A study of the electromagnetic counterpart of binary neutron star mergers LIGO/Virgo GW170817 and GRB 1701718A and GRB 211211A has been conducted. The electromagnetic counterpart reflects the observations of GRB 211211A and LIGO/Virgo GW170817. A study of the spectral evolution of GRB X-ray tails has been conducted. In addition, a study of the shape of…