[vsnet-alert 4727] SNe 2000ca and 2000cb

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

Dear SN watchers,

  After about 1 month absense of new bright SN, IAUC 7409 and 7410
tells that two bright (one is potentially) SNe are discovered.

  SN 2000ca was discovered by a group in Univ. Chile on Apr. 28.18 at
16.0pv.  The location is R.A. = 13h35m22s.98, Decl. = -34o09'37".0
(2000.0), which is 0".6 east and 4".7 north of the nucleus of dim Sbc
galaxy ESO 383-32, which is near Abell 3565.  The coordinates and the
offset disagree slightly, but it can be due to the preciseness of the
location of the nucleus.  It lies on the innermost part of the host.

  Note that SN 1997cv was occured in ESO 383-31, which is about 2'.7
south of ESO 383-32.  SN 1997cv was about 19.7V at its discovery.  

  The recession velocities of ESO 383-31 and ESO 383-32 are around
7000 km/s, from which the typical type Ia would be about mag 16.5 at
maximum.  The reported brightness of SN 2000ca (on Apr. 29.27, 16.0V)
is somewhat brighter than this, so the followup is highly encouraged.

  Second, the KAIT team has discovered SN 2000cb in our neighbour.
The location is R.A. = 16h01m32s.15, Decl. = +1o42'23".0 (2000.0),
which is 29".5 west and 4".2 south of the nucleus of SBbc galaxy
IC 1158.   About 15" north of SN, there is a foregroud star (mag about
18).  SN 2000cb is of type II SN, which was revealed by the CfA group
and LBNL group.  

  The recession velocity of IC 1158 is about 2000 km/s, which
indicates that it is quite neighbour.  From the reported mag (185C on
Apr. 24.4 and 180C on Apr. 27.4) and the high expansion velocity, it
should be in the earliest phase and will be able to become more bright
(mag 16 or brighter).  The lack of the narrow NaD absorption (thus the
intersteller extinction) supports it.  Followup photometry is surely
encouraged.  

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

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