[vsnet-campaign-xray 183] XTE J1720-318 likely infrared counterpart

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

XTE J1720-318 likely infrared counterpart

Dear Colleagues,

   Daisuke Kato-san, Nagoya University, has just submitted the following
article to IAUC.  The referred URL is already accesible.  A reference page
on VSNET will be coming soon.

Rehards,
Taichi Kato

===

D. Kato, T. Nagata (Nagoya U.) on behalf of the IRSF/SIRIUS team
(Nagoya U., NAOJ), T. Kato, M. Uemura (Kyoto U), and H. Yamaoka (Kyushu U.)
report:
"We performed near-infrared (J, H, Ks) imaging of the field of the X-ray
transient XTE J1720-318 (IAUC 8050) with the Simultaneous three-color
InfraRed Imager for Unbiased Survey (SIRIUS) on the Nagoya-SAAO 1.4m
(IRSF) telescope at Sutherland, South Africa on 2003 Jan. 18.1 and 19.1 UT.
We detected a likely infrared counterpart at 17h 19m 59s.00, -31o 45' 01".2
(J2000.0, about 150 2MASS position reference stars, error 0".2), located
within 1".7 of the proposed radio counterpart (IAUC 8054).
The new object is invisible on public 2MASS images, although definite
identification would require further follow-up observations since the
brightness of the new object is close to the limiting magnitudes of
the 2MASS survey.  The J, H, Ks magnitudes of the object are
16.73 +/- 0.02, 15.91 +/- 0.03, 15.31 +/- 0.03 (Jan. 18.1) and
16.68 +/- 0.02, 15.80 +/- 0.03, 15.27 +/- 0.05 (Jan. 19.1).
The finding chart is available at
http://www.z.phys.nagoya-u.ac.jp/~kato/irsf3.gif ".

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