[IAUC] CBET 632: 20060919 : SUPERNOVA 2006gc IN UGC 3219

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                                                  Electronic Telegram No. 632
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2006gc IN UGC 3219
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 350-740 nm) of SN
2006gc (cf. CBET 628, IAUC 8750), obtained by P. Berlind on Sept. 19.50 UT
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be
a type-II supernova roughly one month past explosion.  The spectrum consists
of P-Cyg lines of the Balmer series, consistent with the plateau phase of a
normal type-II supernova.  Adopting a recession velocity of 8481 km/s for
the host galaxy (from de Vaucouleurs et al. 1991, Third Ref. Cat. of Bright
Galaxies), the maximum absorption in the H_beta line (rest 486.1 nm) is
blueshifted by roughly 9500 km/s.
     J. M. Silverman, T. N. Steele, and A. V. Filippenko, University of
California, Berkeley, report that inspection of CCD spectra (range 325-1030
nm), obtained on Sept. 19 UT with the Lick 3-m telescope (+ Kast), shows
that SN 2006gc is of type II, probably several weeks after the explosion.
Removing the host-galaxy recession velocity of 8481 km/s (de Vaucouleurs et
al. 1991, Third Reference Catalogue of Bright Galaxies), the minimum of the
H-alpha P-Cyg profile is measured to be -11500 km/s.


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                         (C) Copyright 2006 CBAT
2006 September 19                (CBET 632)               Daniel W. E. Green