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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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.

Lucene Examples (click to copy):

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

22 results found.

  1. GRB 230414B: Nickel and KAIT telescope optical observations
  2. GRB 230414B Swift-BAT refined analysis
  3. GRB 230414B: Swift/UVOT Detection
  4. GRB 230414B: Osservatorio Astronomico Nastro Verde - Sorrento: optical observations
  5. GRB 230414B: 3.6m DOT Optical observations, slow decay at early epochs
  6. GRB 230414B: Montarrenti Observatory late time optical afterglow detection
  7. GRB 230414B: Lulin 40cm-SLT optical limit
  8. GRB 230414B: Bassano Bresciano Observatory optical observations
  9. GRB 230414B: Redshift from OSIRIS/GTC
  10. GRB 230414B: AbAO optical observations
  11. GRB 230414B: Swift-XRT refined Analysis
  12. GRB 230414B: Dabancheng/GHOST optical observations
  13. GRB 230414B: slow optical light curve decay
  14. GRB 230414B: SAO RAS optical observations
  15. GRB 230414B: Enhanced Swift-XRT position
  16. GRB 230414B: 1.3m DFOT Optical observations
  17. GRB 230414B: GROWTH India Telescope afterglow confirmation
  18. GRB 230414B (correction GRB name in the GCN 33615): Mondy optical afterglow candidate
  19. GRB 230414B: Nanshan/HMT optical afterglow detection
  20. Swift GRB 230414B: Global MASTER-Net observations report
  21. GRB 230414B: Prompt enhanced Swift-XRT position
  22. GRB 230414B: Swift detection of a burst

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Download all Circulars as a .tar.gz archive:
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