Electronic Telegram No. 2122
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVAE 2010C AND 2010D
     J. Prieto, Carnegie Observatories; and R. Khan, Ohio State University,
report that optical spectra (range 390-740 nm; resolution 1.4 nm) of 2010C
and 2010D (cf. CBET 2119) were obtained with the Hiltner 2.4-m telescope at
MDM Observatory on Jan. 12.4 UT.  The spectrum of 2010C shows a blue
continuum with narrow (FWHM about 900 km/s) hydrogen Balmer lines in emission,
as well as several Fe II lines and the N II 654.8-nm line in emission; the
spectrum resembles spectra of luminous-blue-variable outbursts, so-called
``supernova impostors" (e.g., SN 1997bs; van Dyk et al. 2000, PASP 112, 1532).
The spectrum of 2010D shows a blue continuum with broad Balmer lines
characteristic of a young type-II supernova.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 January 13                  (CBET 2122)              Daniel W. E. Green