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• W4288709968 abstract "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 consecutive pulses in the light curve of GRB 090717034, with the same temporal profile and different count rate, separated by a time interval, which is identified as gravitationally lensed candidate in Fermi/GBM GRB catalogue citep{Kalantari}. Here, we use the $chi^2$ method to investigate the similarity of the temporal profile variability of the two pulses as a gravitationally lensed candidate GRB. We find the magnification factor 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 of mock lensed GRBs and compare the $chi^2$ of the lensed GRB candidate with the simulation, which confirms this candidate with $1sigma$ confidence level. Assuming that GRB 090717034 is lensed by a point-like object, the redshifted lens mass is about $M_L(1+z)=(4.220pm 6.615) times 10^6 M_{odot}$. The lens of this GRB is a candidate for a super-massive black hole along the line of sight to the GRB." @default.
• W4288709968 created "2022-07-30" @default.
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• W4288709968 date "2022-07-29" @default.
• W4288709968 modified "2023-09-25" @default.
• W4288709968 title "Fermi-GBM Observation of GRB 090717034: χ ² Test Confirms Evidence of Gravitational Lensing by a Supermassive Black Hole with a Million Solar Mass" @default.
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• W4288709968 doi "https://doi.org/10.3847/1538-4357/ac7da9" @default.
• W4288709968 hasPublicationYear "2022" @default.
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