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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 050525a, Mid-Infrared Observations
  2. GRB 050525: RTT150, Optical observations
  3. GRB 050525: MITSuME Optical Observation in VRI
  4. GRB 050525 : Lulin optical afterglow observations
  5. GRB050525: Super-LOTIS observations
  6. GRB 050525, spectral lag pseudo-redshift
  7. GRB 050525a: Gemini/GMOS Spectra
  8. GRB 050525: BART optical observation
  9. GRB 050525A: BOOTES simultaneous optical observations
  10. GRB 050525A: Swift-BAT refined analysis
  11. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  12. GRB 050525: pseudo-redshift
  13. Swift/UVOT UV and optical detections of GRB 050525
  14. Konus-Wind observation of GRB 050525
  15. GRB 050525: TAROT observations of the early afterglow
  16. INTEGRAL detection of GRB 050525
  17. GRB 050525, infrared observations
  18. GRB 050525: Optical observation
  19. GRB 050525: observatons of the optical afterglow
  20. GRB050525: ROTSE-III Refined Analysis
  21. GRB 050525 - Very Bright, Not Short
  22. GRB 050525: Swift Detection of a Bright, Possibly Short Burst

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Download all Circulars as a .tar.gz archive:
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