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 language | English |
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Pages (from-to) | L18-L21 |
Journal | The Astrophysical Journal |
Volume | 697 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2009 |