odot}$ black hole