Spectral-lag relations in GRB pulses detected with HETE-2

Makoto Arimoto, Nobuyuki Kawai, Katsuaki Asano, Kevin Hurley, Motoko Suzuki, Yujin E. Nakagawa, Takashi Shimokawabe, Nicolas Vasquez Pazmino, Rie Sato, Masaru Matsuoka, Atsumasa Yoshida, Toru Tamagawa, Yuji Shirasaki, Satoshi Sugita, Ichiro Takahashi, Jean Luc Atteia, Alexandre Pelangeon, Roland Vanderspek, Carlo Graziani, Gregory PrigozhinJoel Villasenor, J. Garrett Jernigan, Geoffrey B. Crew, Takanori Sakamoto, George R. Ricker, Stanford E. Woosley, Nat Butler, Alan Levine, John P. Doty, Timothy Q. Donaghy, Donald Q. Lamb, Edward Fenimore, Mark Galassi, Michel Boer, Jean Pascal Dezalay, Jean François Olive, João Braga, Ravi Manchanda, Graziella Pizzichini

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Using a pulse-fit method, we investigated the spectral lags between the traditional gamma-ray band (50-400 keV) and the X-ray band (6-25keV) for 8 GRBs with known redshifts (GRB 010921, GRB 020124, GRB 020127, GRB 021211, GRB 030528, GRB 040924, GRB 041006, and GRB 050408), detected with the WXM and FREGATE instruments aboard the HETE-2 satellite. We found several relations for individual GRB pulses between the spectral lag and other observables, such as the luminosity, pulse duration, and peak energy, Epeak. The obtained results are consistent with those for BATSE, indicating that the BATSE correlations are still valid at lower energies (6-25 keV). Furthermore, we found that me photon energy dependence for the spectral lags can be reconciled with the simple curvature effect model. We discuss the implications of these results from various points of view.

Original languageEnglish (US)
Pages (from-to)487-499
Number of pages13
JournalPublications of the Astronomical Society of Japan
Issue number2
StatePublished - Apr 25 2010
Externally publishedYes


  • Gamma rays: Bursts
  • Gamma rays: observations
  • Radiation mechanisms: non-thermal

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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