The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P036+01)

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 (P036+01)

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 P036+01.

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

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Files

Files (307.9 GB)

Name	Size	Status
images.tar	23.5 GB	Offline	Request
Checksum: md5:5fccdb5ed79280169b23473084e76e55 EPIC PID: 11112/8a63e769-af0f-403b-b469-c03c7cee6d06 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	337.2 MB	Offline	Request
Checksum: md5:0493b82e3500f89d617038240bdcaf6e EPIC PID: 11112/005ac0f1-3e76-493d-8f18-ebbcb694b790 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	Online	Download
Checksum: md5:827efda08671f07dfe515269e8836f45 EPIC PID: 11112/856261bb-5b29-4cc2-9ac6-674bf7e24244 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_P036+01.tar.gz	37.6 MB	Online	Download
Checksum: md5:65daeca510544bc5713c701afb7c5bbb EPIC PID: 11112/0ff9374b-5527-4dc1-83b8-af27006983b6 Description: 20′′ RM-synthesis products, including QU spectra, Faraday depth and polarization maps, noise products and catalogues.
stokes_large.tar	41.5 GB	Online	Download
Checksum: md5:08d32216ac7b3fdb423ea44d750fc3fd EPIC PID: 11112/a48dcec7-8ac1-4e5e-91f2-e014d3d60b0d Description: The low (20′′) resolution 120-168MHz Stokes Q and U image cubes for this pointing.
stokes_small.tar	9.8 GB	Online	Download
Checksum: md5:1528d55dddf97e89dbdc45c8e56cc4a2 EPIC PID: 11112/c4589cf1-e344-4992-afc3-391d5ada7228 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_L569675.tar	55.4 GB	Offline	Request
Checksum: md5:aec082adc8c0b6614f9fa4a87c1fba27 EPIC PID: 11112/2dc1f3cb-b44c-4a08-a270-a71b6b37c989 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_L570755.tar	57.5 GB	Online	Download
Checksum: md5:5aeb6a50fd665b1ec614da57857c3c72 EPIC PID: 11112/72027889-df8f-4613-8fd7-e48d4cd24244 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_L786081.tar	24.3 GB	Offline	Request
Checksum: md5:38c49c97f517b5df4fb71dee63c46849 EPIC PID: 11112/8bb2181a-4649-4566-8f31-2dac74d02826 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_L786207.tar	27.0 GB	Online	Download
Checksum: md5:6b0da4a74dec2da4ddf94a7846ee4caa EPIC PID: 11112/0943227c-31d2-4342-806b-8917d80c1e35 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_L796162.tar	52.0 GB	Offline	Request
Checksum: md5:e57aeedcf56429dfc4dd0b3eda5418e3 EPIC PID: 11112/d7863d5c-2ed9-4a01-918a-d3100df57071 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	14.8 GB	Online	Download
Checksum: md5:f446b60cf75d567184eefac1875a96dc EPIC PID: 11112/f9eac539-1b66-45f8-8c6f-46da0320a74a 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/P036%2B01
centeralpha	36.19857087277154
centerdelta	1.1147630555492993
instid	LOFAR.HBA
dateobs	57813.550347222015
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	36.1983625, 1.11497138889
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	32.054813724870726, -3.0257087362662145, 32.04313948927116, 5.249807836878361, 40.35358551072885, 5.249807836878367, 40.341911275129284, -3.0257087362662145
related_products	https://vo.astron.nl/lotss_dr3/q/dlpointing/dlmeta?ID=ivo%3A//astron.nl/%7E%3FLoTSS-DR3/P036%2B01
datefirstobs	57811.57430555578
datelastobs	59122.97217592597
dateallobs	57811.57430555578, 57813.550347222015, 59034.240972222295, 59032.23958333349, 59122.97217592597
id	P036+01

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The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P036+01)

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The LOFAR Two-metre Sky Survey (LoTSS) VII. Third data release (P036+01)

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