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The High Energy Modular Ensemble of Satellites (HERMES) project is aimed torealize a modular X/gamma-ray monitor for transient events, to be placedon-board of a CubeSat bus. This expandable platform will achieve a significantimpact on Gamma Ray Burst (GRB) science and on the detection of GravitationalWave (GW) electromagnetic counterparts: the recent LIGO/VIRGO discoveriesdemonstrated that the high-energy transient sky is still a field of extremeinterest. The very complex temporal variability of GRBs (up to the millisecondscale) combined with the spatial and temporal coincidence between GWs and theirelectromagnetic counterparts suggest that upcoming instruments require sub-mstime resolution combined with a transient localization accuracy lower than adegree. The current phase of the ongoing HERMES project is focused on therealization of a technological pathfinder with a small network (3 units) ofnano-satellites to be launched in mid 2020. We will show the potential andprospects for short and medium-term development of the project, demonstratingthe disrupting possibilities for scientific investigations provided by theinnovative concept of a new "modular astronomy" with nano-satellites (e.g. lowdeveloping costs, very short realization time). Finally, we will illustrate thecharacteristics of the HERMES Technological Pathfinder project, demonstratinghow the scientific goals discussed are actually already reachable with thefirst nano-satellites of this constellation. The detector architecture will bedescribed in detail, showing that the new generation of scintillators (e.g.GAGG:Ce) coupled with very performing Silicon Drift Detectors (SDD) and lownoise Front-End-Electronics (FEE) are able to extend down to few keV thesensitivity band of the detector. The technical solutions for FEE,Back-End-Electronics (BEE) and Data Handling will be also described.

HERMES: An ultra-wide band X and gamma-ray transient monitor on board a nano-satellite constellation