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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 130725A: Swift-XRT refined Analysis
  2. GRB 130725A: Swift/UVOT Upper Limits
  3. GRB 130725A - Faulkes Telescope South Observations
  4. GRB 130725A: MITSuME Ishigakijima Optical Observation
  5. GRB 130725A, Swift-BAT refined analysis
  6. Swift Trigger 563980 is GRB 130725A

Advanced

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