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Gamma-ray Bursts: 15 Years of GRB Afterglows最新文献

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IMPLICATIONS OF EARLY TIME OBSERVATIONS OF OPTICAL AFTERGLOWS OF GRBS GRBS光学余辉早期观测的意义
Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-07-01 DOI: 10.1051/EAS/1361030
S. Pandey, W. Zheng
{"title":"IMPLICATIONS OF EARLY TIME OBSERVATIONS OF OPTICAL AFTERGLOWS OF GRBS","authors":"S. Pandey, W. Zheng","doi":"10.1051/EAS/1361030","DOIUrl":"https://doi.org/10.1051/EAS/1361030","url":null,"abstract":"Optical observations of afterglows at very times are very useful towards understanding the least known problem of GRB research field i.e. the transition from prompt emission to early afterglows. The comparison of a subset of well-monitored GRBs and their early time properties at optical are compared with that seen at XRT and BAT wavelengths. In most of the observed cases, the very early optical observations of GRBs do not trace the canonical decay nature seen at XRT wavelengths, suggesting different origins for the observed early emissions in the two bands. In some of the early optical light-curves, the decay followed by smooth rise features are consistent with the onset of the afterglow although such features are also expected if the emission is seen off-axis and/or the outflow is structured.","PeriodicalId":335082,"journal":{"name":"Gamma-ray Bursts: 15 Years of GRB Afterglows","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114352179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
MAGNETIC FIELD AMPLIFICATION AND SATURATION BY TURBULENCE IN A RELATIVISTIC SHOCK PR 相对论激波中湍流对磁场的放大和饱和
Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-07-01 DOI: 10.1051/EAS/1361025
Y. Mizuno, M. Pohl, J. Niemiec, Bing Zhang, K. Nishikawa, P. Hardee
{"title":"MAGNETIC FIELD AMPLIFICATION AND SATURATION BY TURBULENCE IN A RELATIVISTIC SHOCK PR","authors":"Y. Mizuno, M. Pohl, J. Niemiec, Bing Zhang, K. Nishikawa, P. Hardee","doi":"10.1051/EAS/1361025","DOIUrl":"https://doi.org/10.1051/EAS/1361025","url":null,"abstract":"We perform two-dimensional relativistic magnetohydrodynamic simulations of a mildly relativistic shock propagating through an inhomogeneous medium. Simulation results show that the postshock region becomes turbulent owing to preshock density inhomogeneity, and the magnetic field is strongly amplified due to the stretching and folding of field lines in the turbulent velocity field. The amplified magnetic field evolves into a filamentary structure in two-dimensional simulations. The magnetic energy spectrum is flatter than the Kolmogorov spectrum and indicates that the so-called small-scale dynamo is occurring in the postshock region.","PeriodicalId":335082,"journal":{"name":"Gamma-ray Bursts: 15 Years of GRB Afterglows","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131934166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DESIGN, CONSTRUCTION AND PERFORMANCE OF THE DETECTOR FOR UFFO BURST ALERT & TRIGGER TELESCOPE uffo突发预警触发望远镜探测器的设计、构造与性能
Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-07-01 DOI: 10.1051/EAS/1361085
J. Lee, S. Jeong, Jieun Kim, Y. W. Kim, G. Na, J. Suh, M. Kim, H. Lim, I. Park, J. Řípa, J. Choi, Sug-Whan Kim, Yong-Jin Choi, K. Min, Pisin Chen, J. J. Huang, T. Liu, J. Nam, Meng Wang, M. Huang, P. Connell, C. Eyles, V. Reglero, J. Rodrigo, A. Castro-Tirado
