Table 2: Equatorial coordinates and position uncertainties of the sources discussed in the text.
Source $\alpha_{\rm (J2000.0~ICRS)}$ $\delta_{\rm (J2000.0~ICRS)}$ Pos. uncertainty Astrometry

IGR J18027-1455		 18$^{\rm h}$02$^{\rm m}$46$\hbox{$.\!\!^{\rm s}$ }$0 -14$\hbox{$^\circ$ }$54$\hbox{$^\prime$ }$10$\hbox{$.\!\!^{\prime\prime}$ }$0 2$\hbox{$^\prime$ }$ (90% or 1.6$\sigma $) 1st IBIS/ISGRI (Bird et al. 2004)
NVSS J180247-145451 18$^{\rm h}$02$^{\rm m}$47$\hbox{$.\!\!^{\rm s}$ }$375 -14$\hbox{$^\circ$ }$54$\hbox{$^\prime$ }$54$\hbox{$.\!\!^{\prime\prime}$ }$78 0$.\!\!^{\prime\prime}$02 (68% or 1$\sigma $) this work
2MASS J18024737-1454547 18$^{\rm h}$02$^{\rm m}$47$\hbox{$.\!\!^{\rm s}$ }$370 -14$\hbox{$^\circ$ }$54$\hbox{$^\prime$ }$54$\hbox{$.\!\!^{\prime\prime}$ }$76 0$.\!\!^{\prime\prime}$03 (68% or 1$\sigma $) 2MASS (Cutri et al. 2003)
USNO-B1.0 0750-0506536 18$^{\rm h}$02$^{\rm m}$47$\hbox{$.\!\!^{\rm s}$ }$38 -14$\hbox{$^\circ$ }$54$\hbox{$^\prime$ }$55$\hbox{$.\!\!^{\prime\prime}$ }$1 0$.\!\!^{\prime\prime}$2 (68% or 1$\sigma $) USNO-B1.0 (Monet et al. 2003)
1RXS J180245.5-145432 18$^{\rm h}$02$^{\rm m}$45$\hbox{$.\!\!^{\rm s}$ }$5 -14$\hbox{$^\circ$ }$54$\hbox{$^\prime$ }$32$\hbox{$.\!\!^{\prime\prime}$ }$0 19$.\!\!^{\prime\prime}$0 (68% or 1$\sigma $) ROSAT (Voges et al. 2000)


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