Swift XRT pile-up correction and the canonical gamma ray burst lightcurve – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Calendar > 2007 > Pile-up correction and...

Swift XRT pile-up correction and the canonical gamma ray burst lightcurve

 Jón Hafsteinn Guðmundsson's masters defence, Niels Bohr Institute and Dark Cosmology Centre.

 In this thesis we present a new function to correct for pile-up in Swift XRT gamma ray burst data and use that correction to try to find empirically the parameters to describe the canonical GRB X-ray afterglow lightcurve. The correction function is arrived at by by plotting the measured countrate against the corrected (by hand) countrate for various bursts at various times and fitting a function to the dataset. The purpose of finding this function was to be able to correct a large number of lightcurves quickly because we wished to search for an empirical description of the canonical GRB afterglow lightcurve. Armed with this function we then find the main parameters of the X-ray afterglow lightcurve (slopes and breaktimes) for chosen bursts and use them in correlation plots to try to determine a function to describe the canonical lightcurve.