Further to IAUC 8203 Mario Hamuy and Miguel Roth, Carnegie Observatories,
report that a spectrum (range 380-930 nm) of SN 2003id (cf. IAUC 8201),
obtained on Oct. 16.27 with the Las Campanas Dupont 2.5-m telescope
+ WFCCD) reveals unusual features. While the spectrum is characterized
by strong absorptions between 466-536 nm (presumably due to Fe II blends)
seen in other Type Ic events, a strong unidentified absorption centered
at 562 nm distinguishes it from other Type Ic or Type Ib supernovae.
This feature is blended with another strong absorption centered at 579 nm.
The spectrum shows a strong Ca II triplet line exhibiting a broad P-Cyg
profile with the minimum at 826 nm. Adopting the NED host-galaxy
recession velocity of 2288 km/s, the minimum of the Ca II triplet
implies an expansion velocity of -13000  km/s which is very high
for a supernova that is at least one month old. The optical lightcurves
are also unusual: the V-band flux decreased by ~0.25 mag between
Sept. 19 and 25; a plateau phase (V=17.25) ensued through Oct. 3; the flux
has been dropping afterwards reaching V=18.6 on Oct 16. Further
observations at optical and other wavelengths would be useful.