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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"

24 results found.

  1. GRB 180728A: discovery of the associated supernova
  2. GRB 171205A: Likely association with low-z spiral galaxy
  3. GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
  4. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  5. GRB 101225A Late-time emission observed by Swift-BAT
  6. Redshift solution(s) for GRB101213A from Swift-XRT data
  7. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  8. GRB 100418A: Possible Evidence for a Supernova
  9. GROND observations of GRB100316D/SN2010bh
  10. Emerging Supernova in the Afterglow of GRB 100316D
  11. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  12. GRB 100316D: ATCA radio observations
  13. GRB 100316D: Possible Supernova
  14. GRB 100316D: Pre-burst emission measured by BAT
  15. GRB 100316D: Further Gemini observations
  16. GRB 100316D: Swift/UVOT Observations
  17. GRB 100316D: Swift XRT enhanced position and further refined analysis
  18. Tentative redshift of GRB100316D from X-ray data
  19. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  20. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  21. GRB 100316D: VLT/X-shooter observations
  22. GRB 100316D: Swift-BAT refined analysis
  23. GRB 100316D: Swift XRT refined analysis
  24. GRB 100316D: Swift detection of a burst

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Download all Circulars as a .tar.gz archive:
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