[IAUC] CBET 1806: 20090520 : SUPERNOVA 2009em IN NGC 157

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                                                  Electronic Telegram No. 1806
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2009em IN NGC 157
     H. Navasardyan and S. Benetti, Istituto Nazionale di Astrofisica,
Osservatorio Astronomico di Padova, report that a spectrogram (range 360-740
nm, resolution 1.4 nm) of 2009em (cf. CBET 1798), obtained on May 19.37 UT
with the European Southern Observatory New Technology Telescope (+ EFOSC2),
shows it to be an evolved type-Ic supernova, about 2 months after the
explosion.  Assuming a recession velocity of 1652 km/s (from H I Parkes
All Sky Survey Final Catalogue, 2006; via NED) for the host galaxy, the
"GELATO" spectrum-comparison code (Harutyunyan et al. 2008, A.Ap. 488, 383;
available at https://gelato.tng.iac.es) provides good fits to a spectrum of
the type-Ic supernova 2007gr (Valenti et al. 2008, Ap.J. 673, L155) taken
52 days after the B-band maximum light.  The red continuum may imply
non-negligible extinction for SN 2009em.


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                         (C) Copyright 2009 CBAT
2009 May 20                      (CBET 1806)              Daniel W. E. Green