Central Bureau for Astronomical Telegrams
IAUC 3711: OPTICAL CANDIDATES FOR THE 1978 Nov. 19 gamma-RAY BURST; N Aql 1982; 1982g
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Circular No. 3711
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, M. Tarenghi, P. Grosbol and J. Danziger, European
Southern Observatory; G. Pizzichini, Bologna; and W. H. G. Lewin,
Massachusetts Institute of Technology, communicate: "We have made
four observations during 1981-1982 of two optical sources in the error
box for the optical flash which may have been associated with
the source of the 1978 Nov. 19 gamma-ray burst (Schaefer 1981, Nature
294, 722). The observations were made with a CCD-camera and the
1.54-m Danish telescope at the European Southern Observatory.
Source A is a possibly-extended object within 2" of the center of
the error box. Observing in a wide, red band (665-1000 nm), we
found the average magnitude to be 8.1 (+/- 0.3) fainter than star No.
11 of Fishman et al. (1981, Astrophys. Space Sci. 75, 135); this
was determined from 20-, 45-, 60- and 30-min exposures on 1981 July
10 (B = 24.3 +/- 0.6, B-V = 0.5 +/- 1.0), 1982 July 3, 4 and 6, respectively.
No definite claim can be made as to variability, although
the source appears to have been faint on 1982 July 3 and 4. Source
B is a starlike object ~ 3" west and 1" south of source A, and in
the red band it is ~ 0.7 mag fainter than A; it is invisible on the
B and V exposures. Either A or B may be identical with a faint
stellar image found by M. Liller (Schaefer, op. cit.). The optical
identification of the gamma-ray burst source will probably have to be
based on studies of variability. Other observers are therefore encouraged
to monitor the above-mentioned two candidates."
NOVA AQUILAE 1982
R. D. Gehrz, J. A. Hackwell and G. L. Grasdalen, Department of
Physics and Astronomy, University of Wyoming, report the discovery
of a 10-um feature in the infrared spectrum of Nova Aql 1982. Circular
-variable-filter spectra from 8-13 um taken on Apr. 17 and
June 10 identify the feature as being due to emission by SiC grains.
Infrared photometry at the Infrared Observatory on July 3 gave:
2.3 um, 7.1; 3.6 um, 4.6; 4.9 um, 3.7; 8.7 um, 2.4; 10.0 um (N-band),
1.4; 11.4 um, 0.9; 12.6 um, 0.8; 20.0 um, 1.0.
COMET AUSTIN (1982g)
V. F. de Assis Neto, Sao Francisco de Oliveira, Brazil, has reported
the following total visual magnitude estimates, made with a
0.1-m reflector: July 2.31 UT, 9.4; 3.35, 9.4 (coma diameter 2'.0).
1982 July 14 (3711) Daniel W. E. Green
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