  The discovery of gravitational waves and gamma-ray bursts heralds the era of
multi-messenger astronomy. With the adoption of two small satellites to achieve
the all-sky monitoring of gamma-ray bursts, the gravitational wave high-energy
electromagnetic counterpart all-sky monitor (GECAM) possesses a quasi-real-time
early warning ability and plays an important role in positioning the sources of
gravitational waves and in subsequent observations.
