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Table 1
Cross-matching radii of the X-ray catalogues.
| Catalogue | Error position | Cross-matched |
| radius | ||
|
|
||
| RASS | 0–36 arcsec | 0.6 arcmin |
| >37 arcsec | 0.8 arcmin | |
| Swift 1SWXRT | 0–5 arcsec | 0.1arcmin |
| >5 arcsec | 0.2 arcmin | |
| Swift deep XRT GRB | all data | 0.2 arcmin |
| 3XMM DR4 | 0−5 arcsec | 0.1 arcmin |
| >5 arcsec | 0.2 arcmin | |
| XMM Slew DR6 | all data | 10 arcsec |
| Einstein IPC | all data | 40 arcsec |
| IPC Slew | all data | 1.2 arcmin |
| WGACAT2 | all data | 50 arcsec |
| Chandra | all data | 0.1 arcmin |
| BMW | all data | 0.15 arcmin |
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