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IAUC 8175: 2003gv; 2003gt, 2003gu; 2003gs; V2573 Oph

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                                                  Circular No. 8175
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)

SUPERNOVA 2003gv IN MCG +05-3-66
     D. Weisz and W. Li report the LOTOSS/KAIT (cf. IAUC 8172)
discovery of an apparent supernova (mag about 18.4), on images from
Aug. 6.5 and 7.5 UT, located at R.A. = 1h08m53s.18, Decl. =
+32o05'59".3 (equinox 2000.0), which is 11".1 east and 0".3 south
of the nucleus of MCG +05-3-66.  A KAIT image from Jan. 24.2 showed
nothing at this position (limiting mag about 19.5).

SUPERNOVAE 2003gt AND 2003gu
     A. V. Filippenko, R. J. Foley, and L. Desroches, University of
California, Berkeley, report that inspection of CCD spectra (range
320-1000 nm), obtained on Aug. 5 UT with the Shane 3-m telescope at
Lick Observatory, reveals that SN 2003gt (IAUC 8172) is of type Ia,
close to maximum brightness.  The expansion velocity measured from
the Si II 635.5-nm absorption line is about 11000 km/s.  SN 2003gu
(IAUC 8173) appears to be of type II, shortly after the explosion;
the continuum is blue and generally featureless, and H_alpha
exhibits a P-Cyg profile.  However, the He I 587.6-nm absorption is
unusually strong; thus, the spectrum somewhat resembles that of a
young type-IIb supernova.  The expansion velocities measured from
the H_alpha and He I absorption lines are about 17000 and 10000
km/s, respectively.

     J. Mikolajewska and A. Szostek, Copernicus Astronomical Center,
Warsaw, report preliminary near-infrared magnitudes for SN 2003gs,
obtained with the 1.55-m Carlos Sanchez Telescope (+ CAIN II) at
Tenerife:  Aug. 1.24 UT:  J = 13.0 +/- 0.1; Aug. 2.22, J = 13.5,
K_s = 13.1; Aug. 3.21, J = 13.6, K_s = 13.1; Aug. 4.21, J = 13.6, H
= 13.0, K_s = 13.0.

     D. K. Lynch, R. J. Rudy, S. Mazuk, and C. C. Venturini, The
Aerospace Corporation; R. B. Perry, Langley Research Center, NASA;
and R. C. Puetter, University of California at San Diego, report
0.9-2.5-micron spectroscopy of V2573 Oph from the Lick 3.05-m
telescope (+ Aerospace Near Infrared Imaging Spectrograph) on July
26.25 UT.  The nova's spectrum showed emission lines of H I, weak
He I (1.0830 and 2.0581 microns), strong O I and N I, and moderate
Fe II.  The first overtone of CO at 2.3 microns was seen weakly in
emission.  No P-Cyg profiles were detected in any line.  The FWHM
of the lines was 1400 +/- 100 km/s.

                      (C) Copyright 2003 CBAT
2003 August 7                  (8175)            Daniel W. E. Green

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