Variability in Gamma‐Ray Bursts: A Clue | Zendy

Re’em Sari | Zendy; Tsvi Piran | Zendy

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Variability in Gamma‐Ray Bursts: A Clue

Author(s) -

Re’em Sari,

Tsvi Piran

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/304428

Subject(s) - gamma ray burst , jet (fluid) , physics , radiation , astrophysics , variable (mathematics) , mechanics , optics , mathematics , mathematical analysis

We show that external shocks cannot produce a variable GRB, unless they areproduced by an extremely narrow jets (angular opening of < ~10^{-4}) or if onlya small fraction of the shell emits the radiation and the process is veryinefficient. Internal shocks can produce the observed complex temporalstructure provided that the source itself is variable. In this case, theobserved temporal structure reflects the activity of the ``inner engine'' thatdrives the bursts. This sets direct constraints on it.

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