Barbary et al (2008, http://uk.arxiv.org/abs/0809.1648) have discovered an (apparently) new class of optical transient objects. The spectrum is a mystery, the source brightened by >5-6 magnitudes over 100 days and no host galaxy can be seen. Might be Galactic, might be extra-galactic. If the latter, the most reasonable estimate of redshift gives a peak luminosity of -22.1 - close to the brightest SNe seen.
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