# On the possibility of registering X-ray flares related to fast radio bursts with the SRG/eROSITA telescope

## TL;DR

This paper explores the potential for the eROSITA telescope to detect X-ray counterparts to fast radio bursts, estimating detection rates and distances to improve understanding of their origins.

## Contribution

It assesses the detectability of X-ray emissions from fast radio bursts with eROSITA, providing estimates of detection rates and distance ranges for different spectral models.

## Key findings

- Approximately 300 bursts expected during four years of survey.
- About 1% of bursts detectable by ground-based radio telescopes.
- X-ray flares detectable up to 1 Gpc depending on spectral parameters.

## Abstract

In this note we discuss the possibility of detecting the accompanying X-ray emission from sources of fast radio bursts with the eROSITA telescope onboard the Spektr-RG observatory. It is shown that during four years of the survey program about 300 bursts are expected to appear in the field of view of eROSITA. About 1\% of them will be detected by ground-based radio telescopes. For a total energy release $\sim~10^{46}$~ergs depending on the spectral parameters and absorption in the interstellar and intergalactic media, an X-ray flare can be detected from distances from $\sim 1$~Mpc (thermal spectrum with $kT=200$~keV and strong absorption) up to $\sim1$~Gpc (power-law spectrum with photon index $\Gamma=2 $ and realistic absorption). Thus, eROSITA observations might help to provide important constraints on parameters of sources of fast radio bursts, or may even allow to identify the X-ray transient counterparts, which will help to constrain models of fast radio bursts generation.