@article{1709,
  author = {L. Antonelli and V. Testa and P. Romano and D. Guetta and K. Torii and V. Elia and D. Malesani and G. Chincarini and S. Covino and P. D'Avanzo and Della Valle and Fabrizio Fiore and D. Fugazza and A. Moretti and L. Stella and G. Tagliaferri and S. Barthelmy and David Burrows and S. Campana and M. Capalbi and G. Cusumano and N. Gehrels and P. Giommi and D. Lazzati and V. La Parola and V. Mangano and T. Mineo and J. Nousek and P. O'Brien and M. Perri},
  title = {The multiwavelength afterglow of GRB~050721: a puzzling rebrightening seen in the optical but  not in the X-ray},
  year = {2006},
  journal = {Astronomy and Astrophysics},
  volume = {456},
  pages = {509-515},
  month = {Jan-09-2006},
  issn = {0004-6361},
  url = {http://www.aanda.org/10.1051/0004-6361:20065283},
  doi = {10.1051/0004-6361:20065283},
}