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IAUC 7243: N Cir 1999; SAX J1712.6-3739; 26P

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                                                  Circular No. 7243
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)


NOVA CIRCINI 1999
     C. Jacques and L. Duczmal, Centro de Estudos Astronomicos de
Minas Gerais, report the following CCD position obtained on Aug.
25.0529 UT with a 0.30-m Schmidt-Cassegrain telescope:  R.A. =
14h23m23s.46, Decl. = -69o08'45".3 (equinox 2000.0; uncertainty +/-
0".4, using 39 stars from the Guide Star Catalogue 1.1).  The star
was at V = 7.64 (comparision star SAO 252717).  G. J. Garradd,
Loomberah, New South Wales, Australia, reports the following
position end figures for N Cir 1999 from a CCD image taken on Aug.
25.3692 with a 0.45-m f/5.4 reflector, when the unfiltered
magnitude was determined to be 7.4:  23s.453, 45".31 (five ACT
stars; rms residuals 0".08).


SAX J1712.6-3739
     J. in 't Zand and J. Heise, Space Research Organization
Netherlands (SRON), Utrecht; A. Bazzano and M. Cocchi, Istituto di
Astrofisica Spaziale, CNR, Rome; and M. J. S. Smith, BeppoSAX
Science Operation Center, Rome, and SRON, communicate:  "During an
observation with Wide Field Camera 2 on BeppoSAX on Aug. 24.2-25.5
UT, an x-ray transient was detected at R.A. = 17h12m34s, Decl. =
-37o38'.6 (equinox 2000.0; 99-percent confidence error radius 3').
The flux decreased from 32 to 20 mCrab (2-9 keV).  No x-ray bursts
were detected.  We designate the source SAX J1712.6-3739.  The
centroid is 0'.6 from the ROSAT all-sky survey source 1RXS
J171237.1-373834, which had a flux of 1.6 mCrab (0.1-2.4 keV)
during the survey."


COMET 26P/GRIGG-SKJELLERUP
     S. M. P. McKenna-Lawlor, National University of Ireland at
Maynooth, reports the detection of a possible secondary component
of comet 26P from energetic-particle (about 60-100 keV)
observations by the EPONA instrument aboard the Giotto spacecraft
on 1992 July 10.  The possible secondary component was located 9 x
10**4 km (corresponding to a delay of 40 min along the comet's
orbit) from the primary nucleus and appeared to have had a diameter
3-4 times smaller.  For further details see McKenna-Lawlor and
Afonin (1999, Planet. Space Sci. 47, 557).

                      (C) Copyright 1999 CBAT
1999 August 25                 (7243)            Daniel W. E. Green

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