OBSERVATION OF CORRELATED OPTICAL AND GAMMA EMISSIONS FROM GRB 081126

A. Klotz, B. Gendre, J.L. Atteia, M. Boa«r, David Coward, Alan Imerito

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    Abstract

    We present an analysis of time-resolved optical emissions observed from the gamma-ray burst GRB 081126 duringthe prompt phase. The analysis employed time-resolved photometry using optical data obtained by the TAROTtelescope, using BAT data from the Swift spacecraft, and time-resolved spectroscopy at high energies from the GBMinstrument onboard the Fermi spacecraft. The optical emission of GRB 081126 is found to be compatible with thesecond gamma emission pulse shifted by a positive time lag of 8.4 ±3.9 s. This is the first well-resolved observationof a time lag between optical and gamma emissions during a gamma-ray burst. Our observations could potentiallyprovide new constraints on the fireball model for gamma-ray burst early emissions. Furthermore, observations oftime lags between optical and gamma ray photons provides an exciting opportunity to constrain quantum gravitytheories.
    Original languageEnglish
    Pages (from-to)L18-L21
    JournalThe Astrophysical Journal
    Volume697
    Issue number1
    DOIs
    Publication statusPublished - 2009

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