Yonetoku relation of Fermi-GBM and Swift-BAT gamma-ray bursts

Feraol Fana Dirirsa, Soebur Razzaque

Research output: Contribution to journalConference articlepeer-review


We study empirical relation between the intrinsic peak energy Ei,p of the νFν spectrum and the isotropic peak luminosity (Liso) of Gamma-ray burst (GRB) prompt emission in the cosmological source frame. The Ei,p and Liso are computed for all long GRBs detected by the Fermi Gamma-ray Burst Monitor (GBM) and Swift-Burst Alert Telescope (BAT) until the end of December 2017, for which redshift is measured and which has a well defined time-integrated peak spectrum. The GBM has larger sky coverage than BAT but is less sensitive, therefore GRBs that trigger GBM are visible to the BAT. It is very interesting to study the Ei,p–Liso correlation using the samples obtained from both these detectors because each has its own advantages. In both samples, we found that the Ei,p is strongly correlated with the Liso. Using the slope and normalization obtained from our fits, we constructed the Hubble diagram and estimate the cosmological parameters for the GRB samples, and also by combining our GRB samples together with the latest Union Supernovae (SNe) type Ia data.

Original languageEnglish
JournalProceedings of Science
Publication statusPublished - 2018
Event6th High Energy Astrophysics in Southern Africa, HEASA 2018 - Parys, Free State, South Africa
Duration: 1 Aug 20183 Aug 2018

ASJC Scopus subject areas

  • Multidisciplinary


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