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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Event Groups by event name (e.g. 'GRB 123456A', 'GRB123456A', '123456A').

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Download all Circulars as a .tar.gz archive (updated once a day):
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