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IAUC 7397: 2000bh; XTE J1118+480; 2000E

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IAUC number

                                                  Circular No. 7397
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 2000bh IN ESO 573-14
     J. Maza, University of Chile; and M. Hamuy, University of
Arizona, report the discovery by R. Antezana, on a 30-min
unfiltered T-Max 400 film taken by L. Gonzalez on Apr. 5.23 UT with
the University of Chile's Maksutov telescope, of a supernova (m_pv
about 16.0) located at R.A. = 12h21m15s.14, Decl. = -21o59'55".7
(equinox 2000.0), which is about 8" west and 11" south of the
nucleus of the host galaxy (ESO 573-14, z = 0.023).  The supernova
was confirmed by M. M. Phillips (Carnegie Institution of
Washington) from J and H images taken with the Las Campanas 1.02-m
Swope telescope on Apr. 6, and by T. B. Williams (Rutgers
University) from BVRI images taken with the Cerro Tololo
Interamerican Observatory 0.9-m telescope on Apr. 7.22.  Using the
2.54-m DuPont telescope at Las Campanas Observatory on Apr. 7,
L. C. Ho (Carnegie Institution of Washington) obtained a spectrum
(range 320-900 nm) that reveals SN 2000bh to be a type-Ia event
near maximum light.

XTE J1118+480
     L. Cook, Concord, CA; J. Patterson, Columbia University; D.
Buczynski, Condor Brow Observatory; and R. Fried, Braeside
Observatory, report for the Center for Backyard Astrophysics (cf.
Patterson 1998, Sky Tel. 96(4), 77) that a 5-night V-band light
curve of the optical counterpart (IAUC 7390) shows a regular
periodic variation with a period of 0.1706(9) day and a full
amplitude of 0.061(5) mag.  The signal is smooth and sinusoidal,
suggesting an x-ray heating effect in a close binary with an
orbital period of 0.1706 day.
     Visual magnitude estimates:  Mar. 31.844 UT, 13.0 (P. Schmeer,
Bischmisheim, Germany); Apr. 2.123, 12.9 (Schmeer); 2.902, 12.9
(Schmeer); 4.010, 13.0 (Schmeer); 6.838, 12.7 (K. Hornoch,
Lelekovice, Czech Rep.).

     CCD magnitudes, unfiltered unless otherwise noted: Jan. 28.740
UT, R = 14.2 +/- 0.1 (L. Kiss, K. Sarneczky, and K. Sziladi,
Piszkesteto station, Konkoly Observatory); 28.816, 14.3 (S. Yoshida
and K. Kadota, Ageo, Saitama, Japan); Mar. 16.11, 16.0 +/- 0.1
(Sarneczky, Sziladi, and Kiss); 29.024, 15.8 (Hornoch); Apr. 3.028,
16.0 (Hornoch).

                      (C) Copyright 2000 CBAT
2000 April 8                   (7397)            Daniel W. E. Green

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