The NANOGrav 15-Year Data Set\nPublic release \"v2.1.0\" 2025/07/17\n\nOVERVIEW\n--------\n\n This file contains \"narrowband\" and \"wideband\" TOAs and timing\nsolutions for the NANOGrav 15-year data set, covering data taken from\n2004 to mid-2020 using Arecibo, the Green Bank Telescope (GBT), and the\nVery Large Array (VLA) with ASP/GASP and PUPPI/GUPPI/YUPPI backend\ninstrumentation. The observations, data reduction, and analysis\nprocedures used to produce these data are described in detail in the\naccompanying paper, \"The NANOGrav 15-year Data Set: Observations and\nTiming of 68 Millisecond Pulsars\" (Agazie et al., 2023, ApJL 951 L9,\nDOI 10.3847/2041-8213/acda9a, arXiv:2306.16217).", "funding": [ { "award": { "id": "021nxhr62::2020265", "number": "2020265", "program": "MPS/OAD", "title": { "en": "The NANOGrav Physics Frontiers Center" } }, "funder": { "id": "021nxhr62", "name": "U.S. National Science Foundation" } }, { "award": { "id": "021nxhr62::1430284", "number": "1430284", "program": "MPS/OAD", "title": { "en": "NANOGrav Physics Frontier Center" } }, "funder": { "id": "021nxhr62", "name": "U.S. National Science Foundation" } } ], "languages": [ { "id": "eng", "title": { "en": "English" } } ], "publication_date": "2025-07-17", "publisher": "Zenodo", "references": [ { "reference": "Gabriella Agazie et al 2023 ApJL 951 L9" } ], "resource_type": { "id": "dataset", "title": { "de": "Datensatz", "en": "Dataset" } }, "rights": [ { "description": { "en": "The Creative Commons Attribution license allows re-distribution and re-use of a licensed work on the condition that the creator is appropriately credited." }, "icon": "cc-by-icon", "id": "cc-by-4.0", "props": { "scheme": "spdx", "url": "https://creativecommons.org/licenses/by/4.0/legalcode" }, "title": { "en": "Creative Commons Attribution 4.0 International" } } ], "subjects": [ { "subject": "NANOGrav" }, { "subject": "Pulsar" }, { "subject": "Pulsar Timing Array" }, { "subject": "Gravitational Wave Background" } ], "title": "The NANOGrav 15-Year Data Set", "version": "2.1.0" }, "parent": { "access": { "owned_by": { "user": "466628" }, "settings": { "accept_conditions_text": null, "allow_guest_requests": false, "allow_user_requests": false, "secret_link_expiration": 0 } }, "communities": { "default": "4a252b35-79ca-40bf-829a-99148846f066", "entries": [ { "access": { "member_policy": "open", "members_visibility": "public", "record_submission_policy": "open", "review_policy": "open", "visibility": "public" }, "children": { "allow": false }, "created": "2022-12-20T19:17:27.991101+00:00", "custom_fields": {}, "deletion_status": { "is_deleted": false, "status": "P" }, "id": "4a252b35-79ca-40bf-829a-99148846f066", "links": {}, "metadata": { "curation_policy": "", "description": "Collection of Official NANOGrav-related projects posted onto Zenodo.", "page": "
\n This release is available at Zenodo (DOI 10.5281/zenodo.16051178).
You can also reference all versions (DOI 10.5281/zenodo.7967584).\n\n All *.par and *.tim files are ASCII and are formatted for use with \nstandard pulsar timing packages such as tempo2 and PINT, except for \nprofile template files which are FITS format (narrowband) or python \npickle files (wideband).
For our narrowband results, we have included ASCII space-separated
tables of our post-fit timing model residuals for all of our pulsars
(both un-whitened and whitened). These are available as both full
and epoch-averaged formats.\n\n Correlation matrix files are available in three formats (*.txt, *.npz,\nand *.hdf5). See \"description.txt\" in both the narrowband and wideband \n./correlations subdirectories for more details about these files.\n\n Questions about the contents of this data set can be addressed to Joe\nSwiggum (swiggumj@gmail.com) or comments@nanograv.org.\n\n\nDIRECTORY AND FILE STRUCTURE (FURTHER DETAILS BELOW)\n---------------------------------------------------\n\n ./README\n This file.\n ./clock\n Files for tracing observatory-measured TOAs to clock standards.\n ./narrowband\n Directory containing the narrowband data set.\n\t Details are provided in README.narrowband in that directory.\n ./wideband\n Directory containing the wideband data set.\n\t Details are provided in README.wideband in that directory.\n ./correlations\n Directory containing the correlation matrix files for both the \n narrowband and wideband data. Details are provided in the \n /wideband/ and /narrowband/ subdirectories' description.txt \n files. \n\n\nSOFTWARE\n--------\n\n This data set requires up-to-date installations of PINT or tempo2.\nOur original analysis used PINT v0.9.1 and tempo2 v2022.01.1. Up to date\nversions of these packages, as well as usage information and\ndocumentation can be found at the following repositories:\n\n PINT https://github.com/nanograv/PINT\n tempo2 https://bitbucket.org/psrsoft/tempo2\n\n Note that we do not guarantee complete/correct functionality of these\ntiming models in the older original tempo software package.\n\n Please also ensure that the clock files you are using cover the full\nrange of the data set. Using the provided clock files (see below)\nwill ensure this.\n\n All models included here are based on a generalized least squares\n(GLS) fit that includes a noise model with covariance between TOAs\n(ECORR/jitter parameters, if narrowband; RNAMP/RNIDX red noise\nparameters, if significant), as well as \"traditional\" EQUAD and EFAC\nparameters. Additional EFAC parameters for the wideband DM measurements\nare also included. All noise model parameters are included in the par\nfiles.\n\n\nCLOCK FILES\n-----------\n\n The clock files used for our analysis are provided in the clock/\nsubdirectory. While the standard files distributed with tempo and\ntempo2 should be consistent with the clock files provided in the current\nrelease at the time of writing, this may be a source of inconsistent\nresults in the future. Please see ./clock/README.clock directory for \ninstallation instructions.\n\n\nPLANNED REVISIONS\n-----------------\n\n The initial release of the data set contained all fundamental data
products needed for pulsar timing analysis: Times of arrival (.tim
files), timing models (.par files), standard template profiles,
clock correction files, and noise modeling MCMC chains. In v2,
parameter correlation matrices were added, as well as alternate versions
of timing model parameter files (\"NoRedNoise\" and \"predictive\"). In v2.1,
post-fit timing residuals for our narrowband data set were made available.
A future release will add a number of other useful derived products as
mentioned in the paper, including dispersion measure time series.\n\n\nCHANGE LOG\n----------
2025/07/17
Addition of the Timing Model Residual files for the
narrowband dataset, including overview plots (v2.1.0).\n2023/09/19\n Addition of \"NoRedNoise\" and \"predictive\" par files, correlation\n matrices, noise modeling chains (v2).\n2023/07/01\n Correction to tar.gz directory structure (v1.0.1).\n2023/06/28\n Initial public release (v1).
Learn more at: nanograv.org
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