Soft X-ray observation of the prompt emission of GRB 100418A

Ritsuko Imatani*, Hiroshi Tomida, Satoshi Nakahira, Masashi Kimura, Takanori Sakamoto, Makoto Arimoto, Yoshitaka Morooka, Daisuke Yonetoku, Nobuyuki Kawai, Hiroshi Tsunemi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We have observed the prompt emission of GRB 100418A from its beginning captured by the MAXI SSC (0.7-7 keV) on board the International Space Station followed by the Swift XRT (0.3-10 keV) observation. The light curve can be fitted by a combination of a power-law component and an exponential component (the decay constant is 31.6 ± 1.6 s). The X-ray spectrum is well expressed by the Band function with Ep ≤ 8.3 keV. This is the brightest gamma-ray burst showing a very low value of Ep. It satisfies the Yonetoku relation (Ep-Lp). It is also consistent with the Amati relation (Ep-Eiso) within a 2.5σ level.

Original languageEnglish
Pages (from-to)S291-S297
JournalPublications of the Astronomical Society of Japan
Publication statusPublished - 2016 Jun 1
Externally publishedYes


  • gamma-ray burst: general
  • gamma-ray burst: individual(GRB 100418A)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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