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IAUC 4691: 1988Z; 1987A; BZ UMa

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                                                  Circular No. 4691
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

SUPERNOVA 1988Z IN MCG +03-28-022
     C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
with the 0.9-m CERGA Schmidt of a possible supernova in MCG +03-28-022
= Zw 095-049 (R.A. = 10h49m.2, Decl. +16D16', equinox 1950.0).  The
object, at mag 17.4 (15301 emulsion) on Dec. 14.22 UT, is 11" east and
1" south of the galaxy's nucleus.
     E. Cappellaro and M. Turatto, Asiago Astronomical Observatory,
report the independent discovery of this object by G. Candeo on a
plate taken with the 0.67-m Schmidt on Dec. 12.00 UT at B ~ 16.4.  The
offset is given as 11" east, 2" south, and the position is very close
to that of a faint object visible on the Palomar Sky Survey red print.
The object was present at B ~ 16.6 on CCD frames obtained on Dec.
14.13 with the 1.82-m telescope at Cima Ekar.

     R. Sunyaev and the Kvant Team (Space Research Institute of the
U.S.S.R. Academy of Sciences,  Max-Planck-Institut fur
Extraterrestrische Physik and Astronomisches Institut of the University
of Tubingen) report: "The hard x-ray experiment HEXE on board the Kvant
module of the MIR space station detected a continuous decrease of the
x-ray flux from SN 1987A in the energy range 20-120 MeV from April to
November.  The flux in September and October was three times weaker
than that observed in January, when it was at maximum.  In November and
December HEXE detected a further decrease of the hard x-ray flux, which
is now approximately six times weaker than in January."

     G. M. Hurst, Basingstoke, England, communicates: "S. Lubbock,
Bridgend, Wales, reports that the U-Gem star BZ UMa (R.A. = 8h49m53s,
Decl. = +58D00'.0, equinox 1950.0) was observed above minimum with a
0.44-m reflector on Dec. 12.98 UT, when the star was estimated at mv =
14.8.  J. Isles, Limassol, Cyprus, had earlier reported an outburst on
Oct. 22.12 UT at mv = 12.0 that was later confirmed by AAVSO observers.
The data on IBVS 2256 suggest that such events are rare, but the star
clearly requires regular monitoring."

1988 December 15               (4691)              Brian G. Marsden

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