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IAUC 5615: N IN NGC 1313?

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                                                  Circular No. 5615
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)


NOVA IN NGC 1313?
     S. D. Ryder and M. A. Dopita, Mount Stromlo and Siding Spring
Observatories (MSSSO); L. Staveley-Smith, Australia Telescope
National Facility, CSIRO; D. Malin, Anglo-Australian Observatory; E.
Colbert, University of Maryland; R. Petre and E. Schlegel, Goddard
Space Flight Center; and D. Campbell-Wilson, University of Sydney,
report:  "The suspected nova in NGC 1313 (IAUC 4950) is possibly a
supernova with characteristics similar to SN 1961V and SN 1986J
(type IIpec or V).  Archival plates reveal that an outburst occurred
in mid-1978, the brightest known image being that in Fig. 3
of Marcelin and Athanassoula (1982, A.Ap. 105, 76); the nova/
supernova candidate is 15 mm to the left and 8 mm up from the lower
right corner of this reproduced plate, or about 218" west and 193"
south of the optical center of the galaxy quoted in the ESO/Uppsala
Atlas.  Approximate magnitudes, from U.K. Schmidt Telescope plates
unless noted otherwise (SB = Sandage and Bedke 1988, Atlas of
Galaxies, NASA SP-495; ES = ESO Schmidt plate; S = CCD photometry by
Ryder using the MSSSO 1.0-m and 2.3-m telescopes):  1973 Oct. 1 and
Nov. 24, B > 22 (ES); 1974 Sept. 16, 18, Oct. 12, 1975 Jan. 11,
Oct. 3, 28, and Nov. 29, BJ = 22.1; 1976 Dec. 14, R = 20.0; 1977
Oct. 12, BJ > 22.1; 1978 July 31, B = 16.0 (Marcelin and
Athanassoula; see above); Sept. 26, B = 17.9 (SB; panel 51); Oct.
4, V = 17.7 (SB; panel 7); Nov. 24, BJ = 19.0; 1981 Oct. 7, BJ =
22.1; 1982 Nov. 14, BJ > 22.1; 1984 Sept. 27, R = 20.0 (ES); 1986
Oct. 23, R = 18.4 (ES); Nov. 22, BJ = 21.7; 1987 Oct. 26, R = 18.4;
Oct. 27, BJ = 21.6; Nov. 25 and Dec. 24, I > 20.0; 1988 Jan. 11, R
= 18.4; Dec. 14, U > 21.0, B > 20.7; 1989 Nov. 22, R = 18.1; Dec.
29, V = 20.0 (S); 1990 Oct. 24, R = 18.0; 1992 Jan. 5, V = 20.30,
R = 18.70, B = 20.90 (S).  Observations in 1992 July with the
Australia Telescope Compact Array show a strong non-thermal radio
source (147 mJy at 1.4 GHz) located at R.A. = 3h17m02s.4, Decl. =
-66 43'57" (equinox 1950.0), within 1" of the optical position.
Observations of NGC 1313 at 843 MHz with the Molonglo Observatory
Synthesis Telescope in 1982 January (Harnett 1987, MNRAS, 227,
887), 1986 January, and 1992 July give respective flux densities of
90, 224, and 157 mJy, consistent with a powerful radio supernova in
a dense circumstellar environment.  ROSAT observations in 1991 April
and May reveal an extremely powerful x-ray source with an unabsorbed
flux of 3.4 x 10E-12 erg sE-1 cmE-2 at the same position.
This source was not present in an Einstein image taken in 1980
January, again consistent with a supernova outburst in 1978."


1992 September 22              (5615)            Daniel W. E. Green

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