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IAUC 8167: V2573 Oph; 2003gm IN NGC 5334

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                                                  Circular No. 8167
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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     R. H. McNaught and G. J. Garradd, Australian National
University, report the following precise position from a CCD image
obtained on July 18.53 UT with the Siding Spring 1.0-m f/8
reflector, when the nova appeared at R = 11.2:  R.A. =
17h19m14s.086 +/- 0".08, Decl. = -27o22'35".21 +/- 0".09 (equinox
2000.0; mean of four UCAC1 reductions using 200 reference stars).
     Magnitudes for V2573 Oph estimated by W. Liller, Vina del Mar,
Chile (85-mm f/1.5 Nikon lens + orange filter + Technical Pan film;
uncertainties +/- 0.2 mag):  June 7.117, [11.1; 23.132, 10.4; July
14.985, 11.1.  Additional CCD magnitudes of the nova:  July 18.114,
V = 11.29 (Liller; through clouds); 18.115, V = 11.42 (J. D. West,
Mulvane, KS); 18.116, B = 12.13 (Liller); 18.132, R_c = 10.60
(West); 18.136, [H_alpha] = 0.89 (West); 22.122, V = 11.76 (West);
22.108, R_c = 10.94 (West).  Magnitudes from N. J. Brown, Quinns
Rocks, W. Australia (135-mm f/2 lens + T-Max 400 film):  June 6.60,
[11.5; 18.58, 10.8; July 6.52, 10.5.  Visual magnitude estimates:
July 17.443, 10.8 (M. Linnolt, Honolulu, HI); 19.885, 11.2 (M.
Lehky, Hradec Kralove, Czech Republic); 20.875, 11.4 (Lehky);
22.855, 11.4 (A. Baransky, Pylypovychi, Ukraine); 26.99, 11.8 (J.
Carvajal, Avila, Spain).

2003gm IN NGC 5334
     F. Patat, European Southern Observatory; and A. Pastorello,
INAF-Padova, on behalf of the European Supernova Collaboration,
report that J. Aceituno obtained two spectra (ranges 400-500 and
600-700 nm; resolutions 0.17 and 0.2 nm, respectively) with the
Calar Alto 3.5-m telescope (+ TWIN spectrograph) on July 16.87 UT
of the object given the supernova designation 2003gm (cf. IAUC
8164).  The spectra show a featureless continuum, on which three
emission lines -- identified as H_alpha, H_beta, and H_gamma from
the Balmer series -- are visible, each showing a narrow peak
overimposed on a broader component; the expansion velocities,
deduced from the H_alpha profile, are 300 km/s and 1400 km/s (FWHM),
respectively.  The line peaks are redshifted at 1420 km/s, a value
very similar to the host-galaxy recession velocity (1382 km/s, via
NED).  Even though the overall characteristics are similar to those
of a type-IIn supernova, the distance to NGC 5334 (19.2 Mpc,
assuming H_o = 72 km/s/Mpc) and the observed luminosity (IAUC 8164)
imply that the absolute magnitude is about -14.4 -- i.e., quite low.
This, together with the spectral appearance, seems to indicate that
the object is not a real supernova, but rather an eta-Car-like
event, similar to SN 1997bs (Van Dyk et al. 2000, 112, 1532).

                      (C) Copyright 2003 CBAT
2003 July 27                   (8167)            Daniel W. E. Green

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