Fermi-GBM Observation of GRB 090717034: ${\chi }^2$ Test Confirms Evidence of Gravitational Lensing by a Supermassive Black Hole with Million Solar Mass

Zeinab Kalantari, Sohrab Rahvar, Alaa Ibrahim

Gravitational lensing of gamma-ray bursts (GRBs) can provide an opportunity to probe the massive compact objects in the universe at different redshifts. We have discovered two cons…