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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"

27 results found.

  1. GRB 110422A: MASTER first 30 min OT light curve
  2. GRB 110422A: Herschel FIR observation preliminary report
  3. GRB 110422A: optical observations in CrAO
  4. GRB 110422A: Update of Herschel FIR observation schedule
  5. GRB 110422A: optical observations in CrAO, second epoch
  6. GRB 110422A: Redshift confirmation from GTC
  7. GRB 110422A: tentative redshift from TNG
  8. GRB 110422A: Suzaku WAM observation of the prompt emission
  9. GRB 110422A: Herschel observation scheduled
  10. GRB110422A: NOT optical follow-ups
  11. GRB 110422A: optical observations in CrAO
  12. GRB110422A: MITSuME Ishigakijima Optical Observation
  13. Konus-Wind observation of GRB 110422A
  14. GRB 110422A: Further NOT observation
  15. GRB 110422A: Swift/UVOT Detection of optical afterglow
  16. GRB 110422A: Swift-XRT refined Analysis
  17. GRB 110422A: CQUEAN griz Observation
  18. GRB 110422A: THO optical observations
  19. GRB 110422A: Enhanced Swift-XRT position
  20. GRB 110422A: correction to the GCN circ. 11958
  21. GRB 110422A: TNG optical observations
  22. GRB 110422A: SAO RAS optical observations
  23. GRB 110422A: NOT optical observation
  24. GRB 110422A: MASTER earlier OT polarization observations
  25. GRB 110422A: Swift-BAT refined analysis
  26. GRB 110422A: Mondy optical observations
  27. GRB 110422A: Swift detection of a burst

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Download all Circulars as a .tar.gz archive:
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