The GRANDMA network covers all the time zones and both hemispheres. In case of LIGO-Virgo alerts, this allows to look immediately after the optical counterpart, if it exists, and to measure the first points of the light curve of a possible kilonova. The network posseses wide-field of view telescopes, like TAROT, narrow-field but more sensitive telescopes and spectroscopic facilities in order to characterize the identified sources.
The collaboration software is hosted at IJCLab within the Virtual Data computing center.