GWTC-4.1: Parameter estimation data release

This material is part of several data products associated with GWTC-4.1, an update to the fourth Gravitational-Wave Transient Catalog from the LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration. For more information, see the GWTC-5.0 results paper (https://dcc.ligo.org/LIGO-P2600152/public), the related material linked from this page, and the GWTC-4.1 data release documentation (www.gw-openscience.org/GWTC-4.1/). Parameter estimation data release This data release contains posterior samples (*.hdf5) for gravitational-wave candidates from the first part of the fourth observing run (O4a), as well as a summary file (IGWN-GWTC4p1-18965dda8_5-PESummaryTable.hdf5) that includes a table of credible intervals for all released posterior samples. We provide results for all O4a candidates that have a false alarm rate of less than 1 per year. There is one .hdf5 file per event that contains posterior samples for all parameter estimation runs on that event, as well as mixed samples where multiple waveform models have been equally weighted (for analyses where mixed samples are applicable). In addition to containing the posterior samples, the .hdf5 files also contain metadata about the analyses, including the configuration files (which specify details such as the detector data analysed), noise power spectral densities (potentially for a superset of the detectors used in the analysis), priors, and calibration uncertainty envelopes. See the paper appendices and the provided notebook for further information. The inference of the source parameters was performed with Bilby and, in some cases, RIFT. The results are formatted using PESummary. This release is primarily composed of results from the first part of O4 (O4a). A similar release was made for the previous GWTC-3.0 catalog that contained candidates from the second part of O3 (O3b). Sky localization data release The sky localization tar file (IGWN-GWTC4p1-18965dda8_5-Archived_Skymaps.tar.gz) contains candidate sky localizations corresponding to different parameter estimation configurations (.fits). There is one .fits file per set of posterior samples. Python notebook The Python notebook (GWTC4p1_PE_data_release.ipynb) explains how to read and use the data files included in this release with a selection of examples. How to download all files from this page If you would like to download all files on this page, we recommend zenodo_get: pip install zenodo-get zenodo_get RECORD_ID_OR_DOI where the record ID for the most recent version of this page is 20275768 and IDs for other versions can be found in the Versions section at the side of this page. Additional information For more general background on gravitational-wave search analysis and sky maps, try the materials from a GW Open Data Workshop or the guide to LIGO–Virgo data analysis.本材料隶属于与GWTC-4.1相关的多款数据产品，GWTC-4.1是LIGO科学合作组（LIGO Scientific Collaboration）、Virgo合作组以及KAGRA合作组发布的第四版引力波瞬变源目录的更新版本。如需了解更多信息，请参阅GWTC-5.0结果论文（https://dcc.ligo.org/LIGO-P2600152/public）、本页面关联的相关材料，以及GWTC-4.1数据发布文档（www.gw-openscience.org/GWTC-4.1/）。 参数估计数据发布 本次数据发布包含第四次观测运行第一阶段（O4a）中引力波候选体的后验样本（*.hdf5），以及包含所有已发布后验样本可信区间表格的汇总文件（IGWN-GWTC4p1-18965dda8_5-PESummaryTable.hdf5）。本发布提供了所有虚警率低于1次/年的O4a候选体的分析结果。每个引力波事件对应一个.hdf5文件，其中包含该事件所有参数估计分析的后验样本，以及对多个波形模型进行等权重加权得到的混合样本（适用于支持混合样本的分析场景）。 除后验样本外，.hdf5文件还包含分析相关的元数据，包括配置文件（用于指定分析所用探测器数据等细节）、噪声功率谱密度（可能包含分析中使用的探测器之外的额外探测器数据）、先验分布以及校准不确定度包络。如需进一步了解详情，请参阅论文附录及配套的Python笔记本。 源参数的推断工作由Bilby完成，部分场景下使用RIFT。分析结果采用PESummary进行格式化处理。 本次发布主要包含O4第一阶段（O4a）的分析结果。此前针对GWTC-3.0目录也曾发布过类似数据产品，其中包含第三次观测运行第二阶段（O3b）的候选体分析结果。 天区定位数据发布 天区定位压缩包（IGWN-GWTC4p1-18965dda8_5-Archived_Skymaps.tar.gz）包含对应不同参数估计配置的候选天区定位结果（.fits格式）。每组后验样本对应一个.fits文件。 Python笔记本 本配套Python笔记本（GWTC4p1_PE_data_release.ipynb）将演示如何读取并使用本次发布的数据文件，并提供了相关示例。 如何下载本页面所有文件 若需下载本页面的全部文件，我们推荐使用zenodo_get工具： pip install zenodo_get zenodo-get RECORD_ID_OR_DOI 本页面最新版本的记录ID为20275768，其他版本的记录ID可在本页面侧边栏的“版本”栏目中查找。 补充信息 如需了解引力波搜索分析与天区定位图的通用背景知识，可以参考GW开放数据研讨会（GW Open Data Workshop）的相关材料，或LIGO-Virgo数据分析指南。