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The Gaia catalogue of nearby stars (GCNS) divided all objects with parallaxes$>$10mas into GCNS-selected and GCNS-rejected 100pc samples. Below the whitedwarf (WD) sequence in the complete GCNS color-magnitude diagram (CMD), at$Gabs>14.7+4.7(G-RP)$, there appear 60 GCNS-selected faint blue white dwarfs(FBWDs). However this CMD region is also populated by 411 GCNS-rejectedobjects, mainly from crowded regions towards the Galactic centre and theMagellanic Clouds. The WD catalog of Gentile Fusillo et al. (2021) lists only47 GCNS-selected but also 8 GCNS-rejected objects. I confirm 59 of theGCNS-selected but none of the GCNS-rejected objects as FBWDs from visualinspection and a proper motion check using additional optical sky surveys.Hence FBWDs form an additional branch in the CMD. Compared to the fullGCNS-selected 100pc sample, FBWDs have relatively high proper motions andtangential velocities. They represent interesting targets for studies ofultracool or infrared-faint, and possibly also ultramassive WDs.

Astrometric and photometric verification of faint blue white dwarfs in the Gaia catalogue of nearby stars