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MeV blazars are a sub--population of the blazar family, exhibitinglarger--than--average jet powers, accretion luminosities and black hole masses.Because of their extremely hard X--ray continua, these objects are best studiedin the X-ray domain. Here, we report on the discovery by the $Fermi$ Large AreaTelescope and subsequent follow-up observations with $NuSTAR$, $Swift$ andGROND of a new member of the MeV blazar family: PMN J0641$-$0320. Our opticalspectroscopy provides confirmation that this is a flat--spectrum radio quasarlocated at a redshift of $z=1.196$. Its very hard $NuSTAR$ spectrum (power--lawphoton index of $\sim$1 up to $\sim$80 keV) indicates that the emission isproduced via inverse Compton scattering off photons coming from outside thejet.The overall spectral energy distribution of PMN J0641$-$0320 is typical ofpowerful blazars and by reproducing it with a simple one-zone leptonic emissionmodel we find the emission region to be located either inside the broad lineregion or within the dusty torus.

NuSTAR, Swift, and GROND observations of the flaring MeV blazar: PMN J0641$-$0320