{"title":"DESIGN, CONSTRUCTION AND PERFORMANCE OF THE DETECTOR FOR UFFO BURST ALERT & TRIGGER TELESCOPE","authors":"J. Lee, S. Jeong, Jieun Kim, Y. W. Kim, G. Na, J. Suh, M. Kim, H. Lim, I. Park, J. Řípa, J. Choi, Sug-Whan Kim, Yong-Jin Choi, K. Min, Pisin Chen, J. J. Huang, T. Liu, J. Nam, Meng Wang, M. Huang, P. Connell, C. Eyles, V. Reglero, J. Rodrigo, A. Castro-Tirado","doi":"10.1051/EAS/1361085","DOIUrl":"https://doi.org/10.1051/EAS/1361085","url":null,"abstract":"One of the key aspects of the upcoming Ultra-Fast Flash Observatory (UFFO) pathfinder for Gamma Ray Bursts (GRBs) identification is the UFFO Burst Alert & Trigger Telescope (UBAT). The scientific propose of UBAT is to detect and locate as fast as possible the GRBs in the sky. This is achieved by using a coded mask aperture camera scheme with a wide field of view (FOV) and selecting a X-ray detector of high quantum efficiency and large detection area. This X-ray detector of high quantum efficiency and large detection area is called the UBAT detector. The UBAT detector consists of 48 × 48 Yttrium Oxyorthosilicate (YSO) scintillator crystal arrays and Multi Anode Photomultiplier Tubes (MAPMTs), analog electronics equipped with ASIC chips, digital electronics equipped with Field Programmable Gate Array (FPGA) chips, and a mechanical structure that supports all components of the UBAT detector. The total number of the pixels in the UBAT detector is 2304, and the total effective detection area is 191 cm2 . We will present the design and construction, and performance of the UBAT detector including the responses of the UBAT detector to X-ray sources.","PeriodicalId":335082,"journal":{"name":"Gamma-ray Bursts: 15 Years of GRB Afterglows","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134335331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
THE HISTORY OF BATSE 基地的历史
Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-07-01 DOI: 10.1051/EAS/1361001
G. Fishman
{"title":"THE HISTORY OF BATSE","authors":"G. Fishman","doi":"10.1051/EAS/1361001","DOIUrl":"https://doi.org/10.1051/EAS/1361001","url":null,"abstract":"The BATSE experiment on the Compton Gamma-ray Observatory was the first large detector system designed for the study of gamma-ray bursts. The eight large-area detectors allowed full-sky coverage and were optimized to operate in the primary energy region of emission of most GRBs. BATSE provided detailed observations of the temporal and spectral characteristics of several thousand GRBs, and it was the first experiment to provide rapid notifications of the coarse location of many them. It also provided strong evidence for the cosmological distances to GRBs through the observation of the sky distribution and intensity distribution of numerous GRBs. The large number of GRBs observed with the high- sensitivity BATSE detectors continues to provide a database of GRB spectral and temporal properties in the primary energy range of GRB emission that will likely not be exceeded for at least another decade. The origin and development of the BATSE experiment, some highlights from the mission and its continuing legacy are described in this paper.","PeriodicalId":335082,"journal":{"name":"Gamma-ray Bursts: 15 Years of GRB Afterglows","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128242933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
THE CIRCUMSTELLAR MEDIUM SURROUNDING ROTATING MASSIVE STARS AS GRB PRECURSORS 环绕旋转大质量恒星的星周介质，作为伽马射线暴的前体
Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-07-01 DOI: 10.1051/EAS/1361059
B. Pérez-Rendón, J. Higuera, G. García-Segura, A. Santillán, L. Hernández-Cervantes
{"title":"THE CIRCUMSTELLAR MEDIUM SURROUNDING ROTATING MASSIVE STARS AS GRB PRECURSORS","authors":"B. Pérez-Rendón, J. Higuera, G. García-Segura, A. Santillán, L. Hernández-Cervantes","doi":"10.1051/EAS/1361059","DOIUrl":"https://doi.org/10.1051/EAS/1361059","url":null,"abstract":"Long duration Gamma Ray Bursts (LGRB) are thought to originate from massive rotating stars and the interaction of their expanding jet will be affected by the structure of their circumburst medium. In this work we use rotating stellar models of massive stars to determine the state of circumbust material in various types of progenitor scenarios and we describe how this external matter can appear in GRB observations.","PeriodicalId":335082,"journal":{"name":"Gamma-ray Bursts: 15 Years of GRB Afterglows","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129125357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ON THE PROPERTIES OF SPECTRAL LAGS AND PEAK-COUNT RATES OF RHESSI GAMMA-RAY BURSTS ressi伽玛暴的光谱滞后和峰值计数率的性质
Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-07-01 DOI: 10.1051/EAS/1361011
J. Řípa, A. Mészáros, P. Veres, I. Park
{"title":"ON THE PROPERTIES OF SPECTRAL LAGS AND PEAK-COUNT RATES OF RHESSI GAMMA-RAY BURSTS","authors":"J. Řípa, A. Mészáros, P. Veres, I. Park","doi":"10.1051/EAS/1361011","DOIUrl":"https://doi.org/10.1051/EAS/1361011","url":null,"abstract":"A sample of 427 gamma-ray bursts (GRBs) was observed by the RHESSI satellite in Feb. 2002 - Apr. 2008. We calculated spectral lags and peak-count rates for the first time and constructed a new observational database. This database is statistically studied completing an earlier analysis of durations and hardness ratios. First, we discuss properties of short-, intermediate-, and long-duration GRBs in terms of peak-count rates and spectral lags. Second, we investigate the number of GRB groups using model-based clustering method together with Kolmogorov-Smirnov (K-S) and Anderson-Darling (A-D) tests. The results are: The inter. bursts have properties similar to short bursts. The groups of inter. and long bursts appear to be different. The inter. GRBs in the RHESSI and Swift databases seem to be different phenomena. This work is summary of Řipa et al. ().","PeriodicalId":335082,"journal":{"name":"Gamma-ray Bursts: 15 Years of GRB Afterglows","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130586050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
COLOR INDICES OF OPTICAL AFTERGLOWS OF LONG GRBS IN THE SWIFT ERA 快速时代长GRBS光余辉的色指数
Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-07-01 DOI: 10.1051/EAS/1361043
V. Šimon, G. Pizzichini, R. Hudec
{"title":"COLOR INDICES OF OPTICAL AFTERGLOWS OF LONG GRBS IN THE SWIFT ERA","authors":"V. Šimon, G. Pizzichini, R. Hudec","doi":"10.1051/EAS/1361043","DOIUrl":"https://doi.org/10.1051/EAS/1361043","url":null,"abstract":"We show the power of the method of the color indices that uses the commonly available multiband photometry of optical afterglows (OAs) of long GRBs detected by Swift . Our study shows that for most OAs, in the observer frame, these colors, corrected for the Galactic reddening, display prominent clustering in the color-color diagrams. The color indices enable us to distinguish OAs from other types of objects even without available gamma-ray emission. The color-color diagrams can be used to assess the extinction inside the host galaxy. Our approach is also generally important for investigating the numerous faint OAs for which obtaining spectra with good S/N ratio is often impossible.","PeriodicalId":335082,"journal":{"name":"Gamma-ray Bursts: 15 Years of GRB Afterglows","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131179027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
VLT/X-SHOOTER ABSORPTION SPECTROSCOPY OF THE GRB 120327A AFTERGLOW GRB 120327a余辉的Vlt / x射手吸收光谱
Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-07-01 DOI: 10.1051/EAS/1361037
V. D’Elia
{"title":"VLT/X-SHOOTER ABSORPTION SPECTROSCOPY OF THE GRB 120327A AFTERGLOW","authors":"V. D’Elia","doi":"10.1051/EAS/1361037","DOIUrl":"https://doi.org/10.1051/EAS/1361037","url":null,"abstract":"We analyze two X-shooter spectra of the GRB 120327A afterglow, acquired    2.1 and    30 hrs after the trigger. The ISM in the GRB host galaxy at z  = 2.8145 is extremely rich in absorption features, with three components contributing to the line profiles. The hydrogen column density associated with GRB 120327A is log N HI  / cm2  = 22.01 ± 0.09, and the metallicity of the host galaxy is in the range [X/H] =  − 1.7 to  − 1 with respect to the solar values, i.e. , a typical value for a GRB host galaxy. In addition to the ground state lines, we detect in the first observation several excited absorption features, which disappeared in the second observation. Using these features, we derive that component I is at dI = 200+100 -60 pc from the GRB, while component II is located closer, at dII = 100+40 30 pc. These values are among the lowest found in GRBs. Comparing the abundances with star formation history models, we find that the GRB 120327A host galaxy abundances are compatible with a star formation efficiency of 10 Gyr-1 , typical of spheroids (elliptical or bulge).","PeriodicalId":335082,"journal":{"name":"Gamma-ray Bursts: 15 Years of GRB Afterglows","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127152429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
