A very energetic supernova associated with the γ-ray burst of 29 March 2003

@article{Hjorth2003AVE,
  title={A very energetic supernova associated with the $\gamma$-ray burst of 29 March 2003},
  author={Jens Hjorth and Jesper Sollerman and Palle M{\o}ller and J. P. U. Fynbo and S. E. Woosley and Chryssa Kouveliotou and Nial R. Tanvir and J. Greiner and Michael I. Andersen and Alberto J. Castro-Tirado and Jose Maria Castro Ceron and A. S. Fruchter and Javier Gorosabel and P. Jakobsson and Lex Kaper and S. Klose and Nicola Masetti and Holger Pedersen and Kristian Pedersen and E. Pian and Eliana Palazzi and James E. Rhoads and Evert Rol and Edward van den Heuvel and Paul M. Vreeswijk and Darach Watson and Ralph Wijers},
  journal={Nature},
  year={2003},
  volume={423},
  pages={847-850}
}
Over the past five years evidence has mounted that long-duration (>2 s) γ-ray bursts (GRBs)—the most luminous of all astronomical explosions—signal the collapse of massive stars in our Universe. This evidence was originally based on the probable association of one unusual GRB with a supernova, but now includes the association of GRBs with regions of massive star formation in distant galaxies, the appearance of supernova-like ‘bumps’ in the optical afterglow light curves of several bursts and… 
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Radio observations of GRB030329 indicate a common origin for cosmic explosions in which the energy in the highest-velocity ejecta is extremely variable, and the contribution of the γ-rays is energetically minor.
A very luminous magnetar-powered supernova associated with an ultra-long γ-ray burst
TLDR
It is reported that a supernova was associated with the ultra-long-duration γ-ray burst GRB 111209A, at a redshift z of 0.677, and this supernova is more than three times more luminous than type Ic supernovae associated with long-duration μ-ray bursts, and its spectrum is distinctly different.
FLARE-LESS LONG GAMMA-RAY BURSTS AND THE PROPERTIES OF THEIR MASSIVE PROGENITOR STARS
While there is mounting evidence that long gamma-ray bursts (GRBs) are associated with the collapse of massive stars, the detailed structure of their pre-supernova stage is still debatable.
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