Optical and NIR observations of the afterglow of GRB 020813

  title={Optical and NIR observations of the afterglow of GRB 020813},
  author={Stefano Covino and Daniele B. Malesani and Fabrizio Tavecchio and Lucio Angelo Antonelli and A Arkharov and Andrea Di Paola and Dino Fugazza and Gabriele Ghisellini and V M Larionov and Davide Lazzati and Filippo Mannucci and Nicola Masetti and R. Barrena and Stefano Benetti and Alberto J. Castro-Tirado and Sperello di Serego Alighieri and Fabrizio Fiore and Filippo Frontera and A. S. Fruchter and Francesca Ghinassi and Michael D. Gladders and Patrick B. Hall and Gian Luca Israel and S. Klose and Antonio Magazz{\'u} and Eliana Palazzi and Marco Pedani and E. Pian and Patrizia Romano and Mauro Stefanon and Luigi Stella},
  journal={Astronomy and Astrophysics},
We present optical and near-infrared (NIR) photometry of the bright afterglow of GRB 020813. Our data span from 3 hours to 4 days after the GRB event. A rather sharp achromatic break is present in the light curve, 14 hours after the trigger. In the framework of jetted fireballs, this break corresponds to a jet half-opening angle of $1.9\degr\pm0.2\degr$, the smallest value ever inferred for a GRB. We discuss our results in the framework of currently available models, and find that they have… 

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