HETE-2 Observations of the X-Ray Flash XRF 040916

Makoto Arimoto; Nobuyuki Kawai; Atsumasa Yoshida; Toru Tamagawa; Yuji Shirasaki; Motoko Suzuki; Masaru Matsuoka; Jun'ichi Kotoku; Rie Sato; Takashi Shimokawabe; Nicolas Vasquez Pazmino; Takuto Ishimura; Yujin Nakagawa; Nobuyuki Ishikawa; Akina Kobayashi; Satoshi Sugita; Ichiro Takahashi; Makoto Kuwahara; Makoto Yamauchi; Kunio Takagishi; Isamu 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-Francios Olive; Joao Braga; Ravi Manchanda; Graziella Pizzichini

doi:10.1093/pasj/59.3.695

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HETE-2 Observations of the X-Ray Flash XRF 040916

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Abstract

A long X-ray flash was detected and localized by the 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 consists of two peaks separated by 200 s, with durations of 110 s and 60 s. We have 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 flux variabilities and timescales. We find that it is most likely part of the prompt emission, and is explained by the 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.

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Makoto Arimoto, Nobuyuki Kawai, Atsumasa Yoshida, Toru Tamagawa, Yuji Shirasaki, Motoko Suzuki, Masaru Matsuoka, Jun'ichi Kotoku, Rie Sato, Takashi Shimokawabe, Nicolas Vasquez Pazmino, Takuto Ishimura, Yujin Nakagawa, Nobuyuki Ishikawa, Akina Kobayashi, Satoshi Sugita, Ichiro Takahashi, Makoto Kuwahara, Makoto Yamauchi, Kunio Takagishi, Isamu 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-Francios Olive, Joao Braga, Ravi Manchanda, Graziella Pizzichini. 2007-03-07. HETE-2 Observations of the X-Ray Flash XRF 040916. https://doi.org/10.1093/pasj%2F59.3.695

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