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I know that the space-time has curvature. Also I have basic knowledge about the gamma-ray bursts.

I would like to know if a same pulse of GRB can affect the same place of the space twice times. Is it impossible? Thank you.

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    $\begingroup$ You might need to be precise about the dimensions of the same "place". $\endgroup$
    – user179430
    Dec 23, 2017 at 22:33
  • $\begingroup$ I accept your words (critic) @Countto10 , thank you and thanks to who answered the question. $\endgroup$
    – user174701
    Dec 24, 2017 at 21:02

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A gamma ray burst is a electromagnetic signal, so the question is can be re-written as "Can a light signal arrive at one point at two or more times?"

And the answer to that question is "Yes", we see light signals from distant quasars along different paths due to gravitational microlensing all the time, and when there are more that one distinct images (as opposed to a continuous smear), the paths can have different travel times (the minimum time requirement is local).

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