[vsnet-alert 4034] Re: SN2000B ??

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

cf. [vsnet-alert 4025] [vsnet-alert] SN2000B ??
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-alert/msg04025.html
cf. [vsnet-alert 4029] Host galaxy of possible SN in NGC2320
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-alert/msg04029.html
cf. [vsnet-chart 255] Chart of possible SN in NGC2320
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chart/msg00255.html
cf. [vsnet-chart 256] Re: Host galaxy of possible SN in NGC2320
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chart/msg00256.html

Dear SN watchers,

  In these days, the announcement by IAUC of the discovered supernovae
seems to delay some.  The SN scientists, including me, strongly urge
the earlier information (confirmation, spectrum, magnitude estimates,
and so on) after SN discoveries, because earlier phase cannot be
reproduced by later observations.  We, the SN hunters, the SN
observers, and the scientists, should have to explore the finest way
of the reporting, announcement, and the follow-up.

  As reported on [vsnet-alert 4025], a French observer P. Antonini
(AUDE) has discovered an apparent supernova (mag 16.5C) in NGC 2320.
The position measured by the discoverer is: R.A = 07h05m40s.73, Decl.
= +50o35'10".5 (2000.0), which is about 12" west and 18" north of the 
nucleus of the host elliptical galaxy NGC 2320.  The confirmation was
made by several observers, including F. Colas with Pic Du Midi 1.05-m
telescope.  The AUDE has provided some images of this SN on (in
French): http://aude.geoman.net/observation/SN/Meth00B.htm , and the  
informations are collected in the D. Bishop's fine page: 
http://vsnet.ggw.org/asras/snimages .  On the confirmation images, an
apprent SN has slightly brightened to 16.2C or so.

  In the field of NGC 2320, there are some foreground stars.  The
offsets from the nucleus of NGC 2320 are roughly tabled as:

SN  12"W, 18"N  <7h05m40s.73, +50o35'10".5>
A    0"E, 40"N  GSC 3399-1067 (GSC mag 14.2)
B   18"W,  2"S  USNO 1350_07123142 (mag ~17.0)
C    2"W, 22"S  USNO 1350_07123333 (mag ~17.0)
D   16"W,  5"N  --- (mag ~18.0)
E    2"E, 18"N  --- (mag ~19.0)

  SN is definitely brighter than star B or C, but dimmer than star A
on the discovery image.  SAO 26147 = BD +50 1390 (V = 9.00) is there
at about 77" east and 49" north of NGC 2320, which would be a obstacle
for CCD observer.  

  There is another galaxy NGC 2322 (inclined SBa) about 5' southeast
of NGC 2320.  The recession velocities of these two are around 6000
km/s, which indicate that typical SNeIa on these galaxies would have
the maximum at mag 16.0 or so.  Follow-up observations (and check of
the pre-discovery images) is urged.

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

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