Electronic Telegram No. 260
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


SUPERNOVAE 2005gn, 2005gz, 2005ha and 2005hc
     M. Hamuy and J. Maza, University of Chile; and G. Folatelli, Las Campanas
Observatory, on behalf of the Carnegie Supernova Project, report spectroscopic
observations (range 400-1000 nm) of SNe 2005gn, 2005gz and 2005ha (cf. IAUC
8616) and SN 2005hc (cf. CBET 259), obtained on Oct. 18.27, 18.14, 18.31 and
18.20 UT, respectively, with the European Southern Observatory 3.5-m New
Technology Telescope (+ EMMI spectrograph) at La Silla.
     SN 2005gn is of type IIn, with prominent H-alpha, H-beta, and Ca II
near-infrared triplet emission, weaker He I 587.6-nm and 706.5-nm emission
and a blue continnum.  The H-alpha line has a narrow component (FHWM 0.5 nm)
and three broader components of different widths, the broadest one showing an
asymmetric profile with an extended red wing.
     The spectrum of SN 2005gz is too noisy to derive a definitive
classification.  A hint of broad H-alpha emission suggests that this is a
type II supernova.
     A noisy spectrum of SN 2005ha shows a hint of Ca II near-infrared triplet
emission.  Since this feature is present in most supernova types it is not
possible to provide a spectral type.
     SN 2005hc is of type Ia some 5 days before maximum light.  Assuming the
Sloan Digital Sky Survey recession velocity of 13770 km/s for the host
galaxy, an expansion velocity of 9600 km/s is derived from the absorption
minimum of the Si II 635.5-nm doublet.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2005 CBAT
2005 October 20                  (CBET 260)               Brian G. Marsden