RADIATIVE MECHANISMS IN GRB PROMPT EMISSION 伽马射线暴促使发射的辐射机制
Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-05-17 DOI: 10.1051/eas/1361016
A. Pe’er
{"title":"RADIATIVE MECHANISMS IN GRB PROMPT EMISSION","authors":"A. Pe’er","doi":"10.1051/eas/1361016","DOIUrl":"https://doi.org/10.1051/eas/1361016","url":null,"abstract":"Motivated by the Fermi gamma-ray space telescope results, in recent years immense efforts were given to understanding the mechanism that leads to the prompt emission observed. The failure of the optically thin emission models (synchrotron and synchrotron self Compton) increased interest in alternative models. Optically thick models, while having several advantages, also face difficulty in capturing several key observables. Theoretical efforts are focused in two main directions: (1) mechanisms that act to broaden the Planck spectrum; and (2) combining the optically thin and optically thick models to a hybrid model that could explain the key observables.","PeriodicalId":335082,"journal":{"name":"Gamma-ray Bursts: 15 Years of GRB Afterglows","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116067849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
RADIATION FROM ACCELERATED PARTICLES IN RELATIVISTIC JETS WITH SHOCKS, SHEAR-FLOW, AND RECONNECTION 相对论射流中加速粒子的辐射与激波、剪切流和重连
Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-03-11 DOI: 10.1051/eas/1361026
K. Nishikawa, P. Hardee, Y. Mizuno, I. Duţan, Bing Zhang, M. Medvedev, E. Choi, Kyoung-Wook Min, J. Niemiec, Åke Nordlund, J. Frederiksen, H. Sol, Martin Pohl, D. H. Hartmann, A. Marscher, José L. Gómez
{"title":"RADIATION FROM ACCELERATED PARTICLES IN RELATIVISTIC JETS WITH SHOCKS, SHEAR-FLOW, AND RECONNECTION","authors":"K. Nishikawa, P. Hardee, Y. Mizuno, I. Duţan, Bing Zhang, M. Medvedev, E. Choi, Kyoung-Wook Min, J. Niemiec, Åke Nordlund, J. Frederiksen, H. Sol, Martin Pohl, D. H. Hartmann, A. Marscher, José L. Gómez","doi":"10.1051/eas/1361026","DOIUrl":"https://doi.org/10.1051/eas/1361026","url":null,"abstract":"We have investigated particle acceleration and shock structure associated with an unmagnetized relativistic jet propagating into an unmagnetized plasma for electron-positron and electron-ion plasmas. Strong magnetic fields generated in the trailing jet shock lead to transverse deflection and acceleration of the electrons. We have self-consistently calculated the radiation from the electrons accelerated in the turbulent magnetic fields for different jet Lorentz factors. We find that the synthetic spectra depend on the bulk Lorentz factor of the jet, the jet temperature, and the strength of the magnetic fields generated in the shock. We have investigated the generation of magnetic fields associated with velocity shear between an unmagnetized relativistic (core) jet and an unmagnetized sheath plasma. We discuss particle acceleration in collimation shocks for AGN jets formed by relativistic MHD simulations. Our calculated spectra should lead to a better understanding of the complex time evolution and/or spectral structure from gamma-ray bursts, relativistic jets, and supernova remnants.","PeriodicalId":335082,"journal":{"name":"Gamma-ray Bursts: 15 Years of GRB Afterglows","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121132627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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