  MAXI J1820+070 is a new low-mass microquasar hosting a black hole recently
discovered in X-rays by the MAXI instrument. It is the counterpart of
ASASSN-18ey, discovered in optical a few days before by ASAS-SN. This source
underwent a major outburst in 2018, during which it completed the typical
"q-shaped" path in the hardness-intensity diagram. MAGIC, VERITAS and H.E.S.S.
gamma-ray telescopes observed the sky position of MAXI J1820+070 for a total of
more than 90 hours in 2018. In addition, some observations were carried out
using MAGIC Central Pixel - a dedicated central pixel capable of detecting fast
optical signals (10 kHz sampling rate, peak sensitivity in the U-band). This
contribution presents the methods used to search for transient optical and very
high energy gamma-ray emission from MAXI J1820+070, as well as the latest
results in these energy ranges.
