[IAUC] CBET 2086: 20091220 : SUPERNOVA 2009mk IN PGC 474

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                                                  Electronic Telegram No. 2086
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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SUPERNOVA 2009mk IN PGC 474
     R. Chornock and E. Berger, Harvard-Smithsonian Center for Astrophysics,
report that a spectrum (range 470-890 nm) of 2009mk (cf. CBET 2080), taken on
Dec. 19.16 UT with GMOS on the Gemini-South telescope, reveals that the object
is a type-IIb supernova.  Cross-correlation with a library of supernova
spectra using the "SuperNova IDentification" code (SNID; Blondin and Tonry
2007, Ap.J. 666, 1024) indicates that 2009mk is most similar to SN 1996cb near
maximum light.  Strong H-alpha absorption is present, with the absorption
minimum blueshifted by 13500 km/s, as well as additional absorptions from He I.


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                         (C) Copyright 2009 CBAT
2009 December 20                 (CBET 2086)              Daniel W. E. Green