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IAUC 4373: 1987E; 1987c; 1986l; GK Per

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                                                  Circular No. 4373
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444

     M. Rosa, European Southern Observatory, La Silla, reports his
discovery with the ESO 1.5-m telescope of a supernova in NGC 4725,
located at R.A. = 12h49m54s, Decl. = +25 34'39" (apparent), or 11" west
and 96" north of the galaxy's nucleus.  The object is in the outer
edge of a spiral arm along with prominent associations, and is 2"
north of a faint red star.  Spectra (8-nm resolution; range 350-980
nm) show broad maxima at 492, 541, 582, 610, and 652 nm, and a
sharp minimum at 591 nm (interstellar?), indicating a type-I SN;
the features and red color suggest it is past maximum brightness.
CCD images on Apr. 24.183 UT yield V = 15.7, B-V = +1.35.  Infrared
photometry by Bouchet at the 1-m telescope is likely contaminated
by the red star:  J = 10.0, H = 9.37, K = 9.07.  BVRI imaging
and Savart plate polarimetry have been obtained at the 3.6-m, 2.2-
m, and Danish 1.5-m telescopes by Macchetto, Miley, Rasmussen, and
Roeser.  Supernovae 1940B and 1969H were also in NGC 4725.

     Total visual magnitude estimates:  Apr. 1.32 UT, 7.0 (V. F. de
Assis Neto, Sao Francisco de Oliveira, Brazil, 10x70 binoculars);
5.78, 7.0 (G. Garradd, Tamworth, N.S.W., 10x50 binoculars); 10.79,
7.0 (D. A. J. Seargent, The Entrance, N.S.W., 15x80 binoculars;
tail about 1 deg long in p.a. 245 deg); 12.80, 7.0 (Garradd).

     Total visual magnitude estimates:  Apr. 3.78 UT, 5.9 (Garradd,
7x50 binoculars; dust tail 25' in p.a. 355 deg, gas tail 35' in p.a.
240 deg, 0.15-m reflector); 11.31, 6.0 (de Assis Neto); 11.80, 5.7:
(R. H. McNaught, Siding Spring Observatory, 2x opera glasses; 4 deg
gas tail in 20x120 binoculars); 17.12, 5.6 (J. Campos, Durban,
R.S.A., 0.13-m refractor); 20.06, 5.4 (Campos).

     Further visual magnitude estimates: 1986 Dec. 17.90 UT, 10.8
(R. Monella, Covo, Italy); 21.20, 10.3 (J. Griese, Stamford, CT);
1987 Jan. 6.09, 11.5 (C. Spratt, Victoria, BC); 27.93, 12.3 (P.
Schmeer, Bischmisheim, West Germany); Feb. 26.7, 11.6 (A. Mizser,
Budapest, Hungary); Mar. 4.7, 13.0 (Mizser); 11.5, 13.0 (S. Sakuma,
Kawasaki, Japan); Apr. 2.2, 13.0 (R. Royer, Wrightwood, CA).

1987 April 24                  (4373)            Daniel W. E. Green

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