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| I | II | III | IV | |
| Known INSs | 16 | 0 | 1 | 1 |
| INS candidates | 1 | 5 | 24 | 2 |
| Solar system objects | 2 | 0 | 0 | 0 |
| Extragalactic X-ray sources | 12 | 31 | 39 | 6 |
| Bright knots in SNRs | 9 | 59 | 18 | 51 |
| Diffuse emission in clusters of galaxies | 2 | 6 | 9 | 0 |
| Spurious out-of-time events / edge | 10 | 70 | 58 | 8 |
| Spurious in wing of bright object | 2 | 15 | 18 | 6 |
| Sources in CCD gap | 3 | 13 | 46 | 5 |
| Other | 2 | 3 | 8 | 0 |
| Total | 59 | 202 | 221 | 79 |
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