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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"

29 results found.

  1. GRB 131030A, Optical Observations
  2. GRB 131030A: MITSuME Akeno Optical observation
  3. GRB 131030A: RATIR Optical and NIR Upper Limits
  4. GRB 131030A: Continued RATIR Optical and NIR Observations
  5. GRB 131030A: Swift-BAT refined analysis
  6. GRB 131030A: Continued RATIR Optical and NIR Observations
  7. GRB 131030A: Continued RATIR Optical and NIR Observations
  8. GRB 131030A: the 2nd epoch of SAO RAS observations
  9. LOAO B,R Observation of GRB131030A
  10. GRB 131030A - RoboPol optical afterglow polarimetry
  11. GRB 131030A: Bassano Bresciano Observatory optical observations
  12. GRB131030A : xinglong TNT optical observation
  13. GRB 131030A: P60 observations
  14. GRB 131030A: RATIR Optical and NIR Observations
  15. GRB 131030A: TAROT La Silla observatory optical observations
  16. GRB 131030A: T21 optical observations
  17. GRB 131030A: Swift-XRT refined Analysis
  18. GRB 131030A: Enhanced Swift-XRT position
  19. GRB 131030A: Swift/UVOT Detection
  20. Konus-Wind observation of GRB 131030A
  21. GRB 131030A: SAO RAS optical observations
  22. GRB 131030A: 1.23m CAHA BVRI-band observations
  23. GRB 131030A: D50+BART detection and light curve optical decay
  24. GRB 131030A: Spectroscopy from 10.4m GTC
  25. GRB 131030A: NOT redshift
  26. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  27. GRB 131030A: MASTER optical observation
  28. GRB 131030A: Watcher OT detection
  29. GRB 131030A: Swift detection of a burst with an optical counterpart

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