Electronic Telegram No. 874
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://cfa-www.harvard.edu/iau/cbat.html


SUPERNOVA 2007ag IN UGC 5392
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 350-740 nm) of 2007ag
(cf. CBET 868), obtained on Mar. 10.34 UT by R. Hutchins with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-Ib
supernova around maximum light.  The spectrum shows conspicuous lines of He
I (rest 447.1 and 587.6 nm) and is most similar to that of the type-Ib
supernova 2005hg (cf. CBET 271) at one day before maximum light.  The
spectrum appears to be slightly reddened, although interstellar Na I
absorption at the redshift of the host galaxy cannot be reliably detected
due to the moderate signal-to-noise ratio.  A comparison plot can be seen at
the following URL:
http://www.cfa.harvard.edu/oir/Research/supernova/spectra/sn2007ag_comp.gif


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 March 10                    (CBET 874)               Daniel W. E. Green