Bannister, Keith W. 2012 搜索到2个伽马暴的瞬时射电辐射

主要内容:
用澳大利亚的12m射电望远镜，分别是GRB 100704A和GRB 101011A。不过也有不和它们成协的可能性。

那么他们的搜索应该也可以用来找孤儿余辉呀。

精彩摘抄:


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Title:		Limits on prompt, dispersed radio pulses from gamma-ray bursts
Authors:		Bannister, Keith W.; Murphy, Tara; Gaensler, Bryan M.; Reynolds, John E.
Publication:		eprint arXiv:1207.6399
Publication Date:		07/2012
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		14 pages, 8 figures, 1 table. Accepted for Apj on 26 July 2012
Bibliographic Code:		2012arXiv1207.6399B

Abstract

We have searched for prompt radio emission from nine Gamma Ray Bursts (GRBs) with a 12 m telescope at 1.4 GHz, with a time resolution of 64 us to 1 s. We detected single dispersed radio pulses with significances >6 sigma in the few minutes following two GRBs. The dispersion measures of both pulses are well in excess of the expected Galactic values, and the implied rate is incompatible with known sources of single dispersed pulses. The arrival times of both pulses also coincide with breaks in the GRB X-ray light curves. A null trial and statistical arguments rule out random fluctuations as the origin of these pulses with >95% and 97% confidence, respectively, although a simple population argument supports a GRB origin with confidence of only 2%. We caution that we cannot rule out RFI as the origin of these pulses. If the single pulses are not related to the GRBs we set an upper limit on the flux density of radio pulses emitted between 200 to 1800 s after a GRB of 1.27 w^{-1/2} Jy, where 64 us < w < 32 ms is the pulse width. We set a limit of less than 760 Jy for long timescale (>1 s) variations. These limits are some of the most constraining at high time resolution and GHz frequencies in the early stages of the GRB phenomenon.

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