A deep study of the high–energy transient sky

Abstract The coming decades will establish the exploration of gravitational wave (GW) Universe over a broad frequency range by ground and space interferometers. Meanwhile, wide-field, high-cadence sensitive surveys span electromagnetic spectrum from radio all way up to TeV, as well high-energy neutrino window. Among numerous classes transients, ? –ray bursts (GRBs) have direct links with most hot topics that be addressed, such strong gravity regime, relativistic shocks, particle acceleration processes, equation state matter at nuclear density, nucleosynthesis heavy elements, just mention few. Other recently discovered transients are observed throughout cosmological distances include fast (FRBs), blue optical (FBOTs), other unidentified transients. Here we discuss how these can addressed mission called ASTENA (Advanced Surveyor Transient Events Nuclear Astrophysics, see Frontera et al. 18). Its payload combines two instruments: (i) an array wide-field monitors imaging, spectroscopic, polarimetric capabilities (WFM-IS); (ii) narrow field telescope (NFT) based on Laue lens operating in 50–600 keV unprecedented angular resolution, capabilities, sensitivity.