The XMM-Newton observation of GRB 040106 : evidence for an afterglow in   a wind environment
  We present the XMM-Newton observation of GRB 040106. From the X-ray spectral index and temporal decay, we argue that the afterglow is consistent with a fireball expanding in a wind environment. A constant density environment is excluded by the data. This is one of the very few cases in which this conclusion can be drawn. 
B. Gendre, L. Piro, M. De Pasquale (IASF/CNR-Rome)