[IAUC] CBET 1540: 20081018 : SUPERNOVAE 2008gc, 2008ge, 2009gg, 2008gi

[IAUC mailing list]

                                                  Electronic Telegram No. 1540
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVAE 2008gc, 2008ge, 2009gg, 2008gi
     M. Stritzinger, G. Folatelli, G. Pignata, F. Forster, and M. Hamuy, on
behalf of the Millennium Center for Supernova Studies and the Carnegie
Supernova Project, report that they obtained spectra (range 350-930 nm) of
2008gc (cf. CBET 1529), 2008ge (cf. CBET 1531), 2008gg (cf. CBET 1538), and
2008gi (cf. CBET 1539) with the European Southern Observatory New Technology
Telescope (+ EFOSC) on Oct. 14.1-15.1 UT.  The spectrum of 2008gc shows it
to be a type-Ib/c supernova.  With the aid of the "Supernova Identification"
code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024), 2008gc is found to be
most similar to the type-Ib supernovae 1999ex and 2005bf near maximum light.
According to SNID, the redshift of 2008gc is roughly 16500 km/s.
     SN 2008ge resembles a peculiar type-Ia supernova several weeks past
maximum; SNID suggests that supernova 2008ge is a 2002cx-like event at 23
days past maximum.  The spectrum of 2008gg appears to be that of a normal
type-Ia supernova.  SNID reveals that 2008gg closely resembles 2002bo at a
few days past maximum; adopting a host-galaxy recession velocity of 9598
km/s (Wong et al. 2006, MNRAS 371, 4) for the host galaxy (NGC 539), Si II
(rest 635.5 nm) is measured to be blue-shifted by roughly 11000 km/s.  SN
2008gi is a young type-II supernova.  SNID reveals that 2008gi resembles
SN 2006bp around two weeks past explosion; adopting a host-galaxy recession
velocity of 7328 km/s for the host galaxy, H-beta is measured to be
blue-shifted by roughly 7500 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2008 CBAT
2008 October 18                  (CBET 1540)              Daniel W. E. Green