Electronic Telegram No. 2137
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)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVAE 2010E AND 2010F
      R. J. Foley, Harvard-Smithsonian Center for Astrophysics, reports that
inspection of CCD spectra (range 305-1030 nm), obtained on Jan. 20 UT with
the Magellan Clay 6.5-m telescope (+ MagE), shows that 2010E (cf. CBET 2121)
and 2010F (cf. CBET 2125) are both type-II 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 2010E
and 2010F are most similar to SN 2004et at 23 days after maximum brightness
and SN 1999em at maximum brightness, respectively.  Removing the host-galaxy
recession velocity of 6180 km/s (found from narrow lines), the minimum of the
H_alpha absorption feature is blueshifted by 6000 and 11400 km/s for 2010E
and 2010F, respectively.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 January 20                  (CBET 2137)              Daniel W. E. Green