The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P321+03)

Shimwell, T.  W.; Hardcastle, M.  J.; Tasse, C.; Drabent, A.; Botteon, A.; Williams, W. L.; Best, P. N.; Röttgering, H. J. A.; Brüggen, M.; Brunetti, G.; Callingham, J. R.; Chyży, K.  T.; Conway, J. E.; De Gasperin, F.; Haverkorn, M.; Horellou, C.; Jackson, N.; Miley, G. K.; Morabito, L. K.; Morganti, R.; O'Sullivan, S. P.; Schwarz, D. J.; Smith, D. J. B.; van Weeren, R. J.; Vedantham, H. K.; White, G. J.; Ahmadi, A.; Alegre, L.; Arias, M.; Asabere, B.; Bahr-Kalus, B.; Barkus, B.; Bilicki, M.; Böhme, L.; Brentjens, M.; Brienza, M.; Bomans, D. J.; Bonafede, A.; Bonato, M.; Bonnassieux, E.; Boxelaar, J. M.; Camera, S.; Cassano, R.; Chilufya, J.; Cianfaglione, M.; Croston, J. H.; Cuciti, V.; Dabhade, P.; De Rubeis, E.; de Jong, J. M. G. H. J.; Dallacasa, D.; Dettmar, R. J.; Duncan, K. J.; Di Gennaro, G.; Edler, H. W.; Groeneveld, C.; Gürkan, G.; Hajduk, M.; Hale, C. L.; Heesen, V.; Hoang, D. N.; Hoeft, M.; Holties, H.; Horton, M. A.; Iacobelli, M.; Jamrozy, M.; Jarvis, M. J.; Jelic, V.; Kadler, M.; Kondapally, R.; Kunert-Bajraszewska, M.; Loose, M.; Magliocchetti, M.; Małek, K.; Manzano, C.; McKean, J. P.; Mevius, M.; Mingo, B.; Miskolczi, A.; Misra, A.; Moldón, J.; Nair, D. G.; Nakoneczny, S. J.; Orru, E.; Pashapour-Ahmadabadi, M.; Pasini, T.; Petley, J.; Pierce, J. C. S.; Prandoni, I.; Rafferty, D.; Rajpurohit, K.; Riseley, C. J.; Roberts, I. D.; Sethi, S.; Shulevski, A.; Stein, M.; Stuardi, C.; Sweijen, F.; ter Veen, S.; Timmerman, R.; Vaccari, M.; Wijnholds, S.

Published February 16, 2026 | Version v1

Dataset Open

The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P321+03)

In this data release from the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) we present 120-168 MHz images covering 88% of the northern sky. The individual pointing images (at 6′′ and 20′′ resolution) were derived from 12,950 hrs (18.6 PB) of LOFAR High Band Antenna data which were processed through fully automated direction-independent and direction-dependent calibration pipelines that correct for instrumental effects as well as spatially and temporally varying ionospheric distortions. The Stokes I images were then combined, accounting for the rms noise level and telescope beam, to form the final Stokes I mosaic images at 6′′ and 20′′ resolution, with a central frequency of 144MHz. From the 6′′ resolution Stokes mosaics we derived a catalogue of 13,664,379 radio sources (consisting of 16,943,656 Gaussian components), the majority of which have never been detected at radio wavelengths before. These mosaics have a median rms sensitivity of 92 μ Jy/beam; a random and systematic flux density scale accuracy of approximately 6% and 2%, respectively; an astrometric accuracy of 0.24′′; and we estimate that we detect more than 95% of sources with integrated flux densities exceeding nine times the local root mean square noise. This collection contains the individual pointing products, including calibrated uv data (measurement sets and direction-dependent calibration solutions) to allow for re-imaging or post-processing; Stokes I images at 6′′ and 20′′ resolution (with associated scaling factors required to reproduce the mosaic images); Stokes V images at 6′′ resolution for each observing epoch; and Stokes Q and U image cubes at 20′′ and 4′ resolution.

This is pointing P321+03.

Publication: Shimwell et al. 2026 (https://doi.org/10.1051/0004-6361/202557749)

Go to main LoTSS-DR3 Collection

Files

Files (226.5 GB)

