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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
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)

     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."

     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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