HETE‐2 Observation of the Extremely Soft X‐Ray Flashes, XRF010213 and XRF020903
/ Authors
T. Sakamoto, D. Lamb, C. Graziani, T. Donaghy, M. Suzuki, G. Ricker, J. Atteia, N. Kawai, A. Yoshida, Y. Shirasaki
and 29 more authors
T. Tamagawa, K. Torii, M. Matsuoka, E. Fenimore, M. Galassi, T. Tavenner, J. Doty, R. Vanderspek, G. Crew, J. Villasenor, N. Butler, G. Prigozhin, J. Jernigan, C. Barraud, M. Boer, J. Dezalay, J. Olive, K. Hurley, A. Levine, G. Monnelly, F. Martel, E. Morgan, S. Woosley, T. Cline, J. Braga, R. Manchanda, G. Pizzichini, K. Takagishi, M. Yamauchi
/ Abstract
We report HETE‐2 WXM and FREGATE observations of two X‐ray flashes (XRFs), XRF010213 and XRF020903. The signal is only seen in 10 seconds, and this feature is similar to that of the “long” GRBs. According to the time‐averaged spectral analysis using both WXM and FREGATE data, the fluence ratio of 2–30 keV to 30–400 keV energy band is 11.4 and 5.6 for XRF010213 and XRF020903 respectively. The Epeak energy in the Band function is < 10 keV. They are likely to belong to the same class as the X‐ray flash events detected with GINGA and BeppoSAX. In this paper, we will present the detail study of the prompt emission of XRF010213 and XRF020903, and compare with the characteristics of classic GRBs.
DOI: 10.1063/1.1810811