Galli 2008 X射线耀发和余辉阶段的高能辐射

主要内容:
以及MAGIC的探测率

精彩摘抄:


文章信息:

arXiv:0805.2884 [ps, pdf, other]

Title: Prospects for detection of very high energy emission from GRB in the context of the External Shock model

Authors: A. Galli, L. Piro (INAF/Isaf-Roma)

Comments: 5 pages, 2 color figures, submitted to A&A letters

Subjects: Astrophysics (astro-ph)

The detection of the 100 GeV-TeV emission by a Gamma-Ray Burst (GRB) will provide an unprecedented opportunity to enlighten the nature of the central engine and the interaction between the relativistic flow and the environment of the burst progenitor. In this paper we show that there are exciting prospects of detecting by MAGIC high energy (HE) emission from the burst during the "early" X-ray flaring activity and, later, during the "normal" afterglow phase. We also identify the best observational strategy (trigger conditions and time period of observation). We determine the expected HE emission from the flaring and afterglow phases of GRBs in the context of the External Shock scenario and compare them with the MAGIC threshold. We find that a X-ray flare with the average properties of the class, can be detected in the 100 GeV range by MAGIC provided that z<1.> a few cm^{-3}. In this case the MAGIC observation shall extend to about 10-20 ksec. We provide recipes to tailor this prediction to the observational properties of each burst, in particular the fluence in the prompt emission and the redshift, thus allowing an almost "real time" decision procedure to decide whether to continue the follow up observation of a burst at late times.