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IAUC 3587: SN IN NGC 4536; 3A 0557-383; GK Per

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IAUC number 

                                                  Circular No. 3587
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 617-864-5758


SUPERNOVA IN NGC 4536
     P. M. Williams and W. J. Zealey, U.K. Infrared Telescope, report
that observations made on Mar. 12 and 14 of the supernova in
NGC 4536 gave the following magnitudes: J = 12.97, H = 12.90, K =
12.81. They also provide the following measured positton: R.A. =
12h31m56s.5, Decl. = +2o28'27" (equinox 1950.0).
     P. Salinari, Osservatorlo Astrofisico di Arcetri; and A. F. M.
Moorwood, European Southern Observatory, Garching, telex: "We have
obtained the following magnitudes with the ESO 3.6-m telescope: Mar.
17.229 UT, J = 13.75 +/- 0.05, H = 13.27 +/- 0.05, K = 12.99 +/- 0.05;
22.146, J = 14.57 +/- 0.05, H = 13.44 +/- 0.1, K = 13.34 +/- 0.06.  Noteworthy
is the larger decay in J (Delta-J = +0.82, Delta-H = +0.17, Delta-K = +0.35)
     P. Collins, Cambridge, MA, reports mv = 12.0 on Mar. 15.281 UT.


3A 0557-383
     I. McHardy and J. Pye, X-Ray Astronomy Group, Leicester University;
and T. Fairall, University of Cape Town, telex: "Spectroscopic
image-photon-counting system observations by Fairall at the
South African Astronomical Observatory have revealed a classic type-I
Seyfert galaxy with extremely strong and broad (full width at
zero intensity -5600 km/s) Balmer lines in the error box of the irregular
x-ray source 3A 0557-383.  The galaxy, a 14.5-magnitude
spiral at position  R.A. = 5h56m21s.2, Decl. = -38o20'15" (uncertainty +/-
1".5, equinox 1950.0), is considered a good identification for the x-ray
source.  It has a red-shift of 0.0344, implying Lx = 10**37.2 J/s
(2-10 keV) and Mv = -22.0."


GK PERSEI
     J. Mattei, American Association of Variable Star Observers, reports
that this nova has continued to rise (cf. IAUC 3574), as indicated
by the following visual magnitude estimates: Feb. 27.3 UT,
11.5 (S. Sharpe, Waterloo, ON); Mar. 2.1, 11.2 (R. Adams, Florence,
MA); 12.9, 11.2 (K. Medway, Hampshire, Eng.); 14.1, 10.2 (Adams);
15.1, 10.5 (E. Mayer, Jr., Barberton, OH); 16.1, 10.2 (Adams); 17.1,
10.6 (E. Mayer, Barberton, OH); 23.1, 10.4 (Adams).
     T. Urata, Nihondaira Observatory, telexes the following additional
estimates: Feb. 17.41 UT, 11.9 (K. Hirosawa, Inazawa, Aichi);
18.41, 12.0 (S. Fujino, Hamamatsu).


1981 March 25                  (3587)              Daniel W. E. Green

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