Zeinab Kalantari

Department of Physics, Sharif University of Technology

Fermi-GBM Observation of GRB090717034: $\chi^2$ Test Confirms Evidence of Gravitational Lensing by a Supermassive Black Hole with a Million Solar Mass

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Abstract: Gamma-ray bursts (GRBs) are one of the most luminous and prolific high-energy transients observed since their discovery in 1963. The theoretical investigations of gravitational lensing of GRBs have been carried out in the past half-century. In this talk, I will briefly review Gamma_Ray Bursts (GRBs) detections and progenitors. Next, I will give a general overview of gravitational microlensing and its observable signature on a GRB light curve for a point mass model of the lens. Then, I will highlight the results of our recent probe in the Fermi/GBM catalog and introduce one gravitationally lensed candidate which is discerned by the Autocorrelation method. Finally, we use the minimization of $\chi^2$ of the light curve of our candidate which confirms this candidate has a true lensing signature of a supermassive black hole with a redshifted mass of $\approx10^6 M_\odot$  and two peaks in this event is not a result of stochastic random fluctuations in the GRB light curve.

یکشنبه 22 آبان 1401، ساعت 17:00

Sunday 13 November 2022 – 17:00 Tehran Time

Hybrid Seminar

دانشکده فیزیک-اتاق 626–Physics department Room 626  /

https://vc.sharif.edu/ch/cosmology

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