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Gamma-ray bursts are the most luminous explosions that we can witness in theUniverse. Studying the most extreme cases of these phenomena allows us toconstrain the limits for the progenitor models. In this Letter, we study theprompt emission, afterglow, and host galaxy of GRB 120624B, one of thebrightest GRBs detected by Fermi, to derive the energetics of the event andcharacterise the host galaxy in which it was produced. Following thehigh-energy detection we conducted a multi-wavelength follow-up campaign,including near-infrared imaging from HAWKI/VLT, optical from OSIRIS/GTC, X-rayobservations from the Chandra X-ray Observatory and atsub-millimetre/millimetre wavelengths from SMA. Optical/nIR spectroscopy wasperformed with X-shooter/VLT. We detect the X-ray and nIR afterglow of theburst and determine a redshift of z = 2.1974 +/- 0.0002 through theidentification of emission lines of [OII], [OIII] and H-alpha from the hostgalaxy of the GRB. This implies an energy release of Eiso = (3.0+/-0.2)x10^54erg, amongst the most luminous ever detected. The observations of the afterglowindicate high obscuration with AV > 1.5. The host galaxy is compact, with R1/2< 1.6 kpc, but luminous, at L ~ 1.5 L* and has a star formation rate of 91 +/-6 Msol/yr as derived from H-alpha. As other highly obscured GRBs, GRB 120624Bis hosted by a luminous galaxy, which we also proof to be compact, with a veryintense star formation. It is one of the most luminous host galaxies associatedwith a GRB, showing that the host galaxies of long GRBs are not always bluedwarf galaxies, as previously thought.

The obscured hyper-energetic GRB 120624B hosted by a luminous compact galaxy at z = 2.20