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GrailQuest (Gamma Ray Astronomy International Laboratory for QUantumExploration of Space-Time) is a mission concept based on a constellation(hundreds/thousands) of nano/micro/small-satellites in low (or near) Earthorbits. Each satellite hosts a non-collimated array of scintillator crystalscoupled with Silicon Drift Detectors with broad energy band coverage (keV-MeVrange) and excellent temporal resolution ( below or equal 100 nanoseconds) eachwith effective area around 100 cm2. This simple and robust design allows formass-production of the satellites of the fleet. This revolutionary approachimplies a huge reduction of costs, flexibility in the segmented launchingstrategy, and an incremental long-term plan to increase the number of detectorsand their performance: a living observatory for next-generation, space-basedastronomical facilities. GrailQuest is conceived as an all-sky monitor for fastlocalisation of high signal-to-noise ratio transients in the X/gamma-ray band,e.g. the elusive electromagnetic counterparts of gravitational wave events.Robust temporal triangulation techniques will allow unprecedented localisationcapabilities, in the keV-MeV band, of a few arcseconds or below, depending onthe temporal structure of the transient event. The ambitious ultimate goal ofthis mission is to perform the first experiment, in quantum gravity, todirectly probe space-time structure down to the minuscule Planck scale, byconstraining or measuring a first order dispersion relation for light in vacuo.This is obtained by detecting delays between photons of different energies inthe prompt emission of Gamma-ray Bursts.

ESA Voyage 2050 white paper -- GrailQuest: hunting for Atoms of Space and Time hidden in the wrinkle of Space-Time