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We report near-infrared and optical follow-up observations of the afterglowof the Gamma-Ray Burst 000418 starting 2.5 days after the occurrence of theburst and extending over nearly seven weeks. GRB 000418 represents the secondcase for which the afterglow was initially identified by observations in thenear-infrared. During the first 10 days its R-band afterglow was wellcharacterized by a single power-law decay with a slope of 0.86. However, atlater times the temporal evolution of the afterglow flattens with respect to asimple power-law decay. Attributing this to an underlying host galaxy we findits magnitude to be R=23.9 and an intrinsic afterglow decay slope of 1.22. Theafterglow was very red with R-K=4 mag. The observations can be explained by anadiabatic, spherical fireball solution and a heavy reddening due to dustextinction in the host galaxy. This supports the picture that (long) bursts areassociated with events in star-forming regions.Comment: Accepted for publication in The Astrophysical Journal. 12 pages;  citations & references updated; minor textual change

The Very Red Afterglow of GRB 000418: Further Evidence for Dust Extinction in a Gamma‐Ray Burst Host Galaxy