  Many of the new high energy sources discovered both by INTEGRAL/IBIS and
Swift/BAT have been characterised thanks to extensive, multi-band follow-up
campaigns, but there are still objects whose nature remains to be asserted. In
this paper we investigate the true nature of three high energy sources, IGR
J12134-6015, IGR J16058-7253 and Swift J2037.2+4151, employing multiwavelength
data from the NIR to the X-rays. Through Gaia and ESO-VLT measurements and
through Swift/XRT X-ray spectral analysis, we re-evaluate the classification
for IGR J12134-6015, arguing that the source is a Galactic object and in
particular a Cataclysmic Variable. We were able to confirm, thanks to NuSTAR
observations, that the hard X-ray emission detected by INTEGRAL/IBIS and
Swift/BAT from IGR J16058-7253 is coming from two Seyfert 2 galaxies which are
both counterparts for this source. Through optical and X-ray spectral analysis
of Swift J2037.2+4151 we find that this source is likely part of the rare and
peculiar class of Symbiotic X-ray binaries and displays flux and spectral
variability as well as interesting spectral features, such as a blending of
several emission lines around the iron line complex.
