Electronic Telegram No. 808
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 2007I
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 350-740 nm) of 2007I
(cf. CBET 807), obtained on Jan. 16.55 UT by M. Calkins with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a "broad-line"
type-Ic supernova around 2 weeks past maximum light.  Cross-correlation with
a library of supernova spectra indicates that 2007I is most similar to SN
1997ef (Iwamoto et al. 2000, Ap.J. 534, 660) at 2 weeks past maximum.  A
comparison plot can be seen at the following URL:
http://cfa-www.harvard.edu/oir/Research/supernova/spectra/sn2007I_comp.gif.
We detect narrow emission lines in the spectrum at the redshift of the
apparent host galaxy SDSS J115913.13-013616.0 (cz = 6487 km/s; Sloan
Digital Sky Survey Data Release 2).  Assuming that the galaxy is in the
Hubble flow and the supernova suffers negligible extinction, the discovery
magnitude of 17.6 corresponds to an absolute magnitude of roughly -17,
similar to SN 1997ef at the same phase.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 January 16                  (CBET 808)               Daniel W. E. Green