[vsnet-campaign-sn 483] spectral types of recent SNe

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

Dear SN watchers,

  IAUC 7988 informed spectral types of several recent SNe:

SN 2002gb:
In [vsnet-obs 41749] (Oct. 05):
>SN2002gb  20011005.0  <205C  PAL
>SN2002gb  20020816.0  <205C  PAL
>SN2002gb  20020828.26  189C  PAL
>SN2002gb  20020909.0   194C  PAL
>SN2002gb  20021003.0   195C  PAL
>
># SN 2002gb (22:43:21.31, -0:06:53.0, J2000.0) is located 1".4 due
># north of an apparent anonymous host galaxy.  About 2' from SN,
># there is a distant galaxy 2MASXi J2243151-000758, whose recession
># velocity is 16734 km/s.  If SN 2002gb has the same distance as this
># galaxy, the expected maximum for typical SN Ia is mag about 18.5
># (or somewhat brighter), so SN 2002gb seems less luminous.

  Spectra taken at Las Campanas and Keck-I (Oct. 8) revealed that it
is type Ia SN about 20-30 days after maximum light.  The recession
velocity of the galaxy was measured as 22000 km/s.

SN 2002gc:
In [vsnet-obs 41749] (Oct. 05):
>SN2002gc  20010903.0  <190C  Bol
>SN2002gc  20021003.88  174C  Bol
>SN2002gc  20021004.845 173C  Bol
>
># UGC 1394, a host galaxy of SN 2002gc, is a spiral (Sa) galaxy near
># the Galactic plane (b=-15o).  The expected maximum for typical SN Ia 
># is mag about 16.6.  

  The UCB team took a spectrum with Keck-I telescope on Oct. 8, which
shows it is a type Ia SN with some peculiarities,  A Si II/Ti II
580-nm absorption feature (typical for subluminous SN Ia) was
prominent, but Ti II 420-nm absorption (also seen in subluminous SN
Ia) was absent.  Such characteristics resembles that of SN Ia 2002eu
which had a normal luminosity.

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