  Fast radio bursts (FRBs) are an enigmatic class of extragalactic transients
emitting Jy-level radio bursts in the GHz band, lasting for only a few ms. So
far, some objects are known to repeat while several others are not, likely
indicating multiple origins. There are many theoretical models, some predict
prompt VHE or optical emission correlated with FRBs while others imply VHE
afterglows hours after the FRB. To test these predictions and unravel the
nature of FRB progenitors, the stereoscopic Imaging Atmospheric Cherenkov
Telescopes (IACTs) system MAGIC has been participating in FRB observation
campaigns since 2016. As IACTs are sensitive to Cherenkov photons in the
UV/blue region of the electromagnetic spectrum and use photo-detectors with
time response faster than a ms, MAGIC is also able to perform simultaneous
optical observations through a dedicated system installed in the central PMT of
its camera. The main challenge faced by MAGIC in searching for optical
counterpart of FRBs is the presence of irreducible background optical events
due to terrestrial sources. We present new results from MAGIC observations of
the first repeating FRB 121102 during several MWL observation campaigns. The
recently improved instrument and refined strategy to search for counterparts of
FRBs in the VHE and optical bands will also be presented.
