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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"

25 results found.

  1. GRB 130807A: Swift-XRT refined analysis
  2. Konus-Wind observation of GRB 120716A
  3. GRB 110709B BAT refined analysis
  4. GRB 060124: Radio Observations
  5. GRB060124 optical observations
  6. GRB 060124: HETE detection and spectrum of the main peak
  7. Konus-Wind observation of GRB 060124
  8. GRB060124: detailed XRT analysis
  9. GRB 060124 Optical Observations
  10. GRB 060124: ART optical limits during the burst
  11. GRB 060124: Keck optical spectrum
  12. GRB 060124: Keck Absorption Redshift
  13. GRB 060124: MDM Optical Spectrum
  14. GRB 060124: XRT refined analysis
  15. GRB 060124: R band Observations
  16. GRB 060124 : Optical observation at Xinglong and Kiso
  17. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  18. GRB 060124: TAROT optical limits
  19. GRB 060124: Swift/UVOT Observation
  20. GRB 060124: Confirmation of the Afterglow
  21. GRB 060124: XRT position
  22. GRB 060124: Optical Afterglow Candidate from Tautenburg
  23. GRB 050124 : Kiso Optical limit
  24. GRB 060124: Optical Observations at Tautenburg
  25. GRB 060124: Swift-BAT detection of a burst

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