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In this paper, we have measured the prompt emitting regions of 44 low-luminosity and 14 short gamma-ray bursts (GRBs). According to our analysis we suspect that the short GRBs may arise from a smaller radius region based on the typical internal shock model, while the low-luminosity GRBs could be produced by the external shocks, the turbulences or the electromagnetic materials.
We have been designing a polarimeter for gamma-ray bursts (GRBs) sensitive to the energy range from 60 keV to 300 keV. It is a Compton-scattering-type polarimeter and it consists of four modules. The field of view for one module is ??45??. To estimate the performance, it is important to investigate the response for the irradiation from off-axis. So we had basic experiments with polarized beam and...
The Swift gamma-ray burst explorer is a NASA mid-sized explorer (MIDEX) with the primary mission of determining the origins of gamma-ray bursts (GRBs). It is the first mission to autonomously respond to newly-discovered GRBs and provide immediate follow-up with narrow field instruments capable of multiwavelength (UV, optical, X-ray) observations. The characteristics of GRBs that are the key mission...
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