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The discovery of gravitational wave (GW) events and the detection ofelectromagnetic counterparts from GW170817 has started the era ofmultimessenger GW astronomy.The field has been developing rapidly and in thispaper,we discuss the preparation for detecting these events with the ESA Gaiasatellite,during the 4th observing run of the LIGO-Virgo-KAGRA (LVK)collaboration that has started on May 24,2023. Gaia is contributing to thesearch for GW counterparts by a new transient detection pipeline called GaiaX.In GaiaX, a new source appearing in the field of view of only one of the twotelescopes on-board Gaia is sufficient to send out an alert on the possibledetection of a new transient. Ahead of O4, an experiment was conducted over aperiod of about two months. During the two weeks around New Moon in this periodof time, the MeerLICHT (ML) telescope located in South Africa tried (weatherpermitting) to observe the same region of the sky as Gaia within 10 minutes.Any GaiaX detected transient was published publicly. ML and Gaia have similarlimiting magnitudes for typical seeing conditions at ML. At the end of theexperiment, we had 11861 GaiaX candidate transients and 15806 ML candidatetransients, which we further analysed and the results of which are presented inthis paper. Finally, we discuss the possibility and capabilities of Gaiacontributing to the search for electromagnetic counterparts of gravitationalwave events during O4 through the GaiaX detection and alert procedure.

Preparing for Gaia Searches for Optical Counterparts of Gravitational Wave Events during O4