Super-solar metallicity at the position of the ultra-long GRB 130925A

  title={Super-solar metallicity at the position of the ultra-long GRB 130925A},
  author={Patricia Schady and Thomas Kruehler and Jochen Greiner and John F. Graham and David Alexander Kann and J. Bolmer and Corentin Delvaux and Jonny Elliott and S. Klose and Fabian Knust and A. Nicuesa Guelbenzu and Arne Rau and Andrea Rossi and Sandra Savaglio and Sebastian Schmidl and T. Schweyer. V. Sudilovsky and M. Tanga and Nial R. Tanvir and Karla Varela and Philip Wiseman},
  journal={Astronomy and Astrophysics},
Over the last decade there has been immense progress in the follow-up of short and long gamma-ray bursts (GRBs), resulting in a significant rise in the detection rate of X-ray and optical afterglows, in the determination of GRB redshifts, and of the identification of the underlying host galaxies. Nevertheless, our theoretical understanding of the progenitors and central engines powering these vast explosions is lagging behind, and a newly identified class of ultra-long GRBs has fuelled… 

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