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IAUC 8465: 2004gw, 2005B, 2005D, 2005E, 2005F, 2005G

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                                                  Circular No. 8465
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVAE 2004gw, 2005B, 2005D, 2005E, 2005F, 2005G
     Further to IAUC 8459, J. Graham and W. Li report the LOSS
discovery of three apparent supernovae on unfiltered KAIT images:

SN      2005 UT        R.A.  (2000.0)  Decl.    Mag.     Offset
2005E   Jan. 13.22    2 39 14.34  + 1 05 55.0   16.8   139" W, 19" N
2005F   Jan. 13.42    9 04 53.68  +13 33 56.3   17.7   52" E, 14" N
2005G   Jan. 14.60   13 44 32.79  + 4 46 44.3   16.5   13".4 W, 12".0 N

Additional unfiltered CCD magnitudes (KAIT unless otherwise noted):
SN 2005E in NGC 1032, 2004 Dec. 19.20, [19.0; 24.23, [18.0; 2005
Jan. 14.10, 16.8 (M. Schwartz, 0.8-m Tenagra II telescope); 14.20,
16.8.  SN 2005F in MCG +02-23-27, 2004 Dec. 17.43, [19.5; 2005 Jan.
13.91, 17.8 (O. Trondal, Oslo, Norway, 0.25-m telescope); 14.43,
17.8.  SN 2005G in UGC 8690, 2004 June 25.20 UT, [19.0; 2005 Jan.
15.56, 16.5.
     R. J. Foley and A. V. Filippenko, University of California,
Berkeley, report that inspection of CCD spectra (range 320-920 nm),
obtained on Jan. 15 UT with the Keck I 10-m telescope (+ LRIS),
reveals that SN 2005E is of type Ib/c, close to (or perhaps a few
days before) maximum brightness.  The presence of weak He I
absorption lines favors the type-Ib classification, although the
differences between type-Ib and -Ic supernovae can be difficult to
discern at early times.  SN 2005F is of type Ia, about 2.5 weeks
past maximum.  Adopting the NED redshift of 8545 km/s, the minimum
of the 635.5-nm Si II feature is at a velocity of 10700 km/s.  SN
2004gw (IAUC 8459) is probably of type Ia, 3-4 weeks past maximum
brightness, although it exhibits a number of spectral peculiarities
that render the classification uncertain.  SN 2005D (IAUC 8464) is
of type II, roughly a month after the explosion.  H_alpha has a
classic P-Cyg profile, and the other Balmer and Fe II lines are
strong.  Adopting the NED redshift of 8505 km/s, the ejecta
velocity measured from the H_alpha absorption minimum is unusually
large, about 13000 km/s.  Weak He I absorption lines are present,
suggesting that the object is specifically of type IIb; indeed, its
spectral characteristics are similar to those of the first-reported
spectrum of SN 2004ex (IAUC 8420), which eventually developed
prominent He I lines (IAUC 8446), although SN 2005D has stronger He
I absorption and a redder continuum, consistent with it being
somewhat older than SN 2004ex.
     Corrigendum.  On IAUC 8462, 'Supernova 2005B in UGC 11066',
line 9, *FOR*  SN 2005A  *READ*  SN 2005B

                      (C) Copyright 2005 CBAT
2005 January 15                (8465)            Daniel W. E. Green

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