  We present the earliest BTA (SAO RAS 6-m telescope) spectroscopic
observations of the GRB030329 optical transient (OT), which almost coincide in
time with the first "break" (t ~ 0.5 day after the GRB) of the OT light curve.
The BTA/MPFS (Multi Pupil Fiber Spectrograph) spectra are clearly not smooth:
the OT spectra showed a continuum with several broad spectral features at about
4000, 4450, 5900AA. The OT spectrum showed some evolution starting from the
first night after the burst, and the beginning of spectral changes are seen as
early as ~10-12 hours after the GRB. The onset of the spectral changes for t <
1 day indicates that the contribution from Type Ic supernova (SN) into the OT
optical flux can be detected earlier. So, summarizing our and other
spectroscopic data on the OT we confirm the evolution of the OT spectrum and
color pointed also by other authors (Hjorth et al. 2003; Matheson et al.
2003b). The early spectra of GRB030329/SN2003dh properties can be consistent
with a shock moving into a stellar wind formed from the pre-SN. Such a behavior
(similar to one near the UV shock breakout in SNe) can be explained by the
existence of a dense matter in the immediate surroundings of GRB/SN progenitor.
