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Gravitational lensing of gamma-ray bursts (GRBs) can provide an opportunityto probe the massive compact objects in the universe at different redshifts. Wehave discovered two consecutive pulses in the light curve of GRB 090717034,with the same temporal profile and different count rate, separated by a timeinterval, which is identified as gravitationally lensed candidate in Fermi/GBMGRB catalogue \citep{Kalantari}. Here, we use the $\chi^2$ method toinvestigate the similarity of the temporal profile variability of the twopulses as a gravitationally lensed candidate GRB. We find the magnificationfactor and the time delay between two pulses to correspond to minimising the$\chi^2$ function. Then, we perform a Monte Carlo simulation on a sample ofmock lensed GRBs and compare the $\chi^2$ of the lensed GRB candidate with thesimulation, which confirms this candidate with $1\sigma$ confidence level.Assuming that GRB 090717034 is lensed by a point-like object, the redshiftedlens mass is about $M_L(1+z)=(4.220\pm 6.615) \times 10^6 M_{\odot}$. The lensof this GRB is a candidate for a super-massive black hole along the line ofsight to the GRB.

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