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Observationally, there is a small fraction of Gamma-ray bursts (GRBs) withprompt emission observed by Fermi/GBM that are composed of two pulses.Occasionally, the distance to a GRB may be lensed when a high massastrophysical object resides in the path between the GRB source and observer.In this paper, we describe GRB 200716C, which has a two-pulse emission andduration of a few seconds. We present a Bayesian analysis identifyinggravitational lensing in both temporal and spectral properties, and calculatethe time delay ($\Delta t\sim 1.92$ s) and magnification ($\gamma\sim 1.5$)between those two pulses based on the temporal fits. One can roughly estimatethe lens mass to be about $2.4\times 10^{5}~M_{\odot}$ in the rest frame. Wealso calculate the false alarm probability for this detection to be about0.07\% with trial factors, and a present-day number density of about $808\rm~Mpc^{-3}$ with an energy density $\Omega\sim 1.4\times 10^{-3}$. If thefirst pulse of this GRB near the trigger time is indeed gravitationally echoedby a second pulse, GRB 200716C may be a short GRB candidate with extendedemission.

Evidence for gravitational lensing of GRB 200716C