Evidence for gravitational lensing of GRB 200716C [HEAP]

http://arxiv.org/abs/2107.11050


Observationally, there are a small fraction GRBs prompt emission observed by Fermi/GBM that are composed of two pulses. Occasionally, the cosmological distance of GRB may be lensed when a high mass astrophysical object reside in path between GRB source and observer. In this paper, we are lucky to find out GRB 200716C with two-pulse emission which duration is a few seconds. We present a Bayesian analysis identifying gravitational lensing in both temporal and spectral properties, and calculate the time decay ($\Delta t\sim 1.92$ s) and magnification ($\gamma\sim 1.5$) between those two pulses based on the temporal fits. One can roughly estimate the lens mass is about $2.38\times 10^{5}~M_{\odot}$ in the rest frame. If the first pulse of this GRB near triggered time is indeed gravitationally echoed by a second pulse, GRB 200716C may be a short GRB candidate with extended emission.

Read this paper on arXiv…

X. Yang, H. Lü, H. Yuan, et. al.
Mon, 26 Jul 21
28/62

Comments: 17 pages, 5 figures