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IAUC 6698: 1997cv; Cep X-4; C/1997 J1; C/1997 J2

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                                                  Circular No. 6698
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)

     The Mount Stromlo Abell Cluster Supernova Search Team (cf. IAUC
6639) reports the discovery of an apparent supernova (V = 19.7, R =
19.4) on CCD images taken on July 7 by S. Chan at the Mount Stromlo
1.27-m telescope (+ Macho Camera).  SN 1997cv is located at R.A. =
13h35m20s.77, Decl. = -34d12'11".6 (equinox 2000.0) apparently in a
large spiral galaxy near Abell 3565.  A nearby star has position end
figures 26s.38, 11'46".6.  SN 1997cv was also present, and comparably
bright, on similar frames taken on July 10, but it is not visible on
images taken on June 10 (limiting R about 21).  Finding charts
are available at http://msowww.anu.edu.au/~reiss/Abell_SNSearch/.

     P. Roche and L. Green, University of Sussex; and M. Hoenig,
Institute of Astronomy, Cambridge, report: "We propose the identification
of the transient 66-s x-ray pulsar Cepheus X-4 = GS 2138+56 (IAUC 2493,
2512, 4575, 4577), with a V = 14.2 Be star, located at R.A. = 21h39m30s.6,
Decl. = +56d59'12".9 (equinox 2000.0), based on positional coincidence
with the ROSAT error circle of Schulz, Kahabka and Zinnecker
(1995, A.Ap. 295, 413).  The object displays Balmer (H-alpha
equivalent width = 5.3 nm) and Fe II emission on a B0 or earlier spectrum,
indicating a strong Be phase.  Given current indications of x-ray
activity from RXTE ASM, optical and infrared monitoring are encouraged."

     Total visual magnitude estimates: May 30.97 UT, 13.2 (R. J.
Bouma, Groningen, The Netherlands, 0.25-m reflector); June 3.90, 12.9
(M. Lehky, Hradec Kralove, Czech Republic, 0.42-m reflector); 7.92,
12.7 (M. Meyer, Frauenstein, Germany, 0.25-m reflector); 9.91, 11.9
(M. Plsek, Lelekovice, Czech Republic, 0.35-m reflector); 29.50, 13.6
(A. Nakamura, Kuma, Ehime, Japan, 0.6-m reflector + CCD).

     Total visual magnitude estimates: June 10.93 UT, 13.3 (Lehky),
23.93, 11.9 (A. Pereira, Cabo da Roca, Portugal, 0.25-m reflector);
28.90, 12.2 (K. Hornoch, Lelekovice, Czech Republic, 0.35-m reflector);
July 3.95, 12.2 (C. Vitorino, Cabo da Roca, Portugal, 0.25-m reflector);
6.11, 12.4 (J. E. Bortle, Stormville, NY, 0.41-m reflector).

                      (C) Copyright 1997 CBAT
1997 July 11                   (6698)              Timothy B. Spahr

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