The website is the German ministry for civil protection, who seems to have gotten it from the German Aerospace Center (DLR). I have not seen a good source in English yet. The page title is rather undescriptive so the title is rather a summary of the contents than a translation. More links:
The public is being sent notifications through the emergency information app NINA (like the cell broadcast alarm system used in other countries, except you need to install the software and it needs internet access to function)
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[ 2.4 ms ] story [ 7.1 ms ] threadPossible impact corridors (mostly visual/numeric): https://bbk.bund.de/ueberflug
Orbit (English): https://www.n2yo.com/satellite/?s=47853 | https://www.satview.org/?sat_id=47853U
Discussion thread (German, containing some local news article links also): https://www.astrotreff.de/forum/index.php?thread/289262-de-o...
2021 article about the battery pack (English): https://spaceflightnow.com/2021/03/12/garbage-pallet-jettiso...
The public is being sent notifications through the emergency information app NINA (like the cell broadcast alarm system used in other countries, except you need to install the software and it needs internet access to function)