The group ID (GID) is set to a group of user accounts on the Linux system. If you want to share data in your research group, you can set the common group ID (GID) as the group ownership. An application form of the group ID is on https://www.adc.nao.ac.jp/MDAS/appl/gid_e.html. Note that only users who have the MDAS account can apply for the group ID.
3.3 Application of the Group ID service