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IAUC 6955: 1998cq; XTE J2123-058; N Oph 1998

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                                                 Circular No. 6955
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 1998cq IN ANONYMOUS GALAXY
     L. Germany reports that the Mount Stromlo Abell Cluster
Supernova Search Team (cf. IAUC 6639) has discovered another
apparent supernova (V = 19.3) on V and R CCD images taken on June
17 (limiting mag V = 20.5) by S. Chan at the Mount Stromlo 1.27-m
telescope (+ Macho Camera), and confirmed by Chan on June 18
(limiting mag V = 20.5).  SN 1998cq is located near Abell 2819 at
R.A. = 0h45m06s.11, Decl. = -63o49'50".4 (equinox 2000.0), which is
0".3 east and 1".2 north of the center of its host galaxy.  A
nearby star has position end figures 03s.14, 14".8.  SN 1998cq was
not visible on similar images taken on 1997 Dec. 19 (limiting mag V
= 21.5).  A spectrum (range 400-750 nm) taken by Germany with the
Mount Stromlo 2.3-m telescope (+ DBS) on June 26 is consistent with
a type-Ia supernova at a redshift of 0.15.  Finding charts are
available at http://msowww.anu.edu.au/~reiss/Abell_SNSearch/.


XTE J2123-058
     A. Levine, Massachusetts Institute of Technology (MIT); and J.
Swank and E. Smith, Goddard Space Flight Center (GSFC), NASA,
report on behalf of the RXTE ASM and PCA teams at MIT and GSFC:  "A
transient x-ray source has been detected with the RXTE/ASM at R.A.
= 21h23m.1, Decl. = -5o49' (equinox 2000.0), corresponding to l =
46.4 deg, b = -36.2 deg.  The position uncertainty is about 10'
along an axis with p.a. 20 deg (i.e., northeast-southwest) and
about 5' in the perpendicular direction (90-percent confidence).
The flux was measured to be about 100 mCrab (2-12 keV) in each of
five measurements on June 27-28.  The strength of the source has
been confirmed with PCA observations June 27.95, in which the count
rate varied from 600 to 1000 counts/s.  Additional PCA observations,
including a determination of the source location, will be
undertaken.  The appearance of a new transient x-ray source at high
galactic latitude is unusual; we urge observers to carry out
additional observations at all wavelengths."


NOVA OPHIUCHI 1998
     Additional CCD photometry by D. Hanzl, Brno, Czech Republic
(cf. IAUC 6943):  June 19.887 UT, V = 10.87 +/- 0.02, B-V = +0.75
+/- 0.03; 20.931, 10.86 +/- 0.02, +0.67 +/- 0.03; 21.928, 11.87
+/- 0.01, +0.54 +/- 0.02; 22.878, 12.22 +/- 0.06, +0.54 +/- 0.02;
25.942, 12.92 +/- 0.04, +0.64 +/- 0.1; 27.891, 13.39 +/- 0.07, -.

                      (C) Copyright 1998 CBAT
1998 June 29                   (6955)            Daniel W. E. Green

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