Central Bureau for Astronomical Telegrams
IAUC 3734: OPTICAL CANDIDATES FOR THE 1978 Nov. 19 gamma-RAY BURST; N Sgr 1982; N Aql 1982; R Aqr
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Read IAUC 3735
Circular No. 3734
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 617-864-5758
OPTICAL CANDIDATES FOR THE 1978 NOVEMBER 19 gamma-RAY BURST
H. Pedersen and C. Motch, European Southern Observatory,
communicate: "We have made two observations further to those mentioned
on IAUC 3711. The telescope and detector were unchanged.
The first observation was made on 1981 Nov. 26, 27 and 28. A
total of 120-min exposure time (60 min Gunn R, 614-710 nm and 60
min Gunn I, 724-884 nm) gave magnitudes for candidates A and B in
agreement with those on IAUC 3711, which refer to a broader band
(665-1000 nm). The average Johnson R magnitude determined from
all observations made in the period 1981 July 10 to 1982 July 6 is
23.15 +/- 0.35 for A, 23.70 +/- 0.60 for B. The second observation
was made on 1982 Sept. 19, 20 and 21. A total of 390-min exposure
time in the 665-1000-nm band did not reveal any significant change
in the brightness of source A (R = 23.10), while source B disappeared
completely (R >= 24.7), even though the exposure goes deeper
than both the ones reported on IAUC 3711 and the one of 1981 Nov.
The variability of B increases the likelihood that it is the optical
counterpart of the gamma-ray burst source. If this can be proven,
then models involving very-low-mass binaries would be favored,
while lone-neutron-star models would seem excluded."
NOVA SAGITTARII 1982
A. P. Cowley, University of Michigan, reports that a spectrogram
obtained by J. Sowell at the McGraw-Hill Observatory on Oct. 12.1 UT
shows strong emission due to H, Ca II and Fe II, accompanied by weak,
shallow, single absorptions corresponding to a velocity of about
900 km/s and suggesting that the nova is in a very early
post-maximum stage.
NOVA AQUILAE 1982
Visual magnitude estimates by M. Verdenet, Bourbon-Lancy,
France: Sept. 6, 14.6; 9, 14.8: 10, 15.0; 11, 15.0.
R AQUARII
With reference to his remarks on IAUC 3729, S. Tapia, Steward
Observatory, notes that the jet of R Aqr was clearly described by
G. H. Herbig in 1980 (see IAUC 3535).
1982 October 15 (3734) Brian G. Marsden
Read IAUC 3735
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