Electronic Telegram No. 2112
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 2009nr AND 2010A
     R. J. Foley, Harvard-Smithsonian Center for Astrophysics, on behalf of
the CfA Supernova Program, reports that inspection of CCD spectra (range
350-740 nm), obtained by G. Esquerdo on Jan. 7 UT with the Whipple
Observatory 1.5-m telescope (+ FAST), shows that 2009nr (cf. CBET 2111) and
2010A (cf. CBET 2109) are both type-Ia supernovae.  Cross-correlation with a
library of supernova spectra using the "SuperNova IDentification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that both may be similar
to the luminous supernovae 1991T and 1999aa (e.g., Filippenko et al. 1992,
Ap.J. 384, L15; Garavini et al. 2004, A.J. 128, 387).  SN 2009nr is most
similar to SN 1991T at 12 days past maximum brightness.  SN 2010A is similar
to SN 1999aa at one day before maximum brightness, but is also similar to
the "normal" type-Ia supernova 1999ee at 9 days before maximum brightness.
Removing the host-galaxy recession velocity of 6180 km/s (found from narrow
emission lines), the minimum of the Si II 635.5-nm absorption feature is
blueshifted by 12700 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 January 7                   (CBET 2112)              Daniel W. E. Green