伽玛暴(Gamma-Ray Burst)笔记。记录有关伽玛暴的新文章,另外也包括看的老文章、自己的想法、以及跟天文相关的一些东西。 Feel free to leave me a message by comments or by email.

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星期四, 二月 05, 2009

Razzaque 2009 如果伽玛暴是超高能宇宙射线的来源

主要内容:


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文章信息:


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Title:
Observational Consequences of GRBs as Sources of Ultra High Energy Cosmic Rays
Authors:
Razzaque, Soebur; Dermer, Charles D.; Finke, Justin D.; Atoyan, Armen
Publication:
eprint arXiv:0901.4973
Publication Date:
01/2009
Origin:
ARXIV
Keywords:
Astrophysics - High Energy Astrophysical Phenomena
Comment:
6 pages and 4 figures. Contribution to the proceedings of the Huntsville GRB Symposium 2008
Bibliographic Code:
2009arXiv0901.4973R
AbstractGamma-ray bursts (GRBs) have long been considered as candidates of ultrahigh-energy cosmic rays (UHECRs). We investigate the signatures of CR proton acceleration in the GRBs by consistently taking into account their hadronic and electromagnetic interactions. We discuss the implications of our findings for high-energy gamma ray observations with the recently launched Fermi Gamma-ray Space Telescope.
Bibtex entry for this abstract Preferred format for this abstract (see Preferences)

星期日, 一月 18, 2009

Augusto 2009 和伽玛暴成协的一些GeV muon辐射

主要内容:
此文介绍了两个事例. 说在4 sigma的置信度上是存在的

奇怪的是此人有好多篇关于与伽玛暴成协的muon文章, 但是要么只在astroph上出现, 要么只在prd上出现. 没有ApJ等的文章.
如在ads上搜索的结果: results of Augusto


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文章信息:

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Title:
Search for the GeV counterparts of two gamma ray bursts: Swift 317662 and Fermi bn081017474
Authors:
Augusto, C. R. A.; Navia, C. E.; Robba, M. B.; Tsui, K. H.
Affiliation:
AA(Instituto de Física, Universidade Federal Fluminense, 24210-346, Niterói, RJ, Brazil), AB(Instituto de Física, Universidade Federal Fluminense, 24210-346, Niterói, RJ, Brazil), AC(Instituto de Física, Universidade Federal Fluminense, 24210-346, Niterói, RJ, Brazil), AD(Instituto de Física, Universidade Federal Fluminense, 24210-346, Niterói, RJ, Brazil)
Publication:
Physical Review D, vol. 78, Issue 12, id. 122001 (PhRvD Homepage)
Publication Date:
12/2008
Origin:
APS
Abstract Copyright:
(c) 2008: The American Physical Society
DOI:
10.1103/PhysRevD.78.122001
Bibliographic Code:
2008PhRvD..78l2001A

Abstract

We examine the possibility of the ground observation of the GeV counterparts of two gamma ray bursts, the Swift GRB-080723 (Trigger=317662) and the Fermi GRB081017474 (trigger=bn081017474). The data come from two small directional muon telescopes at sea level inside the South Atlantic Anomaly region. This characteristic offers the muon telescopes a low rigidity of response to primary and secondary charged particles (≥0.4GV). In both cases, the GRB trigger coordinates are within the effective field of view of the vertical Tupi muon telescopes. There is a ground level enhancement (GLE) on the muon counting rate background, with a statistical significance above 4σ, 38.22 minutes after the Swift trigger occurrence, and there are at least two GLEs, with a significance above 4σ, at 7.2 minutes and 19.2 minutes after the Fermi trigger, respectively. We argue that the GeV counterpart of a keV GRB could be similar to the highest GRBs, observed by EGRET within BATSE’s field of view, where the high-energy emission arrives at the detector in fragments, and they are delayed and/or anticipated with respect to the keV-MeV burst. This behavior is observed in both cases. In short, the analysis suggests that they may be physically associated. Details and some implications of this possible association are reported in this work.

