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We present the XMM-Newton observation of GRB 040106. From the X-ray spectralindex and temporal decay, we argue that the afterglow is consistent with afireball expanding in a wind environment. A constant density environment isexcluded by the data. This is one of the very few cases in which thisconclusion can be drawn.Comment: Letter accepted for publication in Astronomy and Astrophysics. 4  pages, 3 B&W figure

The XMM-Newton observation of GRB 040106: Evidence for an afterglow in a wind environment