The Central Engine of GRB 130831A and the Energy Breakdown of a Relativistic Explosion
作者： M. De Pasquale , S. R. Oates , J. L. Racusin , D. A. Kann , B. Zhang
关键词: Astrophysics 、 Supernova 、 Afterglow 、 Reionization 、 Gamma-ray burst 、 Energy source 、 Magnetar 、 Nordic Optical Telescope 、 Astronomy 、 Light curve 、 Physics
摘要: Gamma-ray bursts (GRBs) are the most luminous explosions in Universe, yet nature and physical properties of their energy sources far from understood. Very important clues, however, can be inferred by studying afterglows these events. We present optical X-ray observations GRB 130831A obtained Swift, Chandra, Skynet, Reionization And Transients Infra-Red camera, Maidanak, International Scientific Optical-Observation Network, Nordic Optical Telescope, Liverpool Telescope Gran Telescopio Canarias. This burst shows a steep drop light curve at asymptotically equal to 10(exp 5) s after trigger, with power-law decay index alpha that is approximately 6. Such rare behaviour cannot explained standard forward shock (FS) model indicates emission, up fast s, must internal origin, produced dissipation process within an ultrarelativistic outflow. propose source such outflow, which produce flux for 1 d cosmological rest frame, newly born magnetar or black hole. After drop, faint afterglow continues much shallower decay. The on other hand, no break across decrease, late-time decays both consistent. Using data, we show emission scan well FS model. our data derive kinetic ejecta thus measure efficiency central engine origin visible long time. Furthermore, down budget this into prompt late dissipation, relativistic ejecta,and compare it associated supernova, SN 2013 fu.
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