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In 2018, XMM-Newton observed the awakening in X-rays of the Be/X-ray binary(Be/XRB) A0538-66. It showed bright and fast flares close to periastron withproperties that had never been observed in other Be/XRBs before. We report theresults from the observations of A0538-66 collected during the first all-skysurvey of eROSITA, an X-ray telescope (0.2-10 keV) on board theSpektrum-Roentgen-Gamma (SRG) satellite. eROSITA caught two flares within oneorbital cycle at orbital phases $\phi = 0.29$ and $\phi = 0.93$ (where $\phi=0$corresponds to periastron), with peak luminosities of $\sim 2-4 \times 10^{36}$erg/s (0.2-10 keV) and durations of $42 \leq \Delta t_{\rm fl} \leq 5.7\times10^4$ s. The flare observed at $\phi \approx 0.29$ shows that the neutron starcan accrete considerably far from periastron, although it is expected to beoutside of the circumstellar disk, thus providing important new informationabout the plasma environment surrounding the binary system. We also report theresults from the photometric monitoring of A0538-66 carried out with the REM,OGLE, and MACHO telescopes from January 1993 until March 2020. We found thatthe two sharp peaks that characterize the orbital modulation in the opticaloccur asymmetrically in the orbit, relative to the position of the donor star.

eROSITA detection of flares from the Be/X-ray binary A0538-66