Photometry and spectroscopy of the GRB 970508 optical counterpart

A.J. Castro-Tirado, J. Gorosabel, N. Benitez, Christian Wolf, R. Fockenbrock, E. Martinez-Gonzalez, H. Kristen, A. Broeils, H. Pedersen, J. Greiner, E. Costa, M. Feroci, L. Piro, F. Frontera, L. Nicastro, E. Palazzi, C. Bartolini, A. Guarnieri, N. Masetti, A. PiccioniM. Mignoli, M. Wold, M. Lacy, K. Birkle, T. Broadhurst, Søren Brandt, Niels Lund

Research output: Contribution to journalJournal articleResearchpeer-review


An optical transient within the error box of the gamma ray burst GRB 970508 was imaged 4 hours after the event. It displayed a strong ultraviolet excess, and reached maximum brightness 2 days later. The optical spectra did not show any emission lines, and no variations on time scales of minutes were observed for 1 hour during the decline phase. According to the fireball and afterglow models, the intensity should rise monotonically before the observed optical maximum, but the data indicate that another physical mechanism may be responsible for the constant phase seen during the first hours after the burst.
Original languageEnglish
Issue number5353
Pages (from-to)1011-1014
Publication statusPublished - 1998
Externally publishedYes


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