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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"

13 results found.

  1. GRB 081028 - PAIRITEL NIR detection
  2. GRB 081028: CrAO optical observations
  3. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  4. GRB 081028: Magellan redshift
  5. GRB081028: UVOT detection of a brightening afterglow
  6. Swift UVOT observations of GRB081028
  7. GRB 081028: Swift-XRT refined analysis
  8. GRB 081028, Swift-BAT refined analysis
  9. GRB 081028: Enhanced Swift-XRT position
  10. GRB 081028: TAROT Calern observatory optical observations
  11. GRB 081028: optical observations at the NOT
  12. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  13. GRB 081028: Swift detection of a burst

Advanced

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