[vsolj-alert 110] Possible SN in M96

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

　Ｍ９６に明るい超新星らしき天体が発見された模様です。発見者はイタリアの
　Mirko Villiです。まだIAUCは発行されていませんが、近傍銀河で初期観測が
　大変貴重であることから、Brian Skiffとの相談の上vsnet-alertで広報するこ
　とにしました。現在増光中。もしIa型であれば１０等台も期待できます。

　この辺で山岡さんにバトンタッチかな？

From owner-vsnet-alert@kusastro.kyoto-u.ac.jp Sun May 10 16:39 JST 1998
Date: Sun, 10 May 1998 00:36:36 -0700
From: bas@lowell.Lowell.Edu (Brian Skiff)
Subject: [vsnet-alert 1755] Supernova in NGC 3368 = Messier 96

     Mirko Villi in Italy has found (on May 9.9 UT) an apparent supernova
in the bright galaxy Messier 96.  He reports that it is located about 50 arcsec
north of the center of the galaxy and about mag. 13.5.
     I have made a visual confirmation of this object using the Lowell 53cm
telescope at May 10.33 UT.  The position estimate seems to be correct based
on offsets using the telescope's photometer diaphragms.  If anything, the
star has become quite a bit brighter in the intervening 6-8 hours, and must
be at least mag. 12.5 if not 12.0---because of the Full Moonlight and high
aerosols scattering it, I could see nothing in the field except the galaxy
nucleus and the new star.
     There is no asteroid here in either the Minor Planet Center's search
widget or from our local asteroid database.  The object does not appear on
various images of the galaxy (Vickers, Hubble/Carnegie, POSS, Wray color
atlas, etc.).

\Brian

　次は周辺比較星情報です。

From owner-vsnet-alert@kusastro.kyoto-u.ac.jp Sun May 10 17:11 JST 1998
Date: Sun, 10 May 1998 01:08:28 -0700
From: bas@lowell.Lowell.Edu (Brian Skiff)
Subject: [vsnet-alert 1756] T&B sequence around Messier 96

     As far as I know, there is no published photometric sequence around
M96.  On the relevant chart from the Thompson & Bryan "Supernova Search Charts"
are shown V magnitudes evidently from several professional observers.  Below
are the positions and IDs for these stars (except a faint star very close to
the galaxy).  The name indicates the magnitude rounded to 0.1, e.g. "114"
means V = 11.4.

ID       RA  (2000)  Dec        GSC
114   10 46 23.9  +11 56 54  0849-0685
126   10 46 21.7  +11 44 29  0849-0703
131   10 46 32.7  +11 50 55  0849-0841
135   10 46 10.4  +11 42 50  0849-0887
143   10 46 52.9  +11 43 22  0849-0306
149   10 46 52.9  +11 52 42  0849-0206
150   10 46 32.7  +11 52 06  0849-0931

T&B give the sources for this data as Peter Birch et al. (Perth Observatory,
Western Australia), Bill Liller and Gonzalo Alcaino (CTIO?), and Marion Frueh
(probably McDonald Observatory).
     Since I complain that the IAUC's don't give a precise position for the
host galaxies of supernovae, the center of M96 is at:  10 46 45.6  +11 49 18
(2000), according to NED, which cites 1996 ApJS 107, 215, and claims an
accuracy of +/- 5 arcsec.

\Brian

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