[vsnet-campaign-sn 285] SNe Ia 2001gb and 2001gc

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

Dear SN watchers,

I wrote:
># The host galaxy of SN 2001gb = IC 582 (spiral) makes a pair with IC
># 583.  It superimposes on the outermost region of the peculiar-shaped
># disk.  The expected maximum for typical SN Ia is mag about 16.7.  

  This SN was revealed to be of type Ia near maximum light by the CfA
group (IAUC 7761). 

># SN 2001gc locates about 9" east-southeast of the nucleus of the host
># galaxy = UGC 3375 (SA(rs)c), superimposed on the inner part of the
># disk.  There is a foreground star (mag about 14) about 18" northeast
># of the nucleus.  The expected maximum for typical SN Ia is mag about
># 16.1.  

  The CfA team also revealed that this SN is of type Ia having larger
expansion velocity than usual.  They commented that the expansion
velocity (16600 km/s) suggests this SN to be well (~2 weeks) before
maximum, but the inspection of their spectrum
(http://cfa-www.harvard.edu/cfa/oir/Research/supernova/spectra/sn2001gc-20011122.flm.gif)
shows that it is probably near maximum but has the larger expansion
velocity.  Such a large expansion velocity is typical for the
intrinsically bright SN Ia.  The follow-up photometry of this object
during next several months are quite important.

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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