[IAUC] CBET 1548: 20081022 : SUPERNOVAE 2008gf, 2008gj, 2008gk, AND 2008gl

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                                                  Electronic Telegram No. 1548
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVAE 2008gf, 2008gj, 2008gk, AND 2008gl
     J. M. Silverman, B. E. Cobb, M. McCourt, A. V. Filippenko, and W. Li,
University of California, Berkeley, report that inspection of CCD spectra
(range 345-640 nm), obtained on Oct. 22 UT with the 3-m Shane reflector (+
Kast) at Lick Observatory, shows that 2008gf (CBET 1537) is a type-II
supernova several weeks past maximum brightness.  After removing the host-
galaxy recession velocity of 7000 km/s, determined from narrow emission
lines, the absorption minimum of H-beta is found to be blueshifted by 9300
km/s; cross-correlation with a library of supernova spectra using the
"SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) indicates that 2008gf is most similar to the type-II supernova 1980K at
44 days past maximum.  SN 2008gj (CBET 1541) is a type-Ic supernova roughly a
week after maximum brightness, in broad agreement with the results reported
on CBET 1546; SNID indicates that it is most similar to the type-Ic supernova
1994I at two days past maximum.  SN 2008gk (CBET 1544) is a type-Ib/c
supernova.  SN 2008gl (CBET 1545) is a type-Ia supernova around maximum
brightness, in agreement with the results on CBET 1547; after removing the
host-galaxy recession velocity of 10198 km/s (Huchra et al. 1999, Ap.J. 121,
287), the absorption minimum of the Si II 635.5-nm feature is found to be
blueshifted by about 13800 km/s.


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                         (C) Copyright 2008 CBAT
2008 October 22                  (CBET 1548)              Daniel W. E. Green