Gravitational microlensing of gamma-ray bursts

Statistics – Computation

Scientific paper

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Black Holes (Astronomy), Computational Astrophysics, Gamma Ray Bursts, Gravitational Lenses, Astronomical Catalogs, Density Distribution, Galactic Halos, Monte Carlo Method, Red Shift

Scientific paper

A Monte Carlo code is developed to calculate gravitational microlensing in three dimensions when the lensing optical depth is low or moderate (not greater than 0.25). The code calculates positions of microimages and time delays between the microimages. The majority of lensed gamma-ray bursts should show a simple double-burst structure, as predicted by a single point mass lens model. A small fraction should show complicated multiple events due to the collective effects of several point masses (black holes). Cosmological models with a significant fraction of mass density in massive compact objects can be tested by searching for microlensing events in the current BATSE data. Our catalog generated by 10,000 Monte Carlo models is accessible through the computer network. The catalog can be used to take realistic selection effects into account.

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