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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 160509A: 15 GHz upper limits from AMI
  2. GRB 160509A: Further VLA Observations
  3. GRB 160509A MASTER-NET observations
  4. GRB 160509A: CALET Gamma-Ray Burst Monitor detection
  5. GRB 160509A: non-observation of VHE emission with HAWC
  6. GRB 160509A: TLS Tautenburg Afterglow Detection
  7. GRB 160509A: Further Swift/UVOT Observations
  8. GRB 160509A Gemini North redshift
  9. Konus-Wind observation of GRB 160509A
  10. GRB 160509A: DCT Imaging / Afterglow Confirmation
  11. GRB 160509A: MAXI/GSC refined analysis
  12. GRB 160509A: VLA Detection
  13. GRB 160509A: Fermi-LAT refined analysis
  14. GRB 160509A: Swift/UVOT Upper Limit
  15. GRB 160509A: Fermi GBM Detection
  16. GRB 160509A Gemini North candidate afterglow
  17. GRB 160509A: optical observations
  18. GRB 160509A: Swift-XRT afterglow detection
  19. GRB 160509A: Preliminary XRT positon
  20. GRB 160509A: Tiled Swift observations
  21. Correction to GCN 19404; GRB 160509A: MAXI/GSC detection
  22. GRB 160509A: Fermi-LAT prompt detection of a very bright burst

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