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Back Circular No. 6006 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) GX 339-4 R. Sood, Australian Defence Force Academy, Canberra; and D. Campbell-Wilson, Molonglo Radio Observatory, University of Sydney, communicate: "We report the detection of radio emission from the x-ray source GX 339-4 (4U 1658-48). Observations of this previously- radio-quiet black-hole candidate were made with the Molonglo Observatory Synthesis Telescope at 843 MHz, imaging a 23' x 31' field with 44" resolution. The time-averaged flux between May 25.35 and 25.85 UT was 10.0 +/- 0.7 rms mJy. The observations were repeated during the following week with these results: June 1.35- 1.60, 6 +/- 0.9 rms mJy; 2.41-2.60, 7.0 +/- 1.3; 3.35-3.84, 6.8 +/- 0.7. Preliminary data analysis does not reveal, within the constraints of our resolution, the extended radio jet structure for GX 339-4 predicted by Miyamoto and Kitamoto (1991, Ap.J. 374, 741)." COMET TAKAMIZAWA-LEVY (1994f) Extension to ephemeris on IAUC 5997: 1994 TT R. A. (2000) Decl. Delta r Elong. Phase m1 June 12 13 30.93 +65 19.9 1.117 1.392 81.4 46.1 8.7 17 12 46.26 +60 32.9 1.225 1.410 77.4 44.7 8.9 22 12 19.88 +55 58.8 1.344 1.431 73.2 42.8 9.2 27 12 03.43 +51 55.1 1.469 1.455 68.9 40.7 9.5 July 2 11 52.70 +48 23.0 1.597 1.483 64.7 38.3 9.7 7 11 45.52 +45 19.1 1.727 1.513 60.6 35.8 10.0 12 11 40.67 +42 39.1 1.854 1.546 56.5 33.2 10.2 17 11 37.42 +40 19.0 1.979 1.581 52.5 30.6 10.5 22 11 35.30 +38 15.6 2.100 1.618 48.5 28.1 10.7 27 11 34.03 +36 26.0 2.217 1.657 44.7 25.5 10.9 Aug. 1 11 33.38 +34 47.9 2.328 1.698 41.0 23.1 11.1 6 11 33.23 +33 19.7 2.433 1.740 37.5 20.8 11.3 Total visual magnitude estimates (cf. IAUC 5992): May 29.94 UT, 8.4 (A. Diepvens, Balen, Belgium, 0.15-m refractor); June 1.90, 8.7 (K. Sarneczky, Budapest, Hungary, 20x60 binoculars); 8.27, 8.0 (C. E. Spratt, Victoria, BC, 0.20-m reflector). 1994 June 9 (6006)