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IAUC 5237: 1991Q; 1991R; N Cen 1991

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                                                  Circular No. 5237
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of an apparent supernova located at R.A. = 12h59m43s.11, Decl. =
+27 55'02".8 (equinox 1950.0), found on two films taken Jan. 26.2
and 27.2 UT.  The object (V about 18.0) is offset 5".6 west and 1".8
north from the nucleus of NGC 4926A.  On a film obtained on Apr. 7.0
by A. Maury, the object still seems visible, slightly brighter than
V about 21.  A nearby star of V about 17.5 is at R.A. = 12h59m45s.08,
Decl. = +27 54'08".0.

     R. H. McNaught, Anglo-Australian Observatory, reports his
discovery of a possible supernova of mag about 18 on a U.K. Schmidt J
plate taken Apr. 9.6 UT by P. McKenzie.  Coordinates of the supernova
are R.A. = 15h52m39s.44, Decl. = +19 09'28".2 (equinox 1950.0).
Offsets from the parent galaxy's nucleus are 5".5 west, 8".9 south.
A nearby star of mag 17 has end figures 39s.50, 57".5.  No star
appears in this position on the Palomar prints.  B. Leibundgut and R.
Kirshner, Center for Astrophysics, report:  "J. Huchra and D.
Daugherty, CfA, confirm this object as a supernova at estimated mag
about 18.5, and a spectrogram obtained on Apr. 13.3 UT indicates a
type-Ib/c SN a few weeks past maximum.  The redshift of the galaxy
was measured to be 10500 +/- 200 km/s."

     E. Cappellaro, Padua Observatory; and L. Pasquini, European
Southern Observatory, La Silla, report:  "Photometric magnitudes
obtained by G. Cutispoto (Catania Observatory) with the ESO 1-m
telescope indicate the very red color of this star on Apr. 13.38 UT:  V
= 12.0, B-V = +1.6, V-R = +1.5, V-I = +3.0.  A low-resolution
spectrum (range 400-910 nm, resolution 2 nm) obtained by F. La Franca
(Padua University) and C. R. Goldschmidt (Edinburg University) with
the ESO 1.5-m telescope on Apr. 13.22 UT shows strong emissions of
H I, O I (630, 636, 777, 845 nm), and Ca II (850, 854, 866 nm),
along with many weaker emissions from He I (587, 706 nm), N I (822
nm), C I (908 nm), and several Fe II lines (cf. IAUC 5231).  Due to
the poor resolution the spectral lines are not resolved."

1991 April 13                  (5237)             Daniel W. E. Green

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