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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.

Advanced Search Examples (click to copy):

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

26 results found.

  1. GRB 210610A: Maidanak and AbAO optical observations
  2. GRB 210610A: JCMT SCUBA-2 sub-mm observations
  3. GRB 210610A: Swift/UVOT Detection
  4. GRB 210610A: Fermi GBM observations
  5. GRB 210610A: CAHA 2.2m Second Epoch
  6. GRB 210610A: SAO RAS optical observations
  7. GRB 210610A: CrAO/ZTSH optical observations
  8. GRB 210610B: CrAO/ZTSH optical observations (correction to the GCN circ. 30212)
  9. GRB 210610A: CrAO/ZTSH optical observations
  10. GRB 210610A: CAHA 2.2m observations and light-curve behavior
  11. GRB 210610A: KAIT Optical Detection
  12. GRB 210610A: Spectroscopy and redshift confirmation with the Himalayan Chandra Telescope
  13. Konus-Wind detection of GRB 210610A
  14. GRB 210610A: Swift-XRT refined Analysis
  15. GRB 210610A: RATIR Optical and NIR Detection
  16. GRB 210610A: Swift-BAT refined analysis
  17. GRB 210610A: 1.5m OSN optical observation
  18. GRB 210610A: MITSuME Ishigaki optical observation
  19. Swift GRB 210610A: Global MASTER-Net observations report
  20. Swift GRB 210610A: MASTER optical counterpart observation
  21. GRB 210610A: Enhanced Swift-XRT position
  22. GRB 210610A: Xinglong-2.16m redshift
  23. GRB 210610A: GIT optical detection
  24. GRB 210610A: Xinglong-2.16m optical afterglow observations
  25. GRB 210610A: MITSuME Akeno optical observation
  26. GRB 210610A: Swift detection of a burst with an optical counterpart

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