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 144 MHz. 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. The 6'' resolution mosaics have a median rms sensitivity of 92 μJy/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. Below we provide access to the catalogues and all Stokes I 6'' and 20'' resolution mosaic products. 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 are available upon request (please e-mail lotss-dr3-infrastructure@strw.leidenuniv.nl).
LoTSS-DR3 is described in detail by Shimwell et al., 2026. Please cite the survey paper and any other relevant LoTSS description paper and give the acknowledgements listed on our credits pages if using these images for science.
Source catalogue
PyBDSF source and Gaussian catalogues are available. v1.0 is the catalogue released with and described by the DR3 paper. Updated versions will be released as necessary.
- Version 1.0 source catalogue and Gaussian catalogue.
Interactive images
HIPS images of the 6” or 9” high-resolution mosaics and the 20” low-resolution mosaics can be viewed at https://lofar-surveys.org/public_hips/LoTSS_high_hips_latest/ and https://lofar-surveys.org/public_hips/LoTSS_low_hips_latest/ respectively. These links can be viewed in the web browser or, for best results, in the Aladin app.
Mosaic position search
Mosaic cutout service
Mosaics
The mosaics in the table below are full-quality DR3 mosaics with flux scales aligned with reference to NVSS and astrometric corrections applied.