Evidence for supernova signatures in the spectrum of the late-time bump of the optical afterglow of GRB 021211

  title={Evidence for supernova signatures in the spectrum of the late-time bump of the optical afterglow of GRB 021211},
  author={Massimo Della Valle and Daniele B. Malesani and Stefano Benetti and Vincenzo Testa and M. Hamuy and Lucio Angelo Antonelli and Guido L. Chincarini and Gabriele Cocozza and Stefano Covino and Paolo D’Avanzo and Dino Fugazza and Gabriele Ghisellini and Roberto Gilmozzi and Davide Lazzati and E. I. Mason and P. A. Mazzali and Luigi Stella},
  journal={Astronomy and Astrophysics},
We present photometric and spectroscopic observations of the gamma-ray burst GRB 021211 obtained during the late stages of its afterglow. The light curve shows a rebrightening occurring ∼25 days after the GRB. The analysis of a VLT spectrum obtained during the bump (27 days after the GRB) reveals a suggestive resemblance with the spectrum of the prototypical type-Ic SN 1994I, obtained ∼10 days past maximum light. Particularly we have measured a strong, broad absorption feature at 3770 A, which… 
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