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Paper: The Short/Hard GRB020531 and the X-Ray Flash XRF010213: Do They Have the Same Spectral Parameters
Volume: 312, Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era
Page: 130
Authors: Sakamoto, T.; Graziani, C.; Barraud, C.; Kawai, N.; Yoshida, A.; Shirasaki, Y.; Tamagawa, T.; Torii, K.; Matsuoka, M.; Fenimore, E.E.; Galassi, M.; Tavenner, T.; Lamb, D.Q.; Donaghy, T.; Boer, M.; Dezalay, J.-P.; Olive, J.-F.; Atteia, J.-L.; Hurley, K.; Butler, N.; Vanderspek, R.; Ricker, G.R.; HETE-2 Science Team
Abstract: A short (T50 = 350 ms, 80-300 keV) and hard (photon index of ~ 1, Ep ~ 400 keV) GRB020531 was detected by the HETE — 2 French Gamma Telescope (FREGATE) and the Wide-field X-ray Monitor WXM instruments. Spectral softening is seen in this burst and this property is similar to that of long GRBs.

XRF010213 is the brightest X-ray flash (XRF) event detected by HETE — 2. There are two peaks in the WXM 2-18 keV light curve. The time average spectral analysis yields Ep for this burst of ~ 3 keV.

According to this detailed spectral study, these two extremely different GRBs show spectral parameters and characteristics similar to that of the long bursts. This conclusion suggests that both short/hard GRBs and XRFs are closely related to the long bursts.

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