Electronic Telegram No. 1777
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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SUPERNOVA 2009dm IN MCG +07-24-16
     D. Milisavljevic and R. Fesen, Dartmouth College, report that a
low-dispersion spectrum (range 420-790 nm) taken of 2009dm (cf. CBET 1773),
taken on Apr. 21.2 UT with the 2.4-m Hiltner telescope (+ CCDS) at MDM
Observatory, shows it to be a type-II supernova near maximum light.
Comparison with a library of supernova spectra using the "Supernova
Identification" tool (SNID; Blondin and Tonry 2007, Ap.J., 666, 1024)
provides good matches with type-IIP events such as SN 2004et and SN 2005cs
within a few days of maximum.  A narrow H_alpha emission component
corresponds with a SNID calculated redshifted of 0.024.  The expansion
velocity deduced from the H_alpha absorption is about 9200 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 April 22                    (CBET 1777)              Daniel W. E. Green