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IAUC 8001: Poss. N IN Sgr; 2002gw; Poss. N IN NGC 205

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                                                  Circular No. 8001
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     V. Tabur, Wanniassa, Australian Capital Territory, reports his
discovery of an apparent nova (red mag 9.7) on unfiltered CCD
images taken with a 100-mm telephoto lens on Oct. 25.44 and 25.48
UT.  A CCD image taken by Tabur with a 0.28-m reflector yields the
following precise position:  R.A. = 17h47m21s.74, Decl. =
-23o28'23".1 (equinox 2000.0).  W. Liller, Vina del Mar, Chile,
provides the following position end figures from a CCD image taken
on Oct. 27.1:  21s.63 +/- 0s.05, 21".4 +/- 0".4.  Though the
surrounding star field is crowded, Tabur adds that nothing appears
at this location on Digitized Sky Survey images from 1991 (red) and
1987.  Also, nothing appears at this location on previous images
taken by Tabur on numerous dates back to Aug. 4, the most recent
being Oct. 19.  Magnitude estimates, visual unless otherwise noted:
Oct. 21.1, [11.5 (Liller; red photograph); 26.354, 10.3 (A. Jones,
Nelson, New Zealand); 26.42, 10.5 (Tabur); 26.42, 9.6 (Tabur;
unfiltered CCD); 27.015, 9.98 (Liller; CCD, broadband V).  F.
Marang, South African Astronomical Observatory, reports the
following infrared magnitudes:  Oct. 25.75, H = 7.86, J = 8.36, K =
7.58; 26.74, 7.31, 7.88, 7.07.

     M. Hamuy, Carnegie Observatories, communicates:  "S. Shectman
and I. Thompson, Carnegie Observatories, report that a spectrum
(range 370-540 nm) of SN 2002gw (cf. IAUC 7995), obtained on Oct.
24.25 UT with the Las Campanas Clay 6.5-m telescope (+ Boller &
Chivens spectrograph), shows it to be a type-II supernova with
prominent Balmer lines exhibiting P-Cyg profiles.  I obtained a
spectrum with the Baade 6.5-m telescope (+ LDSS2) on Oct. 25.20
that confirms the previous classification.  The absorption
component of the H-alpha line yields an expansion velocity of 9300
km/s, based on a redshift of 3100 km/s derived from the narrow
Balmer emission lines of the host galaxy."

     H. Yamaoka, Kyushu University; and T. Kato, Kyoto University,
report additional CCD magnitudes for this object (cf. IAUC 7984):
Oct. 4.630 UT, about 17.0 (Y. Mashitani, Tenkawa, Nara, Japan;
prediscovery; via N. Fukuhara, Hyogo); 7.778, R = 18.5 (Z.
Kereszty, Gyorujbarat, Hungary); 8.552, 18.1 (Y. Sano, Hokkaido,
Japan).  Yamaoka and Kato suggest it might be in a pre-maximum halt
phase, exceptional for a very fast nova.

                      (C) Copyright 2002 CBAT
2002 October 27                (8001)            Daniel W. E. Green

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