Electronic Telegram No. 969
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


SUPERNOVA 2007cj IN IC 2531
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 360-940 nm) of the
possible supernova reported on CBET 968, obtained on May 21.05 UT by M. A.
P. Torres and J. Steiner with the Magellan Clay 6.5-m telescope (+ LDSS3),
shows it to be a reddened type-Ia supernova around one month past maximum
light.  Cross-correlation with a library of supernova spectra indicates that
SN 2007cj is most similar to the type-Ia supernova 2002bo at 29 days past
maximum light.  Also, interstellar Na I D absorption at the redshift of the
host galaxy is visible in the spectrum with an equivalent width of 0.2 nm.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 May 22                      (CBET 969)               Daniel W. E. Green