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IAUC 3936: 4U 1630-47; SN IN NGC 3169; SN IN NGC 4419; 1983o

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IAUC number 

                                                  Circular No. 3936
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


4U 1630-47
     Y. Tanaka and the Tenma Team report: " A transient x-ray
source, located at R.A. = 16h30m2 +/- 0m2, Decl. = -47deg16' +/- 2'
(equinox 1950.0), was discovered from the x-ray satellite Tenma on
Apr. 1.  The location is consistent with that of 4U 1630-47 (Reid et al.
1980, A.J. 85, 1062; Bradt and McClintock 1983, Ann. Rev. A. Ap.
21, 13), which has not been identified in optical and radio
observations.  The source was half as bright as the Crab and had a
soft spectrum (free-free kT ~ 3.5 keV) in the energy range 2-10
keV on Apr. 7.  Optical and radio observations are urged."


SUPERNOVA IN NGC 3169
     H. Kosai, Tokyo Observatory, provides the following precise
position, measured by him from Okazaki's discovery film (taken on
Mar. 26.59 UT): R.A. = 10h11m35s39, Decl. = +3deg43'07"7 (equinox 1950.0).
R. W. Argyle, Royal Greenwich Observatory, communicates a precise
position from an exposure on Apr. 3.90 UT: end figures 35s35, 07"6;,
offset 60" west, 15" north, mpg = 14.0.

     C. M. Gaskell, McDonald Observatory, University of Texas,
reports: "CCD spectra taken of the supernova between Mar. 30 and
Apr. 2 show very strong, narrow H-alpha emission.  The FWHM is only 360
km/s, and the narrow-line Balmer decrement is very steep.  The
narrow emission line is superimposed on normal broad HS emission.
The narrow-line redshift is 1240 km/s.  The spectrum is otherwise
typical of type-II supernovae at maximum light.  Spectroscopic
monitoring during the next two months would be invaluable."

     Visual magnitude estimates: Mar. 30.12 UT, 15.2 (J. Bryan,
Austin, TX); Apr. 2.12, 14.5 (C. Scovil, Stamford, CT).


SUPERNOVA IN NGC 4419
     Visual magnitude estimates by M. Verdenet, Bourbon-Lancy,
France: Feb. 5.90 UT, 13.4; 10.17, 13.2; 13.20, 13.6; 15.20, 13.7;
23.9, 15.0:; Mar. 4.9, 15.3:; 5.9, 15.3:; 7.9, 15.2:; 25.9, 16.2.


COMET IRAS (1983o)
     Total visual magnitude estimate by C. S. Morris (Angeles
Crest Highway, CA, 0.25-m reflector): Mar. 11.52 UT, 12.8.


1984 April 9                   (3936)              Brian G. Marsden

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