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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 Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

6 results found.

  1. GRB 131018B: RATIR Optical/NIR Observations
  2. GRB 131018B: Further Swift-XRT observations.
  3. GRB 131018B: Swift/UVOT Upper Limits
  4. GRB 131018B: Swift-XRT observations
  5. GRB 131018B: Fermi GBM observation
  6. GRB 131018B: Fermi-LAT detection of a burst

Advanced

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