[vsnet-alert 5859] Re: SN 2001bb and other SNe

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

cf. vsnet-alert 5854
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/alert5000/msg00854.html

Dear SN watchers,

  IAUC 7616 informed that the spectra of SN 2001bb have been taken by
Lick and KPNO, which reveal that it is of type I SN, but the subclass
is not yet uncertain.  It can be a luminous SN Ia, or hypernova.

  On the disk of the host galaxy IC 4319, there is a bright foreground
star GSC 6727-739.  Its GSCmag (nearly blue mag) is 14.35 +/- 0.37,
and absent from USNO_A2.0.  So this magnitude should not be used for
the comparison with unfiltered or red(or yellow)-filtered CCD image.
The temporal comparison stars (extracted from USNO_A2.0) is available
at http://vsnet.ggw.org/asras/snimages/reference/i4319.jpg .

  SN 2001bb is about at the half way between this star and the nucleus
of the galaxy.  The discovery image can be seen at:
  http://astron.berkeley.edu/~bait/2001/sn2001bb.html 
, whose "star 1" is GSC 6727-739.

  The follow-up magnitude estimate (and of course the spectral
follow-up) is extremely urged for this "peculier" SN.

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

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