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Groot, P. J; Galama, T. J; Vreeswijk, P. M; Wijers, R. A. M. J; Pian, E; Palazzi, E; van Paradijs, J; Kouveliotou, C; Zand, J. J. M. in 't; Heise, J; Robinson, C; Tanvir, N; Lidman, C; Tinney, C; Keane, M; Briggs, M; Hurley, K; Gonzalez, J.-F; Hall, P; Smith, M. G; Covarrubias, R; Jonker, P. G; Casares, J; Masetti, N; Frontera, F; Feroci, M; Piro, L; Costa, E; Smith, R; Jones, B; Windridge, D; Bland-Hawthorn, J; Veilleux, S; Garcia, M; Brown, W. R; Stanek, K. Z; Castro-Tirado, A. J; Gorosabel, J; Greiner, J; Jäger, K; Böhm, A; Fricke, K. J
The Astrophysical journal, 08/1998, Letnik: 502, Številka: 2Journal Article
We report the discovery of the optical counterpart to GRB 980326. Its rapid optical decay can be characterized by a power law with exponent Ϫ and a constant underlying source at. Its optical 2.10 ע 0.13 R ϭ 25.5 ע 0.5 c colors 2.1 days after the burst imply a spectral slope of Ϫ. The gray spectrum as observed with 0.66 ע 0.70 BATSE shows that it is among the 4% softest bursts ever recorded. We argue that the rapid optical decay may be a reason for the nondetection of some low-energy afterglows of GRBs.
