Fig. 3
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Selection of extragalactic transients from variability sample. Firstly, we assign NWAY LS10 optical counterparts: 1526 have a counterpart within 15″ and 87 are not associated with an NWAY/LS10 optical source or do not have a reliable counterpart. Then we apply numerous cuts to exclude contaminating clusters, stars and known preeROSITA AGN. The final catalog of Extragalactic X-ray transients (eRO-ExTra) includes 304 sources (93% with a reliable counterpart).
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