Early observations of the flaring object ASASSN-15lh led astronomers to cast it as the most luminous supernova ever. Now, convincing evidence indicates that this object is not as it seemed. In fact, fitting it into any known box is a challenge.
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Cenko, S. Astrophysics: The true nature of transients. Nat Astron 1, 0008 (2017). https://doi.org/10.1038/s41550-016-0008
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DOI: https://doi.org/10.1038/s41550-016-0008
