GRANDMA is a network of ground facilities dedicated to time domain astronomy. It will be operational during the electromagnetic follow-up of gravitational waves candidates during the next LIGO/Virgo observational campaign (O3). GrandMa is composed of telescopes (mostly robotics) spread all over the world with photometric and spectrometric capabilities. KILONOVA CATCHER : The GRANDMA citizen science project on gravitational wave astronomy (Supported by Universite de Paris) : https://grandma-kilonovacatcher.lal.in2p3.fr/ To contact us, please send a message to antier@apc.in2p3.fr