The very red afterglow of GRB 000418: Further evidence for dust extinction in a gamma-ray burst host galaxy

S. Klose, B. Stecklum, N. Masetti, E. Pian, E. Palazzi, A.A. Henden, F.J. Vrba, D.H. Hartmann, O. Fischer, J. Gorosabel, C. Sanchéz-Fernandéz, D. Butler, Th. Ott, S. Hippler, M. Kasper, R. Weiss, A.J. Castro-Tirado, J. Greiner, C. Bartolini, A. GuarnieriA. Piccioni, S. Benetti, F. Ghinassi, A. Magazzú, K. Hurley, T. Cline, J. Trombka, T. McClanahan, R. Starr, J. Goldsten, R. Gold, E. Mazets, S. Golenetskii, K. Noeske, P. Papaderos, P.M. Vreeswijk, N. Tanvir, A. Oscoz, J.A. Muñoz, J.M. Sastro Cerón

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    We report near-infrared and optical follow-up observations of the afterglow of the GRB 000418 starting 2.5 days after the occurrence of the burst and extending over nearly 7 weeks. GRB 000418 represents the second case for which the afterglow was initially identified by observations in the near-infrared. During the first 10 days its R-band afterglow was well characterized by a single power-law decay with a slope of 0.86. However, at later times the temporal evolution of the afterglow flattens with respect to a simple power-law decay. Attributing this to an underlying host galaxy, we find its magnitude to be R = 23.9 and an intrinsic afterglow decay slope of 1.22. The afterglow was very red with R-K approximate to 4 mag. The observations can be explained by an adiabatic, spherical fireball solution and a heavy reddening due to dust extinction in the host galaxy. This supports the picture that (long) bursts are associated with events in star-forming regions.
    Original languageEnglish
    JournalAstrophysical Journal
    Issue number1
    Pages (from-to)271-276
    Publication statusPublished - 2000


    • gamma rays : bursts


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