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[vsnet-campaign-sn 642] SN II 2003gd and its progenitor (IAUC 8152)

Dear SN watchers,

In [vsnet-campaign-sn 638] (June 14):
>  The first spectrum was taken on the same night at America, i.e. June
>13.46 UT = 0.64 days after discovery.  The IR spectrum shows a series
>of strong and broad hydrogen Paschen emission lines, which indicates
>that is it a type II SN around maximum.  The explosion can occured
>when it was behind the Sun.  We are possibly able to enjoy the bright
>SN for some weeks.  

  Optical spectra taken by W. Herschel Telescope and Baade telecope
on June 14 UT indicate that it is really a type II SN about 1-2 month
after explosion. 

  A better position of SN 2003gd is reported as R.A. = 1h36m42s.65,
Decl. = +15o44'19".9 (J2000.0).

  The archived images taken by HST and Gemini North show the probable
progenitor of SN 2003gd.  Its magnitudes are: V=26.1 +/- 0.15, I ~
23.8, which suggest that it is a red (spectral type M) supergiant (M_V
= -3.5, log L/Lsun ~ 4).  It seems to be a relatively low mass star
(about 8-10 M_sun).  

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan

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