Search for a Signature of Interaction between Relativistic Jet and Progenitor in Gamma-Ray Bursts

Kazuki Yoshida, Daisuke Yoneoku, Tatsuya Sawano, Hirotaka Ito, Jin Matsumoto, Shigehiro Nagataki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The time variability of prompt emission in gamma-ray bursts (GRBs) is expected to originate from the temporal behavior of the central engine activity and the jet propagation in the massive stellar envelope. Using a pulse search algorithm for bright GRBs, we investigate the time variability of gamma-ray light curves to search a signature of the interaction between the jet and the inner structure of the progenitor. Since this signature might appear in the earlier phase of prompt emission, we divide the light curves into the initial phase and the late phase by referring to the trigger time and the burst duration of each GRB. We also adopt this algorithm for GRBs associated with supernovae/hypernovae that certainly are accompanied by massive stars. However, there is no difference between each pulse interval distribution described by a lognorma distribution in the two phases. We confirm that this result can be explained by the photospheric emission model if the energy injection of the central engine is not steady or completely periodic but episodic and described by the lognormal distribution with a mean of ∼1 s.

Original languageEnglish
Article number64
JournalAstrophysical Journal
Volume849
Issue number1
DOIs
Publication statusPublished - 2017 Nov 1
Externally publishedYes

Keywords

  • gamma-ray burst: general
  • methods: statistical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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