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IAUC 4323: 1987A; CH UMa; 1986l

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IAUC number 

                                                  Circular No. 4323
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     C. Castagnoli, Istituto di Cosmogeofisica, Turin, telexes: "A
signal was detected on Feb. 23.124 UT at the Mont Blanc Neutrino
Observatory.  The signal consists of five pulses, above the 7-MeV
energy threshold over an interval of 7 seconds.  This is in agreement,
both in energy and duration, with predictions of collapsing
iron-core standard models at 50 kpc.  The probability of a random
occurrence with SN 1987A is 1 per 10**4 yr.  The neutrino telescope,
running since 1984 Oct. at 5000 meters water equivalent underground,
in a collaboration between our Institute and G. Zatsepin's
group at the Institute of Nuclear Studies in Moscow, consists of
90 tonnes of liquid scintillator in 72 counters shielded with 200
tonnes of iron slabs."
     P. Andreani and A. Vidal-Madjar, Institut d'Astrophysique,
Paris, using the CAT+CES+reticon spectroscopic device at the European
Southern Observatory, La Silla, have identified the following
eleven intervening main structures in the direction of the supernova
(3 km/s resolution): 7-22 km/s (heliocentric), strong Na I,
Ca II, K I; 38 km/s, weak Ca II; 55-63 km/s, strong Ca II, weak Na
I; 70-74 km/s, same; 121-127 km/s, strong Ca II; 160-169 km/s,
same; 206-218 km/s, strong Ca II and Na I; 248-253 km/s, weak Ca
II and Na I; 264-269 km/s, same; 278-283 km/s, strong Ca II, Na I,
K I; 293 km/s, weak Ca II.  Many of these main structures are
resolved into two or three nearby components.  In particular, the
7-22 km/s structure clearly shows three distinct components.


CH URSAE MAJORIS
     G. M. Hurst, Basingstoke, England, communicates the following
observations indicating this object to be above minimum and
exhibiting rapid fluctuations: Feb. 20.812 UT, 14.4 (S. Lubbock,
Bridgend, Wales); 20.888, 13.7 (M. Gainsford, Burbage, England);
20.904, 14.2 (Lubbock); 20.910, 13.7 (Hurst).


COMET WILSON (1986l)
     Total visual magnitude estimates: Feb. 21.77 UT, 8.1 (R. H.
McNaught, Coonabarabran, N.S.W., 20 x 120 binoculars); 22.77, 8.3
(G. Garradd, Tamworth, N.S.W., 0.15-m refl.); 27.49, 8.9 (E.
Jacobson, Evansville, MN, 20 x 80 binoculars); 28.48, 8.7 (Jacobson).


1987 February 28               (4323)              Brian G. Marsden

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