文章基本信息

标题：Unveiling long lasting central engine activity with Optical-NIR afterglows
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作者：M. Nardini
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2012
卷号：2012
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：In the standard view describing the nature of long GRB emission, the duration of the centralengine activity has been usually considered to be much shorter that the afterglow emission variability time-scales. The discussion on the nature of X-ray flares and the recent studies on pre- and post-cursor emission observed in the gamma rays unveiled the possibility that the central-engine can be characterised by a much longer activity. In this work we discuss the signatures of late-time central-engine activity from a different perspective, i.e., in the temporal and spectral variability of the optical-NIR afterglow. We will discuss these signatures of the long-lasting central-engine activity unveiled thanks to the rich multicolour light curves obtained by the GROND instrument.