All raw observational data from the imaging surveys through the first year of survey observations (1 July 2019 - 30 June 2020) are released. The survey medium-deep observations during this period were focused on  the Perseus-Pisces region, with an additional medium-deep field in the HETDEX region. The wide tier of the survey focused on the HETDEX region (for overlap with the LoTSS DR1), with additional coverage in the Herschel-ATLAS North Galactic Cap, and in the fall sky between 22h-0h. In total, there are 218 observations; 65 of these observations build repeated coverage of nine medium-deep fields. There are observations of 160 unique fields; with an effective field-of-view (based on spacing between fields) of 6.44 square degrees, the released observations cover just over 1000 square degrees of sky.

Figure 1 shows the sky coverage of released observations, with the full four-year survey footprint shown for reference. The color coding indicates the version of the pipeline used for processing (see "Apercal versions applicable to the release" for details), where "None" means no processing was performed (see "Notes on specific observations"). "AMES" refers to observations in the medium-deep footprint, and Figure 2 shows these repeated medium-deep fields separately as individual observations of a field may be processed by different versions of the pipeline.

Figure 1. The sky coverage of released observations, with the full four-year survey footprint shown for reference. The color coding indicates the version of the pipeline used for processing (see "Apercal versions applicable to the release" for details).

Figure 2. A view of the processing for medium-deep fields with repeat visits. The observations are ordered in time-order and the color code refers to the same processing as for the figure above.

Notes on the data quality/processing  for specific observations can be found here.

A machine-readable summary table of these observations can be exported using the VO infrastructure, more details are provided in section “User Interfaces”.

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Daily image of the week

On June 13-17, the LOFAR Family Meeting took place in Cologne. After two years LOFAR researchers could finally meet in person again. The meeting brings together LOFAR users and researchers to share new scientific results.
https://www.astron.nl/dailyimage/main.php?date=20220621

Our renewed ‘Melkwegpad’ (Milky Way Path) is finished! The new signs have texts in Dutch on the one side and in English on the other side. The signs concerning planets have a small, 3D printed model of that planet in their centre.
https://www.astron.nl/dailyimage/
#Melkwegpad @RTVDrenthe

Daily image of the week

The background drawing shows how the subband correlator calculates the array correlation matrix. In the upper left the 4 UniBoard2s we used. The two ACM plots in the picture show that the phase differences of the visibilities vary from 0 to 360 degrees.

Daily image of the week: Testing with the Dwingeloo Test Station (DTS)
One of the key specifications of LOFAR2.0 is measuring using the low- and the highband antenna at the same time. For this measurement we used 9 lowband antenna and 3 HBA tiles.
https://www.astron.nl/dailyimage/main.php?date=20220607

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