Reviewing Epeak relations with Swift and Suzaku data

Hans A. Krimm, Kazutaka Yamaoka, Masanori Ohno, Takanori Sakamoto, Goro Sato, Satoshi Sugita, Makoto Tashiro, R. Hara, H. Tanaka, M. Ohmori, M. Yamauchi, Kaori Onda

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    In recent years several authors have derived correlations between gamma-ray burst (GRB) spectral peak energy (Epeak) and either isotropic-equivalent radiated energy (Eiso) or peak luminosity (Liso). Since these relationships are controversial, but could provide redshift estimators, it is important to determine whether bursts detected by Swift exhibit the same correlations. Swift has greatly added to the number of GRBs for which redshifts are known and hence Eiso and Liso could be calculated. However, for most bursts it is not possible to adequately constrain Epeak with Swift data alone since many GRBs have Epeak above the energy range (15-150 keV) of the Swift Burst Alert Telescope (BAT). Therefore we have analyzed the spectra of 78 bursts (31 with redshift) which were detected by both Swift/BAT and the Suzaku Wide-band All-sky Monitor (WAM), which covers the energy range 50-5000 keV. For most bursts in this sample we can precisely determine Epeak and for bursts with known redshift we can compare how the Epeak relations for the Swift/Suzaku sample compare to earlier published results.

    Original languageEnglish
    Title of host publicationAIP Conference Proceedings
    Number of pages6
    Publication statusPublished - 2009
    Event6th Huntsville Symposium on Gamma-Ray Bursts - Huntsville, AL
    Duration: 2008 Oct 202008 Oct 23


    Other6th Huntsville Symposium on Gamma-Ray Bursts
    CityHuntsville, AL


    • Gamma rays: bursts

    ASJC Scopus subject areas

    • General Physics and Astronomy


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