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IAUC 7263: SAX J1719.6-4254, MXB 1658-298, and SAX J1819.3-2525; RW UMi; DD Cir; 1999dn

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                                                  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

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