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Table A.2
Summary of proposed variability mechanism.
| XMMSL1 name | Type | z | Variability causes and comments |
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| Sources displaying factor >10 variability between ROSAT and XMM, and XMM and Swift epochs | |||
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| J015510.9-140028 | – | – | spurious slew detection |
| J024916.6-041244 | Sy 1.9 | 0.0186 | soft, absorbed black body spectrum; variability likely intrinsic in nature due to constant spectral shape |
| J034555.1-355959 | – | – | inconclusive |
| J045740.0-503053 | – | – | inconclusive |
| J051935.5-323928 | Sy 1.5 | 0.0125 | other studies suggest variable absorption |
| J070841.3-493305 | NLS 1 | 0.0406 | intrinsic power law changes; studies suggest variable reflection off disc |
| J111527.3+180638 | liner | 0.00278 | tidal disruption event |
| J113001.8+020007 | – | – | spurious slew detection |
| J132342.3+482701 | non-active | 0.0875 | tidal disruption event |
| J193439.3+490922 | – | – | unclear; only detected during three XMM slews |
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| Sources displaying factor >10 variability between ROSAT and XMM epochs | |||
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| J005953.1+314934 | Sy 1.2 | 0.0149 | neutral and ionised partially covering absorbers |
| J020303.1-074154 | Sy 1 | 0.0615 | spectral shape unaltered since 2004 indicating intrinsic flux change; little variability since 2006 |
| J044347.0+285822 | Sy 1 | 0.0217 | neutral partial covering absorbers |
| J064541.1-590851 | – | – | inconclusive; no evidence for significant variability since 2006; bright state spectra do not require absorption |
| J082753.7+521800 | QSO, RL | 0.3378 | no absorption required in bright state, likely jet variability |
| J090421.2+170927 | QSO | 0.0733 | possibly ionised absorption |
| J093922.5+370945 | NLS 1 | 0.1861 | inconclusive; bright state spectra do not require absorption |
| J100534.8+392856 | Sy 1 | 0.1409 | bright state spectrum does not require absorption; possibly increased intrinsic emission. |
| J104745.6-375932 | Sy 1 | 0.0755 | absorption-only excluded; faintest state does not require absorption |
| J112841.5+575017 | Sy 2 | 0.0509 | inconclusive; brightest state does not require absorption |
| J121335.0+325609 | QSO | 0.222 | inconclusive |
| J162553.4+562735 | QSO | 0.307 | soft spectrum; absorption-only excluded |
| J173739.3-595625 | Sy 2 | 0.0170 | intrinsic; constant spectral shape from 2008–2013 |
| J183521.4+611942 | blazar, RL | 2.274 | inconclusive; likely jet contribution |
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