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Energy input and response from prompt and early optical afterglow emission in γ-ray bursts

Author

Listed:
  • W. T. Vestrand

    (Space Science and Applications Group, ISR-1, MS-D466)

  • J. A. Wren

    (Space Science and Applications Group, ISR-1, MS-D466)

  • P. R. Wozniak

    (Space Science and Applications Group, ISR-1, MS-D466)

  • R. Aptekar

    (Ioffe Physico-Technical Institute)

  • S. Golentskii

    (Ioffe Physico-Technical Institute)

  • V. Pal'shin

    (Ioffe Physico-Technical Institute)

  • T. Sakamoto

    (NASA Goddard Space Flight Center, Code 661)

  • R. R. White

    (Space Science and Applications Group, ISR-1, MS-D466)

  • S. Evans

    (Space Science and Applications Group, ISR-1, MS-D466)

  • D. Casperson

    (Space Science and Applications Group, ISR-1, MS-D466)

  • E. Fenimore

    (Space Science and Applications Group, ISR-1, MS-D466)

Abstract

First lights When a bright γ-ray burst is sighted, two distinct types of optical emission are seen during the first few minutes after the burst: the 'prompt' emission and the early afterglow. GRB 050820a, a burst that occurred on 20 August last year, provided astronomers with the opportunity to answer the question: “when does the early afterglow begin?“ The answer: not at the burst trigger time as is normally assumed. Rather, it seems to be a response or reverberation related to the energy release measured by the prompt optical and γ-ray emission. This opens a new area of γ-ray burst research because the response to the impulse energy can be used to probe the properties of the jet and the surrounding medium.

Suggested Citation

  • W. T. Vestrand & J. A. Wren & P. R. Wozniak & R. Aptekar & S. Golentskii & V. Pal'shin & T. Sakamoto & R. R. White & S. Evans & D. Casperson & E. Fenimore, 2006. "Energy input and response from prompt and early optical afterglow emission in γ-ray bursts," Nature, Nature, vol. 442(7099), pages 172-175, July.
    • Handle: RePEc:nat:nature:v:442:y:2006:i:7099:d:10.1038_nature04913
    DOI: 10.1038/nature04913
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