星期六, 七月 26, 2008

Gendre 2008 伽玛暴和粒子天体物理

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文章信息:

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Title:
Gamma-Ray Bursts and Particle Astrophysics
Authors:
Gendre, B.
Publication:
eprint arXiv:0807.3918
Publication Date:
07/2008
Origin:
ARXIV
Keywords:
Astrophysics
Comment:
8 pages, 5 figures, proceeding of the XXth rencontres de Blois, may 2008
Bibliographic Code:
2008arXiv0807.3918G

Abstract

Gamma-ray bursts are violent events occurring randomly in the sky. In this review, I will present the fireball model, proposed to explain the phenomenon of gamma-ray bursts. This model has important consequences for the production and observation at Earth of gravitational waves, high energy neutrinos, cosmic rays and high energy photons, and the second part of this review will be focused on these aspects. A last section will briefly discuss the topic of the use of gamma-ray bursts as standard candles and possible cosmological studies.
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星期四, 十一月 15, 2007

Wang 2007 GRB for UHE cosmic rays

主要内容:


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文章信息:

arXiv:0711.2065 [ps, pdf, other]
Title: On the Origin and Survival of UHE Cosmic-Ray Nuclei in GRBs and Hypernovae
Subjects: Astrophysics (astro-ph)

The chemical composition of the ultra-high-energy (UHE) cosmic rays serves as an important clue for their origin. Recent measurements of the elongation rates by the Pierre Auger Observatory hint at the possible presence of heavy or intermediate mass nuclei in the UHE cosmic rays. Gamma-ray bursts (GRBs) and hypernovae have been suggested as possible sources of the UHE cosmic rays. Here we derive the constraints on the physical conditions under which UHE heavy nuclei, if they are accelerated in these sources, can survive in their intense photon fields. We find that in the GRB external shock and in the hypernova scenarios, UHE nuclei can easily survive photo-disintegration. In the GRB internal shock scenario, UHE nuclei can also survive, provided the dissipation radius and/or the bulk Lorentz factor of the relativistic outflow are relatively large, or if the low-energy self-absorption break in the photon spectrum of the prompt emission occurs above several KeV. In internal shocks and in the other scenarios, intermediate-mass UHE nuclei have a higher probability of survival against photo-disintegration than UHE heavy nuclei such as Fe.

星期一, 七月 09, 2007

Murase 2007 早期余辉阶段的高能中微子

主要内容:
考虑各种模型在早期余辉阶段的高能中微子辐射,以及探测到的可能性。认为正反激波不能产生。

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文章信息:

arXiv:0707.1140 [ps, pdf, other]
Title: High energy neutrino early afterglows gamma-ray bursts revisited
Authors: Kohta Murase
Comments: 17 pages, 11 figures
Subjects: Astrophysics (astro-ph)

High energy neutrino emission from gamma-ray bursts (GRBs) has been expected in various scenarios. In this paper, we study neutrino emission under the various models for early afterglows of GRBs, and discuss implications for neutrino signals from recent Swift observations. Future neutrino detectors such as IceCube might detect neutrino signals from early afterglows under the late prompt emission model, but it would be difficult under the reverse-forward shock model. Neutrino-detections are inviting because they could provide us with not only information on baryon acceleration but also one of the clues to the model of early afterglows. They also lead to motivating neutrino telescopes that are larger than IceCube. Finally, we compare various predictions for the neutrino background from GRBs.

星期一, 五月 21, 2007

Asano 2007 暴本身高能光子、mu介子和正负电子对

主要内容:
在内激波的框架下,蒙特卡罗模拟GeV-TeV 的高能辐射。

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文章信息:
arXiv:0705.2910 [ps, pdf, other] : Title: Prompt GeV-TeV Emission of Gamma-Ray Bursts Due to High-Energy Protons, Muons and Electron-Positron Pairs
Authors: Katsuaki Asano, Susumu Inoue
Comments: 11 pages, 8 figures and 14 appendix figures

In the framework of the internal shock scenario, we model the broadband prompt emission of gamma-ray bursts (GRBs) with emphasis on the GeV-TeV bands, utilizing Monte Carlo simulations that include various processes associated with electrons and protons accelerated to high energies. While inverse Compton emission from primary electrons is often dominant, different proton-induced mechanisms can also give rise to distinct high-energy components, such as synchrotron emission from protons, muons or secondary electron-positron pairs injected via photomeson interactions. In some cases, they give rise to double spectral breaks that can serve as unique signatures of ultra-high-energy protons. We discuss the conditions favorable for such emission, and how they are related to the production of ultra-high-energy cosmic rays and neutrinos in internal shocks. Ongoing and upcoming observations by {\it GLAST}, atmospheric Cerenkov telescopes and other facilities will test these expectations and provide important information on the physical conditions in GRB outflows.

