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[vsnet-campaign-sn 284] SN 2001gd in NGC 5033
Dear SN watchers,
IAUC 7761 informed that very nearby SN was discovered by Japanese
amateur K. Itagaki and the Itarian CROSS program (A. Dimai). It can
reach mag 12 (!) at maximum if it is of type Ia and unreddened. But
further research is needed for the nature of this object, I suppose.
Mr. Itagaki discovered SN 2001gd on Nov. 24.820. He reported that it
was mag 16.5. The existence of the new object was confirmed
immediately by Ms. R. Kushida on Nov. 24.851 (bright twilight), and
she reported it was mag 17.5. The next day, she also observed it and
reported that it was mag 16.2 on Nov. 25.8. A. Dimai independently
discovered it on Nov. 25.21 (mag 16.4). The position of the new
object is measured by Y. Kushida as: R.A. = 13h13m23s.89, Decl. =
+36o38'17".7 (2000.0), which well agrees with that by Dimai. The
object is about 52" west and 161" north (about 2'50" NNW) of the
nucleus of the large spiral (SA(s)c) galaxy NGC 5033. It locates on
the outer northern arm. There are several foreground stars
superimposed on the galaxy, so a careful identification is needed.
On the immediately neighbour of the new object, a point-like source
can be seen on DSS R images of both generation. It is also catalogued
in USNO-A2.0 as: 13:13:23.93 +36:38:19.3 r=18.8 b=19.6. There are
two possibility for this object: the foreground star or the brilliant
star (or HII region) in the host galaxy. And it is unknown whether
the new object is related with this USNO-A2.0 object or not.
This galaxy has produced SN 1985L, which was of type II-L and was
mag 13.0 at maximum. If SN 2001gd is of unreddened type Ia, its
expected maximum is around mag 12. The possibility that SN 2001gd is
fairly old SN is not excluded because it possibly exploded behind the
sun. The followup magnitude estimates and the spectral confirmation
is very urgently needed.
Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp
vsnet-adm@kusastro.kyoto-u.ac.jp
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