[IAUC] CBET 475: 20060412 : SUPERNOVA 2006bk IN MCG +6-33-20

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                                                  Electronic Telegram No. 475
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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SUPERNOVA 2006bk IN MCG +6-33-20
     K. Kinugasa, Gunma Astronomical Observatory (GAO); and H.
Yamaoka, Kyushu University, write that a low-resolution spectrum
(range 420-800 nm, resolution about 500) of SN 2006bk (CBET 462,
IAUC 8698) was obtained under poor conditions on Apr. 5.6 UT with
the GAO 1.5-m telescope.  The spectrum shows a smooth continuum
with a broad absorption feature around 520 nm (width about 50 nm)
and 680 nm (width about 30 nm).  If the recession velocity of the
host galaxy (14850 km/s, Huchra et al. 1995, Ap.J. Suppl. 99, 391)
is due to the Hubble expansion, the absolute magnitude at discovery
is about -19.6 (assuming H_0 = 73 km/s/Mpc), which is somewhat
luminous for a typical gravitational-collapsed event.  Another
spectrogram obtained on Apr. 9.6 shows a blue continuum with a
prominent Fe II absorption feature around 520 nm (observed
wavelength; width about 40 nm, 'W'-shaped).  No other remarkable
feature exists, which suggests that it is a type-Ic supernova near
maximum light.  Compared with the previous spectrum, no remarkable
spectral evolution is detected.


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                         (C) Copyright 2006 CBAT
2006 April 12                    (CBET 475)               Daniel W. E. Green