Owing to the detection of an extremely bright fast radio burst ( FRB ) 200428 associated with a hard X-ray counterpart from the magnetar soft gamma-ray repeater ( SGR ) 1935+2154 , the distance of SGR 1935+2154 potentially hosted in the supernova remnant ( SNR ) G57.2+0.8 can be revisited .
Under the assumption that the SGR and the SNR are physically related , in this Letter , by investigating the dispersion measure ( DM ) of the FRB contributed by the foreground medium of our Galaxy and the local environments and combining with other observational constraints , we find that the distance of SGR 1935+2154 turns out to be 9.0 \pm 2.5 kpc and the SNR radius falls into 10 to 18 pc since the local DM contribution is as low as 0 - 18 pc cm ^ { -3 } .
These results are basically consistent with the previous studies .
In addition , an estimate for the Faraday rotation measure of the SGR and SNR is also carried out .