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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 200524A: Redshift from Gemini-North
  2. Konus-Wind observation of GRB 200524A
  3. GRB 200524A: SAO RAS optical observations
  4. GRB 200524A: Assy continued optical observations
  5. GRB 200524A: Assy optical observations
  6. GRB 200524A: optical upper limits from further MITSuME Akeno observation
  7. GRB 200524A: CrAO optical observations
  8. GRB 200524A: Kitab observatory afterglow observations
  9. GRB 200524A: AstroSat CZTI detection
  10. GRB 200524A: Further Liverpool Telescope observations
  11. GRB 200524A: KAIT Optical Observations
  12. GRB 200524A: MITSuME Akeno optical observation
  13. GRB 200524A: Swift-XRT afterglow detection
  14. GRB 200524A: OAJ multicolor afterglow detection
  15. GRB 200524A: Fermi GBM detection
  16. GRB 200524: Swift/UVOT observations missed the ZTF20abbiixp position
  17. GRB 200524A: CAHA multicolor afterglow detection
  18. GRB 200524A: 1.3m DFOT Optical Observation of ZTF20abbiixp
  19. GRB 200524A: Liverpool Telescope observations
  20. GRB 200524A: Correction to the GCN 27800
  21. GRB 200524A: 3.6m DOT observations of the afterglow candidate ZTF20abbiixp
  22. GRB 200524A: CrAO observations of ZTF20abbiixp
  23. Fermi GRB 200524A: Global MASTER-Net observations report
  24. GRB 200524A: GROWTH-India confirmation of optical afterglow
  25. ZTF Discovery of ZTF20abbiixp: The Likely Optical Afterglow to GRB 200524A
  26. GRB 200524A: Swift ToO observations
  27. GRB 200524A: Fermi-LAT detection

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