  Multi-messenger astronomy received a great boost following the discovery of
kilonova AT2017gfo, the optical counterpart of the gravitational wave source
GW170817 associated with the short gamma-ray burst GRB 170817A. AT2017gfo was
the first kilonova that could be extensively monitored in time both
photometrically and spectroscopically. Previously, only few candidates have
been observed against the glare of short GRB afterglows. In this work, we aim
to search the fingerprints of AT2017gfo-like kilonova emissions in the
optical/NIR light curves of 39 short GRBs with known redshift. For the first
time, our results allow us to study separately the range of luminosity of the
blue and red components of AT2017gfo-like kilonovae in short GRBs. In
particular, the red component is similar in luminosity to AT2017gfo, while the
blue kilonova can be more than 10 times brighter. Finally, we find further
evidence to support all the claimed kilonova detections and we exclude an
AT2017gfo-like kilonova in GRBs 050509B and 061201.
