Central Bureau for Astronomical Telegrams
IAUC 5096: 1990ab; 4U 1700-377; 1990c
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Read IAUC 5097
Circular No. 5096
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1990ab IN ANONYMOUS GALAXY
R. H. McNaught, University of Adelaide, reports his discovery
of a supernova in an anonymous galaxy on an R plate taken with the
1.2-m U.K. Schmidt Telescope of the Anglo-Australian Observatory by
P. McKenzie on Sept. 20.5 UT. The supernova (mag about 18) is located
at R.A. = 21h51m00s.42, Decl. = -40 18'27".3 (equinox 1950.0),
or 4".0 east and 8".6 south of the center of the galaxy. No image
appears in this position on UKST J, R, and I, or ESO B and R
survey films.
4U 1700-377
J. Paul, on behalf of the Granat Team (Service d'Astrophysique,
Saclay; Centre d'Etude Spatiale des Rayonnements, Toulouse;
Space Research Institute, Moscow; and Danish Space Research Institute,
Lyngby), reports: "In the course of a 21-hr observation performed
Sept. 12-13 UT, a series of violent hard x-ray outbursts
from 4U 1700-377 was detected by the French Sigma Telescope aboard
the Soviet Granat Space Observatory. The most prominent flare
occurred on Sept. 13d04h13m and reached its maximum approximately
230 s later. The flare duration was approximately 20 min, during
which photons with energy in excess of 120 keV were detected. At
maximum the flare luminosity reached 4 x 10E36 erg/s in the 35- to
75-keV range for a source distance of 1.7 kpc (i.e., a luminosity
greater than the Crab in the same energy window). A further 24-hr
observation of 4U 1700-377 by Sigma is to begin Sept. 27.25.
Beginning Aug. 28, anomalous activity of this source was also
observed in the 5- to 15-keV band by the Danish Watch Instrument,
which is now monitoring this source continuously."
COMET LEVY (1990c)
D. A. Klinglesmith III, Goddard Space Flight Center, reports
the detection of a disconnection event (DE) in comet Levy, as seen
on two CCD images taken Sept. 19.10 UT at the Joint Observatory for
Cometary Research with a 300-mm Nikon lens (+ H2O+ filter at 620.5
nm, FWHM = 5 nm). A disconnected, separated ion tail was seen
approximately 3 x 10E6 km from the head of the comet. The ion tail
also shows several tail rays extending as far as the DE.
1990 September 21 (5096) Daniel W. E. Green
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