IAUC 7263: SAX J1719.6-4254, MXB 1658-298, and SAX J1819.3-2525; RW UMi; DD Cir; 1999dn The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site). ------------------------------------------------------------------------ Read IAUC 7262 [ SEARCH ] Read IAUC 7264 View IAUC 7263 in .dvi or .ps format. IAUC number ------------------------------------------------------------------------ Circular No. 7263 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 ISSN 0081-0304 Phone 617-495-7244/7440/7444 (for emergency use only) SAX J1719.6-4254, MXB 1658-298, and SAX J1819.3-2525 J. Heise, Space Research Organization Netherlands, Utrecht; L. Natalucci and M. Cocchi, Istituto di Astrofisica Spaziale, CNR, Rome; and M. Smith, G. Tassone, G. Celidonio, and L. Di Ciolo, BeppoSAX Science Operations Center, Rome, communicate: "During an observation with Wide Field Camera 2 (WFC2) on BeppoSAX between Sept. 22.04 and 23.45 UT, a new faint x-ray transient was detected with a maximum flux of 23 mCrab (2-9 keV). The source, designated SAX J1719.6-4254, is located at R.A. = 17h19m38s, Decl. = -42o53'.8 (equinox 2000.0), with a radius of the 99-percent-confidence error circle of 2'.1 The nearest SIMBAD source is a K2 star (V = 9.41) located 3'.3 away. In the same field-of-view of the WFC, MXB 1658-298 is visible at a flux level of about 30 mCrab; the persistent emission of this source was not detected previously with the WFCs, but recently an x-ray burst was seen on Sept. 2.10. SAX J1819.3-2525 (GM Sgr; cf. IAUC 7253) was not detected above a (5-sigma) upper limit of 8 mCrab. A follow-up observation on SAX J1719.6-4254 with the BeppoSAX Narrow Field Instruments is being scheduled." RW URSAE MINORIS A. Retter, Keele University, reports that CCD photometry of the classical nova RW UMi (cf. IAUC 4672) during 14 nights in 1997, with the 1-m Wise telescope through a 'clear' filter, yields periodic modulations in the light curve with a peak-to-trough amplitude of 0.03 mag and period 0.0591 +/- 0.0003 day. DD CIRCINI Visual magnitude estimates communicated via H. C. Vital, Rio de Janeiro, Brazil: Sept. 6.006 UT, 10.4 (E. Salazar, Cusco, Peru); 8.000, 10.6 (Salazar); 9.097, 10.8 (J. Garcia, Rama Caida, Argentina); 10.993, 10.9 (A. Alves, Florianopolis, Brazil); 14.194, 11.3 (Garcia); 15.937, 11.4 (Alves); 16.958, 11.5 (Alves); 18.951, 11.6 (Vital); 20.014, 11.8 (Garcia). SUPERNOVA 1999dn IN NGC 7714 Unfiltered CCD magnitudes: Sept. 4.666 UT, 15.7 (S. Yoshida and K. Kadota, Ageo, Saitama, Japan); 11.010, 16.3 (E. Prosperi, Larciano, Italy). (C) Copyright 1999 CBAT 1999 September 23 (7263) Daniel W. E. Green ------------------------------------------------------------------------ Read IAUC 7262 [ SEARCH ] Read IAUC 7264 View IAUC 7263 in .dvi or .ps format. ------------------------------------------------------------------------ Our Web policy. Index to the CBAT/MPC/ICQ pages. CBAT