\begin{table}  %t2
\caption{\label{table:coord}Equatorial coordinates and position uncertainties of the sources discussed in the text.}
\small%\centering
\par
\begin{tabular}{lllll}
\hline \hline
Source    & {$\alpha_{\rm (J2000.0~ICRS)}$} & {$\delta_{\rm (J2000.0~ICRS)}$} & Pos. uncertainty & Astrometry \\
\hline\noalign{\smallskip}
\object{IGR~J18027$-$1455}         & 18$^{\rm h}$02$^{\rm m}$46$\fs$0    & $-$14$\degr$54$\arcmin$10$\farcs$0    & 2$\arcmin$  (90\% or 1.6$\sigma$) & 1st IBIS/ISGRI \citep{bird04} 
\\
\object{NVSS~J180247$-$145451}     & 18$^{\rm h}$02$^{\rm m}$47$\fs$375  & $-$14$\degr$54$\arcmin$54$\farcs$78   & 0\farcs02 (68\% or 1$\sigma$)   & this work 
\\
\object{2MASS~J18024737$-$1454547} & 18$^{\rm h}$02$^{\rm m}$47$\fs$370  & $-$14$\degr$54$\arcmin$54$\farcs$76   & 0\farcs03 (68\% or 1$\sigma$)   & 2MASS \citep{cutri03} 
\\
\object{USNO-B1.0~0750-0506536}    & 18$^{\rm h}$02$^{\rm m}$47$\fs$38   & $-$14$\degr$54$\arcmin$55$\farcs$1    &  0\farcs2  (68\% or 1$\sigma$)  & USNO-B1.0 \citep{monet03} 
\\
\object{1RXS~J180245.5$-$145432}   & 18$^{\rm h}$02$^{\rm m}$45$\fs$5    & $-$14$\degr$54$\arcmin$32$\farcs$0    & 19\farcs0 (68\% or 1$\sigma$)   & {\it ROSAT} \citep{voges00} \\
\hline
\end{tabular}
\end{table}