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IAUC 2914: 1976a; 1975n; STRONG X-RAY BURST; V1500 Cyg

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                                                  Circular No. 2914
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

     William A. Bradfield, Dernancourt, near Adelaide, reports the
discovery of a new comet.  The following observations are available:

     1976 UT          R. A. (1950) Decl.     m1     Observer
     Feb. 19.49       1 55.0     -33 17      9      Bradfield
          20.483      1 59.0     -32 43     10      Tregaskis
          20.500      1 59.5     -32 45     10      Curnick

W. A. Bradfield (Dernancourt).  Comet diffuse without condensation.
T. B. Tregaskis and Curnick (near Melbourne).  Comet diffuse without
   condensation.  Communicated by J. B. Trainor.

COMET WEST (1975n)
     Recent total visual magnitude estimates from New Zealand: Feb.
11.35 UT, 4.5 (A. C. Gilmore, Wellington, 10 x 50 binoculars; tail
1o in p.a. 110o); 12.36, 4.2 (M. Stewart, Raumati Beach, 7 x 50
binoculars); 16.34, 3.8 (Stewart); 17.36, 3.7 (Stewart); 19.35,
3.2 (P. M. Kilmartin, Wellington, 10 x 50 binoculars).

     W. H. G. Lewin, Massachusetts Institute of Technology, reports
that the SAS-3 Group detected a strong x-ray source at R.A. = 6h15m.6,
Decl. = +9o.3 (radius of error circle 0o.2) around Feb. 12d20h17m UT.
During the observations, which lasted about 75s, the average source
intensity in the range 1.3-5 keV was about one-third that of the
Crab Nebula, and the spectrum softened significantly.  About 100m
earlier and later the source was not detected, and the intensity
must therefore have been less than about 0.07 that of the Crab.
The position is consistent with that of 3U 0614+09; the maximum
intensity listed for that source is about 0.07 that of the Crab.

     Further selected recent visual magnitude estimates: Jan. 7.09
UT, 10.3 (J. Bortle, Brooks Observatory); 15.97, 9.9 (P. Collins,
Harvard College Observatory); 23.05, 10.0 (P. Maley, Houston, Texas);
30.75, 10.2 (R. Lukas, Wilhelm Foerster Observatory); Feb.
2.75, 10.2 (Lukas); 8.04, 10.2 (Maley); 9.98, 10.2 (Collins).

1976 February 20               (2914)              Brian G. Marsden

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