Electronic Telegram No. 2325
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat@iau.org; cbatiau@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2010ed IN UGC 10728
     P. Challis, R. J. Foley, R. Kirshner, E. Berger, A. Soderberg and G. H.
Marion, Harvard-Smithsonian Center for Astrophysics, report that a CCD
spectrum (range 345-865 nm), obtained on June 16 UT with the 6.5-m MMT
telescope (+ Blue Channel), shows that 2010ed (cf. CBET 2324) is a type-Ia
supernova.  The continuum is relatively red, and there is a prominent
(EW = 0.52 nm) Na D absorption component at the redshift of the host galaxy
of cz = 14700 km/s.  Cross-correlation with a library of supernova spectra,
using the "SuperNova IDentification" code (SNID; Blondin and Tonry 2007,
Ap.J. 666, 1024), indicates that 2010ed may be similar to the luminous
supernova 1999aa (e.g., Garavini et al. 2004, A.J. 128, 387) near maximum
light.  The Si II absorption is blueshifted by 10500 km/s.  Given an
apparent magnitude of about 18.7 (from CBET 2324), the distance modulus of
36.55 suggests that M = -17.85, which is quite dim for a luminous type-Ia
supernova.  Together with the strong D-line, this suggests a significant
amount of extinction for SN 2010ed.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 June 16                     (CBET 2325)              Daniel W. E. Green