[IAUC] CBET 2378: 20100719 : SUPERNOVAE 2010gb, 2010gf, 2010gg

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                                                  Electronic Telegram No. 2378
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
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SUPERNOVAE 2010gb, 2010gf, 2010gg
     Jose L. Prieto, Carnegie Observatories, reports that optical spectra
(range 370-930 nm; resolution 0.7 nm) of 2010gb (cf. CBET 2366), 2010gf (cf.
CBET 2370), and 2010gg (cf. CBET 2371) were obtained with the APO 3.5-m
telescope (+ DIS) on July 18 UT.  After cross-correlation with a library of
supernova spectra using SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), the
following spectral classes were determined:  2010gb is a normal type-Ia
supernova whose best spectral template is that of SN 2003cg at 11 days after
maximum light; 2010gf is a type-II supernova a few weeks after explosion,
with the best-fit spectral template being that of SN 1999em at 20 days after
explosion; and 2010gg is an old type-II supernova.  After correcting for the
recession velocity of the host galaxy of SN 2010gb (UGC 9947, v = 6748 km/s;
Schneider et al. 1992, Ap.J. Suppl. 81, 5), a blueshift of the Si II (rest
635.5 nm) line is measured to be 11000 km/s.  A blueshifted velocity of the
H-alpha P-Cyg profile for SN 2010gf is measured to be 4600 km/s after
correcting for the recession velocity of its host galaxy, UGC 633 (v = 5574
km/s; de Vaucouleurs et al. 1991, Third Reference Catalogue of Bright
Galaxies, via NED).


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                         (C) Copyright 2010 CBAT
2010 July 19                     (CBET 2378)              Daniel W. E. Green