Central Bureau for Astronomical Telegrams
IAUC 5569: 1992al; GAMMA-RAY BURST
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Circular No. 5569
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
SUPERNOVA 1992al IN ESO 234-G69
R. H. McNaught, Anglo-Australian Observatory, reports his
discovery of a supernova (mag about 16) in ESO 234-G69 on an R plate
taken by Q. A. Parker with the U.K. Schmidt Telescope on July 27.6
UT. The supernova is situated at R.A. = 20h42m19s.37, Decl. =
-51 34'38".0 (equinox 1950.0, uncertainty 0".5 in R.A., 0".3 in
Decl.) with offsets from the galaxy's center being 18" east, 12"
south. A star of similar brightness, on the opposite side of the
galaxy, has end figures 13s.98, 33'35".0.
M. Della Valle, European Southern Observatory; and H. Lorenz,
Astrophysical Institute, Potsdam, report: "A CCD spectrogram
(range 400-800 nm, resolution about 1.5 nm), obtained on July 29.3
UT with the New Technology Telescope at La Silla, shows this to be
a type-Ia supernova. The spectrum shows the typical absorptions of
Si II (635.5 nm, measured at 620 nm; and 564 and 545.4 nm) and Mg
II (448.1 nm)."
M. M. Phillips, Cerro Tololo Interamerican Observatory; and A.
Alonso, Columbia University, communicate: "We obtained a spectrogram
(range 320-760 nm) of SN 1992al in ESO 234-G69 with the CTIO
4.0-m telescope on July 29.3 UT. The data show that this object is
a type-Ia event near maximum light. A spectrum obtained of the
nucleus of ESO 234-G69 shows narrow H-alpha, [N II], and [S II]
emission lines along with Ca II H and K absorption at a redshift of
z about 0.0145."
GAMMA-RAY BURST
T. L. Cline, Goddard Space Flight Center, NASA, on behalf of
the Ulysses/Compton/PVO Interplanetary Network team for the
triangulation of gamma-ray bursts (see IAUC 5565), communicates: "We
report the source location of the gamma-ray burst that passed the
Earth's center on July 20.133394 UT: R.A. = 13h31m46s, Decl. =
+36 44'.4 (equinox J2000.0); the elliptical field of maximum
likelihood is nearly vertically slanted, varying in R.A. by up to 3'
and in Decl. by up to about 5'. This source field will be reduced
with further analysis; however, it is adequately precise such that
we do encourage immediate follow-up observations at other energies.
This is the second of at least three gamma-ray bursts in July for
which we shall be able to obtain accurate source locations with the
network."
1992 July 29 (5569) Daniel W. E. Green
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