Letter to the Editor
The XMM-Newton observation of GRB 040106: Evidence for an afterglow in a wind environment
Istituto di Astrofisica Spaziale e Fisica Cosmica/CNR, via fosso del cavaliere, 100, 00133, Roma, Italy e-mail: [gendre; piro; depasq]@rm.iasf.cnr.it
Accepted: 28 July 2004
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.
Key words: gamma-ray burst / X-ray: general
© ESO, 2004