Anastasia Tsvetkova, Lorenzo Amati, Mattia Bulla, Luciano Burderi, Dmitry Frederiks, Filippo Frontera, Cristiano Guidorzi, Alessandro Riggio, Tiziana di Salvo, Andrea Sanna, Fyodor Sviridov
{"title":"伽玛暴的分类:在休息帧的光谱峰能量持续平面上寻找第三类","authors":"Anastasia Tsvetkova, Lorenzo Amati, Mattia Bulla, Luciano Burderi, Dmitry Frederiks, Filippo Frontera, Cristiano Guidorzi, Alessandro Riggio, Tiziana di Salvo, Andrea Sanna, Fyodor Sviridov","doi":"10.1051/0004-6361/202452673","DOIUrl":null,"url":null,"abstract":"<i>Context.<i/> Two classes of gamma-ray bursts (GRBs) corresponding to the short-hard and the long-soft events, with a putative intermediate class, are typically considered in the observer frame. However, when considering GRB characteristics in the cosmological rest frame, the boundary between the classes becomes blurred.<i>Aims.<i/> The goal of this research is to check for evidences of a third ‘intermediate’ class of GRBs and investigate how the transformation from the observer to the rest frame affects the hardness-duration-based classification.<i>Methods.<i/> We applied fits with skewed and non-skewed (symmetric) Gaussian and Student distributions to a sample of 409 GRBs with reliably measured redshifts to cluster the bursts on the hardness (<i>E<i/><sub>p<sub/>) – duration (<i>T<i/><sub>90<sub/>) plane.<i>Results.<i/> We find that based on AIC/BIC criteria, the statistically preferred number of clusters on the GRB rest-frame hardness-duration plane does not exceed two. We also assessed the robustness of the clustering technique.<i>Conclusions.<i/> We did not find any solid evidence of an intermediate GRB class on the rest-frame hardness-duration plane.","PeriodicalId":8571,"journal":{"name":"Astronomy & Astrophysics","volume":"6 1","pages":"A169"},"PeriodicalIF":5.8000,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Gamma-ray burst taxonomy: Looking for the third class on the spectral peak energy-duration plane in the rest frame\",\"authors\":\"Anastasia Tsvetkova, Lorenzo Amati, Mattia Bulla, Luciano Burderi, Dmitry Frederiks, Filippo Frontera, Cristiano Guidorzi, Alessandro Riggio, Tiziana di Salvo, Andrea Sanna, Fyodor Sviridov\",\"doi\":\"10.1051/0004-6361/202452673\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<i>Context.<i/> Two classes of gamma-ray bursts (GRBs) corresponding to the short-hard and the long-soft events, with a putative intermediate class, are typically considered in the observer frame. However, when considering GRB characteristics in the cosmological rest frame, the boundary between the classes becomes blurred.<i>Aims.<i/> The goal of this research is to check for evidences of a third ‘intermediate’ class of GRBs and investigate how the transformation from the observer to the rest frame affects the hardness-duration-based classification.<i>Methods.<i/> We applied fits with skewed and non-skewed (symmetric) Gaussian and Student distributions to a sample of 409 GRBs with reliably measured redshifts to cluster the bursts on the hardness (<i>E<i/><sub>p<sub/>) – duration (<i>T<i/><sub>90<sub/>) plane.<i>Results.<i/> We find that based on AIC/BIC criteria, the statistically preferred number of clusters on the GRB rest-frame hardness-duration plane does not exceed two. We also assessed the robustness of the clustering technique.<i>Conclusions.<i/> We did not find any solid evidence of an intermediate GRB class on the rest-frame hardness-duration plane.\",\"PeriodicalId\":8571,\"journal\":{\"name\":\"Astronomy & Astrophysics\",\"volume\":\"6 1\",\"pages\":\"A169\"},\"PeriodicalIF\":5.8000,\"publicationDate\":\"2025-06-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Astronomy & Astrophysics\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1051/0004-6361/202452673\",\"RegionNum\":2,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astronomy & Astrophysics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1051/0004-6361/202452673","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
Gamma-ray burst taxonomy: Looking for the third class on the spectral peak energy-duration plane in the rest frame
Context. Two classes of gamma-ray bursts (GRBs) corresponding to the short-hard and the long-soft events, with a putative intermediate class, are typically considered in the observer frame. However, when considering GRB characteristics in the cosmological rest frame, the boundary between the classes becomes blurred.Aims. The goal of this research is to check for evidences of a third ‘intermediate’ class of GRBs and investigate how the transformation from the observer to the rest frame affects the hardness-duration-based classification.Methods. We applied fits with skewed and non-skewed (symmetric) Gaussian and Student distributions to a sample of 409 GRBs with reliably measured redshifts to cluster the bursts on the hardness (Ep) – duration (T90) plane.Results. We find that based on AIC/BIC criteria, the statistically preferred number of clusters on the GRB rest-frame hardness-duration plane does not exceed two. We also assessed the robustness of the clustering technique.Conclusions. We did not find any solid evidence of an intermediate GRB class on the rest-frame hardness-duration plane.
期刊介绍:
Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.