The Nicolaus Copernicus Astronomical Center (NCAC) in Warsaw, informs that in the competition for the post-doc position, (announced on April 11th, 2022), financed by the project OPUS 21, nr 2021/41/B/ST9/01191, led by prof. Mirek Giersz, the jury recommended and the Scientific Council approved employment of dr Grzegorz Wiktorowicz.