[vsnet-alert 5929] SN 2001bt in IC 4830

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

Dear SN watchers,

  Further succeeding bright SN discoveries by amateurs.  SN 2001bt was
discovered by an French (in Reunion islands, south Indian Ocean)
amateur R. Chassagne.  It is his 7th discovery, the latest one was SN
2001ba.  SN 2001bt is a southern object, and now at mag 15.0.

  The position of SN 2001bt reported on IAUC 7633 is: R.A. =
19h13m46s.75, Decl. = -59o17'22".8 (2000.0), and the offset from the
nucleus of the host galaxy is reported as 27".7 west and 17".1 north. 
These values are, however, inconsistent.  If the offset is correct,
R.A. would have end figures 44s.75 or so.  If the coordinate is
correst, the offset would be 14" west.  In any case, SN lies on the
midway between the nucleus and a foreground star GSC 8772.758 (GSCmag
15.1).  

  The host galaxy IC 4830 is a barred-spiral (SB(r)b) galaxy, and SN
is superimposed on the disk region.  The expected maximum of typical
SN Ia is mag about 15.5, but the discovery magnitude (mag about 15.0
at May 24.0 and 24.9 UT) is already exceed this value.  It can be
intrinsically bright SN, or the distance can be nearer than the
estimate from the recession velocity.  Further photometry and spectral
classification is urgently needed.

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

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