  The Gamma-Ray Integrated Detectors (GRID) is a space mission concept
dedicated to monitoring the transient gamma-ray sky in the energy range from 10
keV to 2 MeV using scintillation detectors onboard CubeSats in low Earth
orbits. The primary targets of GRID are the gamma-ray bursts (GRBs) in the
local universe. The scientific goal of GRID is, in synergy with ground-based
gravitational wave (GW) detectors such as LIGO and VIRGO, to accumulate a
sample of GRBs associated with the merger of two compact stars and study jets
and related physics of those objects. It also involves observing and studying
other gamma-ray transients such as long GRBs, soft gamma-ray repeaters,
terrestrial gamma-ray flashes, and solar flares. With multiple CubeSats in
various orbits, GRID is unaffected by the Earth occultation and serves as a
full-time and all-sky monitor. Assuming a horizon of 200 Mpc for ground-based
GW detectors, we expect to see a few associated GW-GRB events per year. With
about 10 CubeSats in operation, GRID is capable of localizing a faint GRB like
170817A with a 90% error radius of about 10 degrees, through triangulation and
flux modulation. GRID is proposed and developed by students, with considerable
contribution from undergraduate students, and will remain operated as a student
project in the future. The current GRID collaboration involves more than 20
institutes and keeps growing. On August 29th, the first GRID detector onboard a
CubeSat was launched into a Sun-synchronous orbit and is currently under test.
