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Circular No. 6925 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html Phone 617-495-7244/7440/7444 (for emergency use only) SUPERNOVA 1998ck IN ESO 434-G20 J. Maza, Department of Astronomy, University of Chile, reports the discovery by Marina Wischnjewsky, on a T-Max 400 film taken by L. E. Gonzalez with the Maksutov telescope at Cerro El Roble on May 31.969 UT, of an apparent supernova (B about 17) located at R.A. = 9h41m06s.00, Decl. = -29o06'17".7 (equinox 2000.0), which is 7" west and 1" south of the center of the spiral galaxy ESO 434-G20. The star was confirmed on direct CCD images obtained by I. Perez on June 1 using the 1.0-m telescope at Las Campanas Observatory, but it was not present on a film obtained on May 19.1 (B > 20). SUPERNOVA 1998cg IN ANONYMOUS GALAXY F. Patat, European Southern Observatory (ESO); and M. Turatto, Osservatorio Astronomico di Padova, observed SN 1998cg with the ESO 3.6-m telescope (+ EFOSC2; range 330-750 nm, resolution 1.8 nm) on May 30.07 UT at La Silla. The reduced spectrum shows that this object is indeed a supernova. The spectral features are consistent with a type-Ia classification, about 1 month after maximum light (cf. Patat et al. 1996, MNRAS 278, 111). The spectrum is dominated by several emission lines with the usual P-Cyg profiles, superimposed on a red continuum. Most of the lines arise from Si II, S II, Fe II, and Fe III. The redshift of the parent galaxy, estimated from the H-alpha line, is 0.119, which confirms that the parent galaxy is a foreground object with respect to the cluster Abell 1514. W COMAE BERENICES G. Tagliaferri and G. Ghisellini, Osservatorio Astronomico di Brera, Milan; and P. Giommi, BeppoSAX, Rome, on behalf of the BeppoSAX ToO collaboration on blazars, report: "This BL Lac object (= ON 231) was observed with the BeppoSAX Narrow Field Instruments on May 11.96-12.90 UT. The source was bright, with variability by a factor of about 3 detected only below 2 keV. The source was well visible in the Phoswich Detector System up to about 100 keV. The preliminary analysis indicates an average energy flux of 2.6 x 10E-11 erg cmE-2 sE-1 in the band 0.1-4 keV. Above 4 keV, the spectrum hardens dramatically, with a 4-100-keV flux of about 4 x 10E-11 erg cmE-2 sE-1. The extremely flat high-energy spectrum suggests a very high gamma-ray flux. Continuing observations at all wavelengths are urged." (C) Copyright 1998 CBAT 1998 June 2 (6925) Daniel W. E. Green
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