International Conference
The multi-messenger astronomy:
gamma-ray bursts, search for electromagnetic counterparts to
neutrino events and gravitational waves

7-14 October 2018

Gamma-ray Burst Optical Afterglow Long Li, Lang Xie, Jie-Wan Yang, Jing Li, Xiang-Gao Wang*, En-Wei Liang, WeiKang Zheng

Abstract

      Regardless of the progenitor and central engine, the gamma-ray burst (GRB) afterglows are produced by the synchrotron emission external forward shock. Swift and the ground-based telescopes provide a rich early afterglow data which revealed many unexpected and interesting features. Based on the statistics of a large GRB sample, this paper gives a brief introduction of the GRB optical afterglow, including observations, emission components and the afterglow puzzle "achromatic or chromatic?". The afterglows provide a very important window between the afterglows and prompt emission to reveal the veil of the progenitor, central engine, ejecta composition and radiation mechanism. GRB 140323A is a good case interpreted with circumburst medium transition from a stellar wind to a homogenous density medium in the external shock model. GRB 140419A and 150910A are good cases for a magnetar spin down to a stable neutron star and the collapse in black hole, respectively.

Reference:
Long Li, Lang Xie, Jie-Wan Yang, Jing Li, Xiang-Gao Wang*, En-Wei Liang, WeiKang Zheng. "Gamma-ray Burst Optical Afterglow", in Proceedings of the International Conference "The multi-messenger astronomy: gamma-ray bursts, search for electromagnetic counterparts to neutrino events and gravitational waves", Russia, Nizhnij Arkhyz (SAO RAS), Terskol (BNO INR RAS), October, 7 - 14, 2018, Publishing house SNEG, Pyatigorsk, 2019, ISBN 978-5-6041711-1-0, pp.118-125.
DOI: 10.26119/SAO.2019.1.35523
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