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IAUC 3671: SNe; A0538-66

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                                                  Circular No. 3671
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

     B. Szeidl, Konkoly Observatory, telexes that M. Lovas has
discovered two supernovae, one 92" west and 23" north of the nucleus
of an anonymous galaxy at R.A. = 9h03m.7, Decl. = +50o55' (equinox 1950.0),
the other 12" east and 5" north of the nucleus of an anonymous galaxy
at R.A. = 10h04m.0, Decl. = +68o36' (equinox 1950.0).  The supernovae
were of photographic magnitude 16.5 and 17.0 on Feb. 19 and 20,

     R. Barbon, F. Ciatti and L. Rosino, Asiago Astrophysical
Observatory, telex that plates taken at Asiago on Feb. 17 and 18 show
the supernova in NGC 2268 (IAUC 3667) at B ~ 13.7.  Spectra obtained
by T. Iijima indicate the typical absorption feature of Type
I supernovae at 618 nm and broad bands near 564, 522, 495, 481, 460
and 417 nm corresponding to a date one week after maximum.

     N. Panagia, G. Palumbo, F. Machetto, W. Wamsteker and J. C.
Blades, European Space Agency, Villafranca, report observations of
the NGC 2268 supernova with the IUE satellite.  Two low-resolution
spectra obtained in the long-wavelength region on Feb. 18.43 UT
show a steep decrease in flux toward the ultraviolet, extending to
~ 260 nm.  Some broad features appear to be present.  The spectrum
is very similar to those obtained for supernovae 1980L and 1981B
(IAUC 3584), indicating a Type I supernova.  The FeS magnitude (520
nm) at the time of observation was 13.4.  The positional information
from the FeS image was used to determine the position of the
supernova as R.A. = 7h01m07s, Decl. = +84o28'05" (+/-4", equinox 1950.0).

     G. K. Skinner, University of Birmingham; D. Leahy, R. F.
Elsner and M. C. Weisskopf, NASA Marshall Space Flight Center; and
J. E. Grindlay, Center for Astrophysics, report the discovery of
periodic pulsations in the x-ray emission from the transient
optical and x-ray source A0538-66.  The observations were obtained
with the monitor proportional counter aboard the HEAO-2 (Einstein)
Observatory beginning 1980 Dec. 16.980 UT, when the x-ray source was
in outburst.  The observation lasted 3900 s, and the pulsing was
detected throughout.  The pulse period of 0.069212 s makes this the
fastest detected pulsing x-ray source in a binary system.

1982 February 23               (3671)              Brian G. Marsden

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