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IAUC 3590: N CrA 1981; A0538-66; 1980u; 1980i

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                                                  Circular No. 3590
Central Bureau for Astronomical Telegrams
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

     Y. Kozai and H. Kosai, Tokyo Astronomical Observatory, telex
that an object, probably a nova, has been discovered by Minoru
Honda, Kurashiki, as follows:

     1981 UT          R. A. (1950) Decl.     mv
     Apr.  2.75104   18 38.5     -37 35      7.0

The object, located near the semiregular variable AM CrA, was not
visible on exposures obtained on 1980 Sept. 15, 16, 28 and 1981 Apr. 1.
     In response to a request from the Central Bureau, T. Cragg,
Anglo-Australian Observatory, has confirmed the nova as follows:
Apr. 6.77 UT, mv = 7.4.

     G. Clayton, University of Toronto; and I. Thompson, University
of Western Ontario, communicate: "Unfiltered optical linear polarization
observations of the x-ray transient A0538-66 were obtained
with the 1-m Swope telescope at the Las Campenas Observatory during
Mar. 5-13.  The object showed no polarization during the quiescent
phase, but the polarization increased to ~ 1.7 percent, coincident
with an outburst that occurred during Mar. 8-11.  The increase in
polarization was accompanied by a rotation of 30o in position

     Total visual magnitude estimates: Feb. 17.15 UT, 8.9 (M. Antal,
Piestny, Czechoslovakia, 25 x 100 binoculars); 25.93, 8.7 (Antal);
Mar. 2.13, 8.7 (C. E. Spratt, Victoria, BC, 0.20-m reflector); 9.15,
8.1 (Spratt; tail 15' in p.a. 30o); 12.18, 8.4 (J. Bortle, Stormville,
NY, 0.32-m reflector, tail 7' in p.a. 70o); 18.14, 8.9
(Spratt, 0.25-m reflector); 20.82, 8.3 (J.-C. Merlin, Le Creusot,
France, 0.15-m reflector); 26.10, 8.4 (Bortle, 20 X 80 binoculars).

     Total visual magnitude estimates by Spratt (0.25-m reflector):
Mar. 6.15 UT, 9.8; 8.16, 10.0; 10.15, 10.4; 18.15, 10.9.

1981 April 7                   (3590)              Brian G. Marsden

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