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Table 2
Overview of diagnostic flags included in the transient candidate catalogue.
| Flag Name | Type | Description | Count |
| non_unique | Boolean | True if the transient is matched with a source detected at low significance in other Chandra observations (sources detected at > 3σ in more than one observation are already excluded). | 58 |
| snr_match | Boolean | True if the source is associated with a known Galactic SNR (e.g. Cas A, Tycho), based on observation ID cross-matching. | 5 |
| extended_fov | Boolean | True if the source lies in or near an extended Galactic structure identified by manual inspection of the FOV. | 13 |
| readout_streak | Boolean | True if the source overlaps with a known instrumental readout streak, commonly from bright sources like Cyg X–1. | 29 |
| edge_affected | Boolean | True if the source region (as determined by wavdetect) is not fully covered due to detector dithering; computed via dither_region. | 392 |
| bkg_correlated | Boolean | True if the Pearson correlation between the source and background light curves during the T90 interval exceeds 0.15, indicating likely background flaring. | 49 |
| start_or_end | Boolean | True if the T5 or T95 time falls within the first or last 5% of the observation, indicating the event may lie at the edge of the observing window. | 266 |
Notes. These flags helped us to identify likely artefacts or ambiguous cases that may not represent genuine transient events. Out of a total of 1420 candidates, 765 form a golden sample with none of the listed flags set to true.
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