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    • No supernovae associated with two long-duration gamma-ray bursts 

      Fynbo, Johan P. U.; Watson, Darach; Thöne, Christina C.; Sollerman, Jesper; Bloom, Joshua S.; Davis, Tamara M.; Hjorth, Jens; Jakobsson, Páll; Jørgensen, Uffe G.; Graham, John F.; Fruchter, Andrew S.; Bersier, David; Kewley, Lisa; Cassan, Arnaud; Castro Cerón, José María; Foley, Suzanne; Gorosabel, Javier; Hinse, Tobias C.; Horne, Keith D.; Jensen, Brian L.; Klose, Sylvio; Kocevski, Daniel; Marquette, Jean-Baptiste; Perley, Daniel; Ramírez Ruiz, Enrico; Stritzinger, Maximilian D.; Vreeswijk, Paul M.; Wijers, Ralph A. M.; Woller, Kristian G.; Xu, Dong; Zub, Marta (NATURE PUBLISHING GROUP, 2006-12-21)
      It is now accepted that long-duration gamma-ray bursts (GRBs) are produced during the collapse of a massive star(1,2). The standard 'collapsar' model(3) predicts that a broad-lined and luminous type Ic core-collapse supernova ...