We present the design, methods, and first results of the MUSE Analysis of Gas around Galaxies (MAGG) survey, a large programme on the Multi-Unit Spectroscopic Explorer (MUSE) instrument at the Very Large Telescope (VLT), which targets 28z>3.2 quasars to investigate the connection between optically thick gas and galaxies at z~3-4. MAGG maps the environment of 52 strong absorption line systems at z>~3, providing the first statistical sample of galaxies associated with gas-rich structures in the early Universe. In this paper, we study the galaxy population around a very metal poor gas cloud at z~3.53 towards the quasar J124957.23-015928.8. We detect three Ly{alpha} emitters within ~<200km/s of the cloud redshift, at projected separations ~2 and m_r_<27mag)

Cone search capability for table J/MNRAS/491/2057/table4 (Line emitters extracted within 1000km/s of the LLS at z~3.525)