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IAUC 4543: Poss. SN IN NGC 4772; 1987A; 1987s; 1987N

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                                                  Circular No. 4543
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

     H. Kosai, Tokyo Astronomical Observatory, reports the discovery
by Yoshiaki Taniguchi of a possible supernova in NGC 4772 (R.A. =
12h51.0, Decl. = +2 27', equinox 1950.0) on a Kiso Schmidt plate
exposed by M. Hamabe and T. Nakamura on Jan. 20.844 UT.  The object
was at mpg about 17 and is about 20" north of the galaxy's center.

     S. Matcher, P. Meikle, B. Morgan, H. Vine, J. Spyromilio, and
D. Blackmore, Imperial College, London, telex:  "We report further
observations of SN 1987A made with the Imperial College speckle
interferometer under good conditions (seeing about 1") at the Anglo-
Australian Telescope on 1987 Oct. 25.7 (at wavelengths 486, 589, and
656 nm with bandwidths of 10, 10, and 9 nm, respectively) and Nov.
25.6 UT (486 nm).  We have made a preliminary search of our data
for the presence of a second source, the circular search fields being
centered on the SN and having radii of 0".47 and 0".83 on Oct. 25
and Nov. 25, respectively; the fields had resolution-limited,
circularly-shaped inner boundaries of radii about 0".03 at 486 nm, rising
to about 0".04 at 656 nm.  No second source was detected at any
wavelength on either date; we estimate that any unresolved second
source lying in our search fields must have been at least 4
magnitudes fainter than the SN in the passbands."

     Total visual magnitude estimates (B = binoculars):  Jan. 14.16
UT, 6.8 (C. E. Spratt, Victoria, BC, 11x80 B); 15.77, 7.3 (W.
Hasubick, Buchloe, W. Germany, 14x100 B); 19.10, 7.0 (C. S. Morris,
Whitaker Peak, CA, 10x50 B; 2 deg 15' tail in p.a. 54 deg); 22.02, 7.9 (V.
F. de Assis Neto, Sao Francisco de Oliveira, Brazil, 11x80 B);
23.25, 6.8 (J. Shanklin, Cambridge, England, 0.20-m refractor);
24.13, 7.5 (Spratt); 31.17, 7.8 (A. Hale, Las Cruces, NM, 10x50 B).

     S. H. Lucas, Midlothian, IL, estimates mag 14.8 from a Jan. 13
blue-sensitive (hypered Konika SR400) exposure.  Visual magnitude
estimates: Jan. 6.4 UT, 14.1 (T. Cragg, Siding Spring Observatory);
7.75, 13.7 (M. Verdenet, Bourbon-Lancy, France); 10.4, 14.5 (Cragg).

1988 February 4                (4543)            Daniel W. E. Green

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