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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"

30 results found.

  1. GRB 091127: Detection of a Supernova
  2. GRB 091127: Skynet/PROMPT Observations of Possible Host Galaxy
  3. GRB 091127: GAO 150cm telescope Optical Observation
  4. GRB091127: Continuing Swift/UVOT Observations
  5. GRB 091127, SMARTS optical/IR afterglow observations
  6. GRB 091127: Zadko Telescope Observations
  7. GRB 091127: redshift confirmation with X-shooter
  8. GRB 091127: Skynet/PROMPT Continued Observations of Fading
  9. GRB 091127: Suzaku WAM observation of the prompt emission
  10. GRB 091127: Skynet/PROMPT Observations of Fading
  11. GRB 091127: Radio observations
  12. Konus-Wind observation of GRB 091127
  13. GRB 091127: TAROT La Silla observatory optical observations
  14. GRB 091127: optical observations
  15. GRB 091127: LABOCA/APEX submm observations
  16. GRB 091127: Further NOT optical observations
  17. GRB 091127: Fermi GBM detection
  18. GRB 091127: MASTER early optical transient polarimetry
  19. GRB 091127: Gemini-N redshift
  20. GRB 091127: Swift-XRT afterglow detection and analysis
  21. GRB 091127: TAROT La Silla observatory optical decay
  22. GRB 091127: Swift/UVOT observations
  23. GRB 091127: CAHA 1.23m I-band observations
  24. GRB 091127: Swift-BAT refined analysis
  25. GRB 091127: NOT observations
  26. GRB 091127 : GROND observations
  27. GRB 091127: REM NIR afterglow detection
  28. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  29. GRB 091127: Liverpool Telescope afterglow candidate
  30. GRB 091127: Swift detection of a burst

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