Prospects for Recording X-ray Flares Accompanying Fast Radio Bursts with the SRG/eROSITA Telescope

We consider the possibility of detecting the accompanying X-ray emission from the sources of fast radio bursts with the eROSITA telescope onboard the Spectrum-Roentgen-Gamma (SRG) satellite. We show that up to 300 radio bursts can fall within the eROSITA field of view in four years of survey observations. About 1% of them will be recorded by ground-based radio telescopes. At a total X-ray energy release of approximate to 10(46) erg, depending on the spectral parameters and absorption in the interstellar and intergalactic media, an X-ray flare can be recorded from distances from 1 Mpc (a thermal spectrum with a temperature of 200 keV and strong absorption) to 1 Gpc (a power-law spectrum with a photon index = 2 and realistic absorption). Thus, SRG/eROSITA data can provide important constraints on the parameters of the sources of fast radio bursts and, probably, also to identify the sources in the X-ray band, which will make it possible to choose the models describing the generation of these bursts.