PMO OpenIR
A Large Catalog of Multiwavelength GRB Afterglows. I. Color Evolution and Its Physical Implication
Li, Liang1,2,3,4,5; Wang, Yu4,6,7; Shao, Lang8,9; Wu, Xue-Feng5; Huang, Yong-Feng10,11; Zhang, Bing12; Ryde, Felix1,2; Yu, Hoi-Fung1,2
2018-02-01
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
ISSN0067-0049
Volume234Issue:2Pages:29
Abstract

The spectrum of gamma-ray burst (GRB) afterglows can be studied with color indices. Here, we present a large comprehensive catalog of 70 GRBs with multiwavelength optical transient data on which we perform a systematic study to find the temporal evolution of color indices. We categorize them into two samples based on how well the color indices are evaluated. The Golden sample includes 25 bursts mostly observed by GROND, and the Silver sample includes 45 bursts observed by other telescopes. For the Golden sample, we find that 96% of the color indices do not vary over time. However, the color indices do vary during short periods in most bursts. The observed variations are consistent with effects of (i) the cooling frequency crossing the studied energy bands in a wind medium (43%) and in a constant-density medium (30%), (ii) early dust extinction (12%), (iii) transition from reverse-shock to forward-shock emission (5%), or (iv) an emergent SN emission (10%). We also study the evolutionary properties of the mean color indices for different emission episodes. We find that 86% of the color indices in the 70 bursts show constancy between consecutive ones. The color index variations occur mainly during the late GRB-SN bump, the flare, and early reverse-shock emission components. We further perform a statistical analysis of various observational properties and model parameters (spectral index beta(CI)(o), electron spectral indices p(CI), etc.) using color indices. Overall, we conclude that similar to 90% of colors are constant in time and can be accounted for by the simplest external forward-shock model, while the varying color indices call for more detailed modeling.

Keywordmethods: statistical stars: gamma-ray burst ISM: dust, extinction
DOI10.3847/1538-4365/aaa02a
WOS KeywordGAMMA-RAY BURST ; TIME-DEPENDENT PHOTOIONIZATION ; SWIFT PANCHROMATIC OBSERVATIONS ; HIGH-RESOLUTION SPECTROSCOPY ; EARLY OPTICAL AFTERGLOWS ; X-RAY ; HOST-GALAXY ; LIGHT CURVES ; PROMPT EMISSION ; DUSTY MEDIUM
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000424013500003
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22218
Collection中国科学院紫金山天文台
Corresponding AuthorLi, Liang
Affiliation1.KTH Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden
2.AlbaNova, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden
3.Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden
4.ICRANet, Piazza Repubbl 10, I-65122 Pescara, Italy
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
6.Sapienza Univ Roma, Dip Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy
7.Sapienza Univ Roma, ICRA, Piazzale Aldo Moro 5, I-00185 Rome, Italy
8.Hebei Normal Univ, Dept Space Sci & Astron, Shijiazhuang 050024, Hebei, Peoples R China
9.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
10.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China
11.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
12.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
Recommended Citation
GB/T 7714
Li, Liang,Wang, Yu,Shao, Lang,et al. A Large Catalog of Multiwavelength GRB Afterglows. I. Color Evolution and Its Physical Implication[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2018,234(2):29.
APA Li, Liang.,Wang, Yu.,Shao, Lang.,Wu, Xue-Feng.,Huang, Yong-Feng.,...&Yu, Hoi-Fung.(2018).A Large Catalog of Multiwavelength GRB Afterglows. I. Color Evolution and Its Physical Implication.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,234(2),29.
MLA Li, Liang,et al."A Large Catalog of Multiwavelength GRB Afterglows. I. Color Evolution and Its Physical Implication".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 234.2(2018):29.
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