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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"

35 results found.

  1. GRB 240529A: FRAM-ORM early optical afterglow observations reveal plateau and rebrightening
  2. GRB 240529A: JinShan optical observations
  3. GRB 240529A: LBT optical detection and late temporal decay
  4. GRB 240529A : MITSuME Akeno optical afterglow detection
  5. GRB 240529A: NOEMA detection
  6. GRB 240529A: radio detection with AMI-LA
  7. GRB 240529A: SAO RAS optical observations
  8. GRB 240529A: MASTER prompt OT detection
  9. GRB 240529A: continued SAO RAS optical observations
  10. GRB 240529A: OSN optical detection
  11. GRB 240529A: further SAO RAS optical observations
  12. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  13. GRB 240529A: 1.3m DFOT Optical observations
  14. GRB 240529A : Mondy optical observations
  15. Konus-Wind detection of GRB 240529A
  16. IPN triangulation of the initial episode of GRB 240529A
  17. GRB 240529A: SAO RAS optical observations
  18. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  19. GRB 240529A: Insight-HXMT/HE detection
  20. GRB 240529A: optical photometry from Konkoly
  21. GRB 240529A: GROWTH-India optical follow-up
  22. GRB 240529A: T193/MISTRAL observations
  23. GRB 240529A: Redshift from GTC/OSIRIS+
  24. GRB 240529A: AKO Optical Afterglow Detection
  25. GRB 240529A: J-band detections with WINTER
  26. GRB 240529A: Skynet Optical Observations
  27. GRB 240529A: Swift-BAT refined analysis
  28. GRB 240529A: Swift-XRT refined Analysis
  29. GRB240529A: BOOTES-6/DPRT optical detection
  30. GRB 240529A: Swift/UVOT Detection
  31. GRB 240529A: NOT optical observations
  32. GRB 240529A: AstroSat CZTI detection
  33. GRB 240529A: GOTO optical afterglow detection
  34. GRB 240529A: Enhanced Swift-XRT position
  35. GRB 240529A: Swift detection of a burst with an optical counterpart

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