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IAUC 6543: 1997T; XTE J1709-267

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                                                 Circular No. 6543
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)

     J. Mueller reports her discovery of an apparent supernova (mag
about 17.5) on a plate taken on Jan. 19 with the 1.2-m Oschin
Schmidt telescope in the course of the second Palomar Sky Survey.
Mueller reports the following approximate position for the
supernova:  R.A. = 11h55m48s.8, Decl. = +80o12'44" (equinox 2000.0);
this is 9" east and 29" south of the southern bright component of
this three-galaxy complex.
     S. Nakano, Sumoto, Japan, reports the following precise
position for SN 1997T, measured by Y. Kushida from an unfiltered
CCD frame taken on Jan. 22.619 UT by R. Kushida (Yatsugatake South
Base Observatory, 0.40-m reflector):  R.A. = 11h55m47s.46, Decl. =
+80o12'42".6 (equinox 2000.0), mag 17.6; this corresponds to 9".5
east and 27".3 south of the brightest galaxy component.

XTE J1709-267
     F. E. Marshall, Laboratory for High Energy Astrophysics,
Goddard Space Flight Center (LHEA/GSFC); J. H. Swank, LHEA/GSFC; B.
Thomas, Hughes STX and LHEA/GSFC; L. Angelini, Universities Space
Research Association (USRA) and LHEA/GSFC; A. Valinia, National
Research Council and LHEA/GSFC; and K. Ebisawa, USRA and LHEA/GSFC,
report the discovery of an x-ray nova with the Proportional Counter
Array (PCA) onboard the Rossi X-ray Timing Explorer (RXTE).  The
source was first seen for about 20 s on Jan. 16.016 UT during a
satellite maneuver and seen again during a second maneuver on Jan.
18.147.  The best-fit position for the source is R.A. = 17h09m.3,
Decl. = -26o44' (equinox 2000.0; estimated systematic uncertainty
about 6').  During both observations, the 2-10-keV source intensity
was about 0.14 times that of the Crab.  There is no catalogued hard
x-ray source near this position, but the source may be associated
with the ROSAT All-Sky Survey (IAUC 6420) source 1RXS
J170930.2-263927, which is 5' from the best-fit RXTE position.  The
ROSAT source was 13 mCrab in the band 1-2.4 keV.  Column densities
of spectral fits to the PCA slew data depend on the model; a power
law has a photon index of 3.06 +/- 0.06 and absorption by a column
density of (5.8 +/- 0.6) x 10E22 cmE-2, while a bremsstrahlung
model has kT = 4.7 +/- 0.2 keV and half the column density.
Additional observations are encouraged, to determine an accurate
position of the new source, test the possible association with
J170930.2-263927, and determine other properties."

                      (C) Copyright 1997 CBAT
1997 January 24                (6543)            Daniel W. E. Green

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