HETE-2 observations of the X-ray flash XRF 040916

Makoto Arimoto, Nobuyuki Kawai, Motoko Suzuki, Rie Sato, Nicolas Vasquez Pazmino, Takashi Shimokawabe, Takuto Ishimura, Ju N.Ichi Kotoku, Atsumasa Yoshida, Toru Tamagawa, Yuji Shirasaki, Masaru Matsuoka, Yujin Nakagawa, Nobuyuki Ishikawa, Akina Kobayashi, Satoshi Sugita, Ichiro Takahashi, Makoto Kuwahara, Makoto Yamauchi, Kunio TakagishiIsamu Hatsukade, Jean Luc Atteia, Alexandre Pelangeon, Roland Vanderspek, Carlo Graziani, Gregory Prigozhin, Joel Villasenor, J. Garrett Jernigan, Geoffrey B. Crew, Kevin Hurley, Takanori Sakamoto, George R. Ricker, Stanford E. Woosley, Nat Butler, Al Levine, John P. Doty, Timothy Q. Donaghy, Donald Q. Lamb, Edward E. Fenimore, Mark Galassi, Michel Boer, Jean Pascal Dezalay, Jean François Olive, Joao Braga, Ravi Manchanda, Grazieila Pizzichini

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A long X-ray flash was detected and localized by instruments aboard the High Energy Transient Explorer II (HETE-2) at 00:03:30 UT on 2004 September 16. The position was reported to the GRB Coordinates Network (GCN) approximately 2 hours after the burst. This burst consisted of two peaks separated by ∼ 200 s, with durations of about 110 s and 60 s. We analyzed the energy spectra of the 1st and 2nd peaks observed with the Wide Field X-Ray Monitor (WXM) and the French Gamma Telescope (FREGATE). We discuss the origin of the 2nd peak in terms of the flux variabilities and timescales. We find that it is most likely to be part of prompt emission, and is explained by a long-acting engine model. This feature is similar to some bright X-ray flares detected in the early afterglow phase of bursts observed by the Swift satellite.

Original languageEnglish (US)
Pages (from-to)695-702
Number of pages8
JournalPublications of the Astronomical Society of Japan
Issue number3
StatePublished - 2007
Externally publishedYes


  • Gamma-rays: bursts
  • X-rays: bursts
  • X-rays: individual (XRF 040916)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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