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A new class of ultra-long duration (>10,000 s) gamma-ray bursts has recentlybeen suggested. They may originate in the explosion of stars with much largerradii than normal long gamma-ray bursts or in the tidal disruptions of a star.No clear supernova had yet been associated with an ultra-long gamma-ray burst.Here we report that a supernova (2011kl) was associated with the ultra-longduration burst 111209A, at z=0.677. This supernova is more than 3 times moreluminous than type Ic supernovae associated with long gamma-ray bursts, and itsspectrum is distinctly different. The continuum slope resembles those ofsuper-luminous supernovae, but extends farther down into the rest-frameultra-violet implying a low metal content. The light curve evolves much morerapidly than super-luminous supernovae. The combination of high luminosity andlow metal-line opacity cannot be reconciled with typical type Ic supernovae,but can be reproduced by a model where extra energy is injected by a stronglymagnetized neutron star (a magnetar), which has also been proposed as theexplanation for super-luminous supernovae.

A very luminous magnetar-powered supernova associated with an ultra-long gamma-ray burst