The Low-Luminosity Afterglow Gamma-ray Bursts

Abstract

The Low Luminosity Afterglow (LLA) gamma-ray bursts (GRBs) are characterized by their very intrinsically faint X-ray afterglows. They represent 12% of the long (of duration more than 2s) GRBs (lGRBs) with measured redshift. They are on average closer than the other IGRBs and their distribution is not affected by the gas and dust from our and host galaxies, and we detect jet breaks in some cases. We explore the environments of the LLA GRBs in the light of the closure relations, both in the X-ray and in the optical bands. We have also studied the host galaxy environment. We show that the prompt properties of LLA GRBs are somewhat different from that of other lGRBs, as shown by their position in the Amati relation. We have computed the volume density of LLA GRBs. Finally, using all these information we purpose an assumption that may be applicable about the origin of GRBs.

Keywords

• X-rays
• gamma-ray bursts
• compact objects

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