CAOSP abstracts, Volume: 47, No.: 2, year: 2017

Author(s): Rácz, I.I.; Bagoly, Z.; Tóth, L.V.; Balázs, L.G.; Horváth, I.; Pintér, S.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 47, no. 2, p. 100-107.
Date: 7/2017
Title: Galactic and extragalactic hydrogen in the X-ray spectra of Gamma Ray Bursts
Keyword(s): Gamma-ray bursts, X-rays: general
Pages: 100 -- 107

Abstract: Two types of emission can be observed from gamma-ray bursts (GRBs): the prompt emission from the central engine which can be observed in gamma or X-ray (as a low energy tail) and the afterglow from the environment in X-ray and at shorter frequencies. We examined the Swift XRT spectra with the XSPEC software. The correct estimation of the galactic interstellar medium is very important because we observe the host emission together with the galactic hydrogen absorption. We found that the estimated intrinsic hydrogen column density and the X-ray flux depend heavily on the redshift and the galactic foreground hydrogen. We also found that the initial parameters of the iteration and the cosmological parameters did not have much effect on the fitting result.