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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"

26 results found.

  1. GRB 140419A: Continued Mondy optical observations
  2. GRB 140419A: Continued Mondy optical observations
  3. GRB 140419A, LOAO R-band observations
  4. GRB 140419A: Mondy optical observations
  5. GRB 140419A: Refined NOT photometry
  6. GRB 140419A: Continued RATIR Optical and NIR Observations
  7. GRB140419A: NOT optical observations
  8. GRB 140419A: KAIT Refined Analysis
  9. GRB 140419A: Continued RATIR Optical and NIR Observations
  10. Konus-Wind observation of GRB 140419A
  11. GRB 140419A, Optical Observations
  12. GRB 140419A: MITSuME Ishigakijima Optical Observation
  13. GRB 140419A: MITSuME Okayama Optical Observation
  14. GRB 140419A: Swift UVOT refined analysis
  15. GRB 140419A: P60 Observations
  16. GRB 140419A: Swift-XRT refined Analysis
  17. GRB 140419A: Swift-BAT refined analysis
  18. GRB 140419A: T24 optical observations
  19. GRB 140419A: Gemini-N redshift
  20. GRB 140419A: Enhanced Swift-XRT position
  21. GRB140419A: UVOT detects fading afterglow in white but not in u filter
  22. GRB 140419A: CARMA early 3mm detection
  23. GRB 140419A: RATIR Optical and NIR Observations
  24. GRB 140419A: ROTSE-III Detection of Optical Counterpart
  25. GRB 140419A (Swift trigger 596426) : KAIT optical candidate
  26. GRB 140419A: Swift detection of a burst with optical afterglow

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