Early afterglow and variability

Kunihito Ioka, Shiho Kobayashi, Bing Zhang, Toma Kenji, Ryo Yamazaki, Takashi Nakamura

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

1 Citation (Scopus)

Abstract

We show that simple kinematic arguments can give limits on variabilities in gamma-ray burst (GRB) afterglows. These limits are violated by X-ray flares in the early afterglows recently identified by the Swift satellite. We discuss that a probable solution is that the central engine continues to eject an intermittent outflow for a very long timescale up to 1 day. This long-lived engine model may also explain the flat decay of early X-ray afterglows, while the gamma-ray efficiency of GRBs should be incredibly high (>75-90%) in this model. We suggest new possible models to evade this efficiency crisis and discuss implications for future observations.

Original languageEnglish
Title of host publicationGAMMA-RAY BURSTS IN THE SWIFT ERA
Subtitle of host publicationSixteenth Maryland Astrophysics Conference
Pages301-304
Number of pages4
DOIs
Publication statusPublished - 2006 May 19
Externally publishedYes
EventGAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference - Washington, D.C., United States
Duration: 2005 Nov 292005 Dec 2

Publication series

NameAIP Conference Proceedings
Volume836
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceGAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference
CountryUnited States
CityWashington, D.C.
Period05/11/2905/12/2

Keywords

  • Gamma rays: bursts
  • Gamma rays: theory
  • Relativity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Ioka, K., Kobayashi, S., Zhang, B., Kenji, T., Yamazaki, R., & Nakamura, T. (2006). Early afterglow and variability. In GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference (pp. 301-304). (AIP Conference Proceedings; Vol. 836). https://doi.org/10.1063/1.2207907