星期三, 五月 09, 2007

Achterberg 2007 AMANDA的中微子观测

主要内容:
观测1997 到 2003年的伽玛暴对应的中微子辐射,只给出了上限:E^2{\Phi}_{\nu} {\leq} 6.0 \times 10^{-9} GeV cm^{-2} s^{-1} sr^{-1}

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文章信息:
The Search for Muon Neutrinos from Northern Hemisphere Gamma-Ray Bursts with AMANDA

Abstract: We present the results of the analysis of neutrino observations by the Antarctic Muon and Neutrino Detector Array (AMANDA) correlated with photon observations of more than 400 gamma-ray bursts (GRBs) in the Northern Hemisphere from 1997 to 2003. During this time period, AMANDA's effective collection area for muon neutrinos was larger than that of any other existing detector. Based on our observations of zero neutrinos during and immediately prior to the GRBs in the dataset, we set the most stringent upper limit on muon neutrino emission correlated with gamma-ray bursts. Assuming a Waxman-Bahcall spectrum and incorporating all systematic uncertainties, our flux upper limit has a normalization at 1 PeV of
E^2{\Phi}_{\nu} {\leq} 6.0 \times 10^{-9} GeV cm^{-2} s^{-1} sr^{-1}, with 90% of the events expected within the energy range of ~10 TeV to ~3 PeV. The impact of this limit on several theoretical models of GRBs is discussed, as well as the future potential for detection of GRBs by next generation neutrino telescopes. Finally, we briefly describe several modifications to this analysis in order to apply it to other types of transient point sources.
Comments:
44 pages, 10 figures; submitted to Astrophysical Journal
Subjects:
Astrophysics (astro-ph)
Cite as:

星期日, 五月 06, 2007

Waxman 2007 超高能非电磁辐射

主要内容:
一个展望。

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文章信息:
Non-photonic emission from gamma-ray bursts

Authors: E. Waxman
Abstract: gamma-ray bursts (GRBs) are likely sources of ultra-high energy, >10^{19} eV, protons and high energy, >1 TeV, neutrinos. Large volume detectors of ultra high energy cosmic rays (UHECRs) and high energy neutrinos, which are already operating and are being expanded, may allow to test in the coming few years the predictions of the GRB model for high energy proton and neutrino production. Detection of the predicted signals will allow to identify the sources of UHECRs and will provide a unique probe, which may allow to resolve open questions related to the underlying physics of GRB models. Moreover, detection of GRB neutrinos will allow to test for neutrino properties (e.g., flavor oscillations for which tau's would be a unique signature, and coupling to gravity) with an accuracy many orders of magnitude better than is currently possible.
Comments:
contribution to the proc. of the Sixteenth Maryland Astrophysics Conference (was not posted earlier by mistake)
Subjects:
Astrophysics (astro-ph)
Journal reference:
AIPC 836, 589 (2006)

星期五, 五月 04, 2007

Dermer 2007 Blazar和伽玛暴的中微子和伽玛射线辐射

主要内容:
认为Blazar和伽玛暴的伽玛光子可能以中微子的形式辐射出,从而在某些情况下伽玛射线弱而中微子流量强。

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文章信息:
Correlation of Photon and Neutrino Fluxes in Blazars and Gamma Ray Bursts

Abstract: Relativistic black-hole jet sources are leading candidates for high energy (>> TeV) neutrino production. The relations defining (a) efficient photopion losses of cosmic ray protons on target photons and (b) gamma-gamma opacity of gamma rays through that same target photon field imply clear multiwavelength predictions for when and at what energies blazars and GRBs should be most neutrino bright and gamma-ray dim.
Comments:
10 pages, 1 figure, submitted to PRL
Subjects:
Astrophysics (astro-ph)

星期二, 二月 27, 2007

van Eijndhoven 2007 伽玛暴高能中微子的观测

主要内容:


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文章信息:

astro-ph/0702029 [abs, ps, pdf, other] :
Title: On the observability of high-energy neutrinos from gamma ray bursts
Authors: Nick van Eijndhoven
Comments: 8 pages, 7 figures

A method is presented for the identification of high-energy neutrinos from gamma ray bursts by means of a large-scale neutrino telescope. The procedure makes use of a time profile stacking technique of observed neutrino induced signals in correlation with satellite observations. By selecting a rather wide time window, a possible difference between the arrival times of the gamma and neutrino signals may also be identified. This might provide insight in the particle production processes at the source. By means of a toy model it will be demonstrated that a statistically significant signal can be obtained with a km^3 scale neutrino telescope on a sample of 500 gamma ray bursts for a signal rate as low as 1 detectable neutrino for 3% of the bursts.

