The release consists of event lists and instrument response functions
for observations of various well-known gamma-ray sources (the Crab
nebula, PKS 2155-304, MSH 15-52, RX J1713.7-3946) as well as
observations of empty fields for background modeling.
The LOFAR Two Meter Sky Survey LoTSS DR2
(:bibcode:`2022A&A...659A...1S`) obtained radio data from 27% of the
northern sky between 120 and 168 MHz in the year 2014 through 2020. This
service publishes polarization spectra of extragalactic radio sources
(radio galaxies and blazars) and the rotation measures derived from them.
We also give redshifts for all sources. The data has a spatial resolution
of 20 arcsec.
