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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"

22 results found.

  1. GRB 180205A: Mondy optical observations
  2. GRB 180205A: SEDM Observations
  3. GRB 180205A: BAO optical observations
  4. GRB180205A: Optical observations with DOAO 1m telescope
  5. GRB 180205A: AbAO optical observations
  6. GRB 180205A optical observations
  7. GRB 180205A: confirmation of Swift-BAT trigger time.
  8. GRB 180205A: Optical observations
  9. GRB 180205A: Swift/UVOT Detection
  10. GRB 180205A: Nanshan-1m optical observations
  11. GRB 180205A: Swift-XRT refined Analysis
  12. GRB 180205A: Swift-BAT refined analysis
  13. GRB 180205A: Xinglong TNT optical observation
  14. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  15. GRB 180205A: Nickel telescope optical observations
  16. GRB 180205A: VLT polarimetry
  17. GRB 180205A: Mondy optical observations
  18. GRB 180205A: Fermi GBM observation
  19. GRB 180205A: VLT/X-shooter redshift
  20. GRB 180205A: GROND detection of the NIR/optical afterglow
  21. GRB 180205A: KAIT optical afterglow confirmation
  22. GRB 180205A: Swift detection of a burst with a bright optical counterpart

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Download all Circulars as a .tar.gz archive:
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