[vsnet-alert 6926] Re: SN 2001ib in NGC 7242

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

Dear SN watchers,

  I have made a mistake on [vsnet-alert 6919]:
>  SN 2001hf is located at: R.A. = 22h15m38s.72, Decl. = +37o17'56".0
   ^^^^^^^^^  SN 2001ib

  I wrote in the same article:
>  It seems to be overluminous even as SN Ia.  
...
>   The expected maximum for the typical unreddened SN Ia in this
> galaxy is mag about 16.0, and the Galactic extinction for this 
> position is expected as large as A_R = 0.4.  So, the observed
> (discovery mag 15.3) brightness is unusually large.  The further
> followup for this SN is highly encouraged.

  IAUC 7773 informed that this SN is of type Ia near maximum light on
Dec. 10, and the spectrum shows some features which are typical for a
somewhat subluminous event.  It is quite remarkable!  The shifts of
absorption lines are consistent that this SN has the same recession
velocity as NGC 7242.  Thus, this galaxy should be nearer (factor ~ 2)
than estimated from v_r.  Further magnitude estimate is very important
for the determination of the decline rate, which is expected to be
faster in the dimmer SN Ia.  

  The magnitude estimates up to now:

  YYYYMMDD(UT)   mag  observer
  20011115.000  <190C (M. Armstrong (from IAUC))
  20011205.813  153:C (R. Arbour (from IAUC))
  20011207.808  153C  (M. Armstrong (from IAUC))
  20011207.844  153C  (R. Arbour (from IAUC))
  20011208.726  153C  (M. Armstrong (from IAUC))
  20011208.805  156CR (C. Leyrat)
  20011208.81  16.11C (CROSS)
  20011208.837   157: (Gary Poyner)
  20011208.896  154:C (Paolo Corelli)
  20011210.890  155:C (Z. Vicar (et al.))
  20011211.943  149CR (F. M. Ewalt)
  20011212.840  154V  (D. Rodriguez)

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

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