Electronic Telegram No. 454
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2006bb IN UGC 4468
     K. Kinugasa, Gunma Astronomical Observatory (GAO); and H. Yamaoka,
Kyushu University, write that a low-resolution spectrogram (range
450-750 nm) of SN 2006bb (cf. IAUC 8693) was obtained with the GAO
1.5-m telescope on Mar. 31.6 UT.  The spectrum shows deep and broad
absorption lines at (observed wavelengths) 622, 575, and around 500 nm
(`W'-shaped), which suggests that 2006bb is a type-Ic supernova around
maximum light.  Adopting a recession velocity of 7563 km/s for UGC
4468 (from Falco et al. 1999, PASP 111, 438), the expansion velocity,
assuming that the 622-nm feature corresponds to the Si II 635.5-nm line,
is 14000 km/s.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 April 1                     (CBET 454)               Daniel W. E. Green