  Observations of the optical afterglow of GRB 041006 with the Kiso Observatory
1.05 m Schmidt telescope, the Lulin Observatory 1.0 m telescope and the
Xinglong Observatory 0.6 m telescope. Three-bands (B, V and R) of photometric
data points were obtained on 2004 October 6, 0.025-0.329 days after the burst.
These very early multi band light curves imply the existence of a color
dependent plateau phase. The B-band light curve shows a clear plateau at around
0.03 days after the burst. The R band light curve shows the hint of a plateau,
or a possible slope change, at around 0.1 days after the burst. The overall
behavior of these multi-band light curves may be interpreted in terms of the
sum of two separate components, one showing a monotonic decay the other
exhibiting a rising and a falling phase, as described by the standard afterglow
model.
