A Novel Paradigm For Short Gamma-Ray Bursts With Extended X-Ray Emission

Rezzolla, Luciano
Kumar, Pawan
Journal Title
Journal ISSN
Volume Title

The merger of a binary of neutron stars provides natural explanations for many of the features of short gamma-ray bursts (SGRBs), such as the generation of a hot torus orbiting a rapidly rotating black hole, which can then build a magnetic jet and provide the energy reservoir to launch a relativistic outflow. However, this scenario has problems explaining the recently discovered long-term and sustained X-ray emission associated with the afterglows of a subclass of SGRBs. We propose a new model that explains how an X-ray afterglow can be sustained by the product of the merger and how the X-ray emission is produced before the corresponding emission in the gamma-band, though it is observed to follow it. Overall, our paradigm combines in a novel manner a number of well-established features of the emission in SGRBs and results from simulations. Because it involves the propagation of an ultra-relativistic outflow and its interaction with a confining medium, the paradigm also highlights a unifying phenomenology between short and long GRBs.

Rezzolla, Luciano, and Pawan Kumar. "A Novel Paradigm for Short Gamma-Ray Bursts With Extended X-Ray Emission." The Astrophysical Journal, Vol. 802, No. 2 (Mar., 2015): 95.