Name	Size	Status
images.tar	10.6 GB	Online	Download
Checksum: md5:09ea8764920b296a9586a6771d3a56cc EPIC PID: 11112/3ae962c2-ccb3-4e44-9a46-1040d8f303a5 Description: The Stokes I high (6′′) and low (20′′) 120-168MHz continuum images for this pointing (including restored, residual, model and mask images).
misc.tar	251.1 MB	Online	Download
Checksum: md5:84a5121b342b2c77b278d2ef593d8392 EPIC PID: 11112/aaa927a8-abfb-4b3e-8c1d-6aed09545444 Description: Miscellaneous products (logs and diagnostics) for the direction dependent calibration and imaging processing (DDF-pipeline) of this pointing.
mosaicing_misc.tar	1.7 GB	Offline	Request
Checksum: md5:ec1a327f5ed784b67965a1b2f05414bf EPIC PID: 11112/5ba1689e-6e0c-48bc-b8fb-313450798fdb Description: The flux density scaling factors (NVSS scaling and planar alignment) to be applied during mosaicing as well as the facets identified as bad.
rmsynth_P321+03.tar.gz	65.6 MB	Online	Download
Checksum: md5:7d83e3b0fe6a6168e8021108ad309f10 EPIC PID: 11112/1f8e52ea-44f6-424c-a035-d506e8861fd8 Description: 20′′ RM-synthesis products, including QU spectra, Faraday depth and polarization maps, noise products and catalogues.
stokes_large.tar	40.6 GB	Offline	Request
Checksum: md5:d83902b981120100d551070aa56a1dca EPIC PID: 11112/d7922b0a-1f3c-40b5-aebf-d6761c23cd16 Description: The low (20′′) resolution 120-168MHz Stokes Q and U image cubes for this pointing.
stokes_small.tar	47.6 GB	Online	Download
Checksum: md5:bfcd51658908e41b6d111b6e59e7374e EPIC PID: 11112/8cf70778-3aeb-489a-aba3-4c33cde4bfa8 Description: The very low (4′) resolution 120-168MHz Stokes Q and U image cubes for this pointing and, where available, the low (20′′) resolution Stokes V 120-168MHz image.
uv_L2027325.tar	24.7 GB	Offline	Request
Checksum: md5:14ece45a4fdc861502be26de182d335c EPIC PID: 11112/aaff05cf-c186-4d1a-8d44-75e5a73167c1 Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_L2027621.tar	24.7 GB	Offline	Request
Checksum: md5:66a77000af1f0cd91762bea03e264ce2 EPIC PID: 11112/5e48e594-c1cf-4eef-a0a4-91c635752fa5 Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_L2027626.tar	24.7 GB	Online	Download
Checksum: md5:c019047aa451b35fbb37c601dd432617 EPIC PID: 11112/4536627b-64a7-48a0-ab4d-f510a27149fd Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_L2027633.tar	23.8 GB	Online	Download
Checksum: md5:c97b21b3e3e59239c1297507ec35352b EPIC PID: 11112/209f0d55-51bd-4c04-ac23-58b8d4ccdf1f Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_L2027643.tar	23.8 GB	Offline	Request
Checksum: md5:706841cbae8fb93ecafa84402da51a82 EPIC PID: 11112/a4b46610-f655-4451-9876-0df24e8a62aa Description: The uv-data for an individual pointing, together with the accompanying direction-dependent and refined direction-independent calibration solutions. The solutions are to be applied during imaging, along with those from uv_misc.tar, if available. Depending on how the pointing is packaged, the uv data may be provided as a single uv.tar or as multiple uv_LXXXXXX.tar files, where XXXXXX denotes the observation LOFAR LTA SASID of an observing epoch.
uv_misc.tar	4.1 GB	Online	Download
Checksum: md5:61a3ea8eadb2c2f23f20030168b4e32b EPIC PID: 11112/4bdce0c7-54c0-497b-9867-b374b4b9c7cf Description: Calibration facet boundaries, calibration sky model, as well as merged and smoothed direction dependent calibration solutions for use during re-imaging.

Additional details

Is described by: Publication: 10.1051/0004-6361/202557749 (DOI)

Created: 2026-02-16
Accepted: 2026-01-13

Metadata

$schema	https://repository.surf.nl/schema/lotss-dr3
accref	https://vo.astron.nl/getproduct/LoTSS-DR3/P321%2B03
centeralpha	321.12262528204457
centerdelta	2.9796805555358503
instid	LOFAR.HBA
dateobs	60243.76298611099
naxes	4
pixelsize	19845, 19845, 1, 1
pixelscale	0.00041666667675599456, 0.00041666667675599456
refframe	ICRS
wcs_equinox
wcs_projection	SIN
wcs_refpixel	9923.0, 9923.0
wcs_refvalues	321.12241666667, 2.9798888888889
wcs_cdmatrix	-0.00041666667675599456, 0.0, 0.0, 0.00041666667675599456
bandpassid	120-168MHz
bandpassunit	m
bandpassrefval	2.081892
bandpasshi	2.4982705
bandpasslo	1.7844789
pixflags	Z
coverage	316.9837963165591, -1.1656591957980544, 316.95253500759196, 7.109806810301209, 325.292298325748, 7.109806810301209, 325.26103701678085, -1.1656591957980487
related_products	https://vo.astron.nl/lotss_dr3/q/dlpointing/dlmeta?ID=ivo%3A//astron.nl/%7E%3FLoTSS-DR3/P321%2B03
datefirstobs	60240.686747685075
datelastobs	60254.692627314944
dateallobs	60240.686747685075, 60242.68129629642, 60243.76298611099, 60254.692627314944, 60251.74158564815, 60250.74431712972
id	P321+03

	All versions	This version
Views	2	2
Downloads	45	45
Data volume	716.0 GB	716.0 GB

The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P321+03)

Files

Files (226.5 GB)

Additional details

Related works

Dates

Collection

The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P321+03)

Creators

Description

Files

Files (226.5 GB)

Additional details

Related works

Dates

Collection