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Circular No. 6898 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 1998bt L. Germany reports that the Mount Stromlo Abell Cluster Supernova Search Team (cf. IAUC 6639, 6893) has discovered an apparent supernova (V = 19.7), presumably associated with the Abell cluster 1736, on V and R CCD images taken on Mar. 10 with the Mount Stromlo 1.27-m telescope (+ Macho Camera). No background host galaxy has been identified for the object, which is located at R.A. = 13h25m41s.93, Decl. = -26o46'55".7 (equinox 2000.0). SN 1998bt is present on images taken on Feb. 23 and Apr. 6, 18, and 30, with limiting V magnitudes of 21.0, 21.0, 21.5, and 21.5, respectively. The object increased in brightness by > 1.5 mag between Feb. 23 and Apr. 6, and has faded by about half a magnitude since then. The star was not present on an image taken on Jan. 27 (limiting mag V = 21.5). SUPERNOVA 1998Z IN ANONYMOUS GALAXY Germany also writes: "I obtained a spectrum (range 380-750 nm) of SN 1998Z (cf. IAUC 6850) with the Mount Stromlo 2.3-m telescope (+ DBS) on Apr. 1. The spectrum confirms this object to be a type-Ia supernova within a week of maximum light." GRB 980425 P. M. Vreeswijk, University of Amsterdam, writes that he provided the wrong position for the optical position of the suspected supernova in ESO 184-G82 on IAUC 6895, lines 7-8; the correct position should read R.A. = 19h35m03s.17, Decl. = -52o50'46".1 (equinox 2000.0). SAX J1808.4-3658 = XTE J1808-369 A. V. Filippenko adds that the spectra reported on IAUC 6897 were obtained on May 2 UT. SUPERNOVA 1998aq IN NGC 3982 CCD V photometry: Apr. 20.904 UT, 12.67 (D. Hanzl, Brno, Czech Republic); 25.911, 12.25 (Hanzl); 26.957, 12.22 (Hanzl); 27.15, 12.14 +/- 0.14 (D. B. Caton, Dark Sky Observatory, Appalachian State University); 28.027, 12.18 (Hanzl); 30.886, 12.20 (Hanzl); May 2.956, 12.23 (Hanzl); 5.947, 12.36 (Hanzl). On Apr. 20.904, Hanzl also reported B-V = +0.02. (C) Copyright 1998 CBAT 1998 May 8 (6898) Daniel W. E. Green
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