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Fig. 1. The status of the LoTSS observations as of April 2021 and the approximate current sensitivity coverage (accounting for station projection and typical sensitivities achieved to date) overlaid on the Haslam et al. (1982) 408 MHz all-sky image (corresponding to yellow to deep red colours, with associated contours). The yellow and black outlines show the LoTSS-DR1 and LoTSS-DR2 areas respectively and the small black dots show the 3168 LoTSS grid positions. LoTSS-DR1 included 63 pointings, LoTSS-DR2 includes 841 pointings; we have fully observed 1623 pointings including those of DR2, a further 154 pointings are partly observed and observations still need to be conducted for 1391 pointings to complete the survey. |
To process the data `Pre-processed' (flagged and averaged) they are first ‘staged’ in the LTA; staging is the procedure of copying data from tape to disk and is necessary to make the large archived datasets available for transfer to a compute cluster. The data are then processed with a direction independent (DI) calibration pipeline that is executed on compute facilities at Forschungszentrum Jülich and SURF (see Mechev et al. 2017 and Drabent et al. 2019). These compute clusters are connected to the local LTA sites with sufficiently fast connections to mitigate the difficulties that would be experienced if we were to download these large datasets to external facilities. Unfortunately data transfer issues are not yet fully mitigated as we currently do not process data on a compute cluster local to the Pozna ́n archive and instead we copy these data (6% of LoTSS-DR2) to Forschungszentrum Jülich or SURF for processing.
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