Redshift Estimates for Short Gamma-Ray Bursts from the Fermi-GBM Catalogue Using Ep,i-Eiso Correlation

May 18, 2022, 4:45 PM
20m

Speaker

Dr Yerlan Aimuratov (Fesenkov Astrophysical Institute / al-Farabi Kazakh National University)

Description

Currently operating and future planned missions need robust methods in determining the distances to GRBs. We purpose to provide a simple method for estimating distances to cosmological gamma-ray bursts. We construct $E_{\rm p, i}$-$E_{\rm iso}$ correlation for short gamma-ray bursts based on events with well established spectral peak energies. Applying minimal criteria, we sample SGRBs from the GBM catalogue and calculate spectral peak energy and isotropic energy using a range of distances between maximal and minimal observed redshifts. We iterate through a range of redshifts, and each event is examined for the condition to cross the main line of the $E_{\rm p, i}$-$E_{\rm iso}$ relation and additionally, its $\pm1\sigma$ and $\pm3\sigma$ uncertainty areas. Consequently, we take those intersections as the best redshift estimates for an individual burst. Redshifts estimated in such a way are then compared to those bursts with measured distances.

Primary author

Dr Yerlan Aimuratov (Fesenkov Astrophysical Institute / al-Farabi Kazakh National University)

Co-authors

Dr Marco Muccino (Laboratori Nazionali di Frascati (INFN)) Dr Manas Khassanov (al-Farabi Kazakh National University) Prof. Medeu Abishev (al-Farabi Kazakh National University)

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