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Paper: X-Ray Flashes from Off-Axis Gamma-Ray Bursts
Volume: 312, Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era
Page: 385
Authors: Yamazaki, R.; Nakamura, T.; Ioka, K.
Abstract: We propose the off-axis jet model for the possible scenario of the X-ray flash (XRF). If the viewing angle is larger than the collimation angle of the GRB jet, for appropriate model parameters we obtain the observations characteristics of the XRFs, such as the peak flux ratio and the fluence ratio between the γ-ray (50-300 keV) and the X-ray band (2-10 keV), the X-ray photon index, the typical duration and the event rate ~ 100 yr−1. We also suggest that the off-axis GRB jet with small opening half-angle Δθ ≤ 0.03 can be observed as XRFs with the cosmological distance, which may account for the observed <V/Vmax> reported in this conference.
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