星期一, 一月 08, 2007

Waxman 2007 伽玛暴与中微子辐射

主要内容:


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文章信息:

astro-ph/0701170 [abs, ps, pdf, other] :
Title: Neutrino astronomy and gamma-ray bursts
Authors: E. Waxman (Weizmann Inst.)
Comments: Review, R. Soc. Discussion Meeting on GRBs (To appear in Phil. Trans. R. Soc. Lond. A)

The construction of large volume detectors of high energy, >1 TeV, neutrinos is mainly driven by the search for extra-Galactic neutrino sources. The existence of such sources is implied by observations of ultra-high energy, >10^{19} eV, cosmic-rays, the origin of which is a mystery. In this lecture I briefly discuss the expected extra-Galactic neutrino signal and the current state of the experimental efforts. Neutrino emission from gamma-ray bursts (GRBs), which are likely sources of both high energy protons and neutrinos, is discussed in some detail. The detection of the predicted GRB neutrino signal, which may become possible in the coming few years, will allow one to identify the sources of ultra-high energy cosmic-rays and to resolve open questions related to the underlying physics of GRB models. Moreover, detection of GRB neutrinos will allow one to test for neutrino properties (e.g. flavor oscillations and coupling to gravity) with an accuracy many orders of magnitude better than is currently possible.


星期四, 十一月 30, 2006

Gonzalez-Garcia 2006 伽玛暴的中微子辐射限定量子引力 2

主要内容:
跟用伽玛光子一样的,也是用不同能量中微子的速度不一样来定量子引力能标下限。

(既然这样,不可以通过光子和中微子的到达时间来做吗?)


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文章信息:

hep-ph/0611359 [abs, ps, pdf, other] :
Title: Gamma Ray Burst Neutrinos Probing Quantum Gravity
Authors: M.C. Gonzalez-Garcia, F. Halzen
Comments: 14 pages, 2 figures

Very high energy, short wavelength, neutrinos may interact with the space-time foam predicted by theories of quantum gravity. They would propagate like light through a crystal lattice and be delayed, with the delay depending on the energy. This will appear to the observer as a violation of Lorenz invariance. Back of the envelope calculations imply that observations of neutrinos produced by gamma ray bursts may reach Planck-scale sensitivity. We revisit the problem considering two essential complications: the imprecise timing of the neutrinos associated with their poorly understood production mechanism in the source and the indirect nature of their energy measurement made by high energy neutrino telescopes.

星期二, 十月 17, 2006

Yüksel2006 伽玛暴和中微子背景辐射的关系 2

主要内容:
伽玛暴和中微子背景辐射的关系以及与UHECR的关系。

精彩摘抄:
observations have revealed that GRBs generally originate from metal-poor galaxies and do not directly trace cosmic star formation,

the mean redshift of the Swift GRB sample, ∼ 3.


文章信息:

astro-ph/0610481 [abs, ps, pdf, other] :
Title: Implications of a GRB-Metallicity Anti-Correlation for Cosmogenic Neutrinos
Authors: Hasan Yuksel, Matthew D. Kistler (Ohio State University)
Comments: 8 pages, 5 figures

星期三, 九月 27, 2006

Murase2006 低光度暴的高能中微子幅射 2

主要内容:
swift观测到的GRB060218显示低光度暴的爆发率可能很高. 作者认为低光度暴的高能中微子可能和高光度的差不多, 如果用中微子探测器先探测到中微子爆发, 这样可以准确地确定低光度这类暴的诞生率.

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文章信息:
astro-ph/0607104,The Astrophysical Journal, 651:L5-L8, 2006 November 1
High Energy Neutrinos and Cosmic-Rays from Low-Luminosity Gamma-Ray Bursts? Authors: Kohta Murase, Kunihito Ioka, Shigehiro Nagataki, Takashi Nakamura

星期六, 九月 02, 2006

此贴专门存放labels4

|2|4|伽玛暴其他效应|0|41|喷流结构|2|42|幅射机制|2|141|磁场及放大 |2|43|数值模拟|2|142|超高能幅射|2|46|非电磁幅射|2|47|宿主星系|2|49|观测仪器|2|7|伽玛暴应用|0|44|路上环 境|2|71|宇宙学|2|72|time lag|2|73|SFR indicator|2|100|伽玛暴综述|0|6|想法与评论|0|101|非伽玛暴|0|102|黑洞吸积盘|2|0|说明和常要访问的|0|3| 其他杂项|0