Central Bureau for Astronomical Telegrams
IAUC 5112: V1333 Aql; 1987A; 1988Z
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Read IAUC 5113
Circular No. 5112
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
V1333 AQUILAE
R. M. Hjellming and X. Han, National Radio Astronomy Observatory;
and D. Roussel-Dupre, Los Alamos National Laboratory, write:
"Following the report of an optical outburst of V1333 Aql (= Aql
X-1) reported on IAUC 5036, we observed this object with the Very
Large Array. A rapidly decaying radio source, of the type known for
the x-ray transients A0620-00, GS 2000+35, and Cen X-4, was observed
at 8.4 GHz and found to be 0.4 mJy on Aug. 8, 0.13 mJy on Aug. 26,
and < 0.1 mJy on Sept. 20."
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
R. Sunyaev, on behalf of the GRANAT Team (Space Research Institute,
Moscow), reports: "The observations with the coded mask imaging
spectrometer ART-P on Sept. 23 gave a 3-sigma upper limit on the
supernova x-ray flux 0.8 mCrab in the energy band 3-15 keV. Assuming
a flat spectrum, the obtained limit corresponds to the following
fluxes in various energy bands: 4 x 10E-4 phot sE-1 cmE-2 keVE-1
(3-6 keV), 1 x 10E-4 (6-15 keV), and 1.3 x 10E-4 (15-30 keV). These
limits are of interest in connection with the recent discovery of
radio emission from SN 1987A (IAUC 5086). Only two sources, LMC X-1
and the 50-ms pulsar PSR 0540-693, were detected in the 3.4 deg x 3.6
deg field around SN 1987A."
SUPERNOVA 1988Z IN MCG +03-28-022
R. A. Sramek, National Radio Astronomy Observatory; K. W.
Weiler, Naval Research Laboratory; and N. Panagia, Space Telescope
Science Institute, report radio detection of SN 1988Z. Observations
made on 1990 Feb. 12 with the Very Large Array in A/D
configuration at 6-cm wavelength (4.9 GHz) show no detection to a
limit (3 sigma) of < 0.42 mJy. Observations made on 1990 May 29 in
A configuration at 6-cm wavelength (4.9 GHz) show detection of a
1.21-mJy (+/- 0.07 mJy) radio source at R.A. = 10h49m10s.62, Decl. =
+16 15'56".4 (equinox 1950.0; +/- 0".2 in each coordinate), coincident
to within the errors of the optical supernova position (cf.
IAUC 4900). Further observations made on July 12 in A/B configuration
show a limit (3 sigma) of < 0.36 mJy at 20-cm wavelength (1.45
GHz), a detection of 0.95 mJy (+/- 0.08 mJy) at 6-cm wavelength (4.9
GHz), a detection of 0.58 mJy (+/- 0.06 mJy) at 3.6-cm wavelength
(8.4 GHz), and a limit (3 sigma) of < 0.70 mJy at 2-cm wavelength
(14.6 GHz). Radio monitoring is continuing.
1990 October 10 (5112) Daniel W. E. Green
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