Study of a nano-satellite constellation for the multi-messenger astronomy

With the advent of sensitive gravitational wave (GW) and neutrino detectors, new messengers are available to study the Universe and its contents. To fully exploit the wealth of forthcoming discoveries by multi-messenger facilities, it is crucial to detect as many electromagnetic (EM) counterparts as possible. 3U Transat (3U cosmic TRANsient SATellites) is a French project for building a Low Earth Orbit (LEO) nano-satellites constellation to survey the high energy transient sky. Each science payload mimics a 1-D coded mask providing a 1-D localization by arranging in a cylindrical configuration 7 NaI(Ti) detectors of 8 cm long and Ø 1.2 cm coupled with silicon photomultipliers. In this talk, I will present the 3U Transat mission and its main scientific goals as well as the dynamical mission simulation we have built to assess the constellation performances as a function of multi-parameters .I will present highlights of the performance results.