Type:		Journal, Article
Title:		A very luminous magnetar-powered supernova associated with an ultra-long γ-ray burst
Author(s):		Greiner, J.; Mazzali, P. A.; Kann, D. A.; Krühler, T.; Pian, E.; Prentice, S.; Olivares, F.; Rossi, A.; Klose, S.; Taubenberger, S.; Knust, F.; Afonso, P. M.; Ashall, C.; Bolmer, J.; Delvaux, C.; Diehl, R.; Elliott, J.; Filgas, R.; Fynbo, J. P.; Graham, J. F.; Guelbenzu, A. N.; Kobayashi, S.; Leloudas, G.; Savaglio, S.; Schady, P.; Schmidl, S.; Schweyer, T.; Sudilovsky, V.; Tanga, M.; Updike, A. C.; van Eerten, H.; Varela, K.
Date:		2015/07/09
Abstract:		A new class of ultra-long-duration (more than 10,000 seconds) γ-ray bursts has recently been suggested1, 2, 3. They may originate in the explosion of stars with much larger radii than those producing normal long-duration γ-ray bursts3, 4 or in the tidal disruption of a star3. No clear supernova has yet been associated with an ultra-long-duration γ-ray burst. Here we report that a supernova (SN 2011kl) was associated with the ultra-long-duration γ-ray burst GRB 111209A, at a redshift z of 0.677. This supernova is more than three times more luminous than type Ic supernovae associated with long-duration γ-ray bursts5, 6, 7, and its spectrum is distinctly different. The slope of the continuum resembles those of super-luminous supernovae8, 9, but extends further down into the rest-frame ultraviolet implying a low metal content. The light curve evolves much more rapidly than those of super-luminous supernovae. This combination of high luminosity and low 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 strongly magnetized neutron star (a magnetar), which has also been proposed as the explanation for super-luminous supernovae10.
Journal (full):		Nature
Volume:		523
Start Page:		189
End Page:		192
Link:		http://www.nature.com/nature/journal/v523/n7559/full/nature14579.html?WT.ec_id=NATURE-20150709&spMailingID=49054266&spUserID=NTgyNDc4MjE3NwS2&spJobID=720986702&spReportId=NzIwOTg2NzAyS0