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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"

21 results found.

  1. GRB 120327A: SMARTS optical/IR afterglow observations
  2. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  3. GRB 120327A: Zadko optical observations
  4. GRB 120327A: MITSuME Ishigakijima Optical Observation
  5. GRB 120327A: NOT optical observations
  6. GRB 120327A: GTC redshift confirmation
  7. GRB 120327A afterglow detection
  8. GRB 120327A: Swift-XRT refined Analysis
  9. GRB 120327A: CQUEAN grizY Observation
  10. GRB 120327A: Swift/UVOT further analysis
  11. GRB 120327A: Swift-BAT refined analysis
  12. GRB 120327A: Enhanced Swift-XRT position
  13. GRB 120327A: X-shooter redshift
  14. GRB 120327A: Gemini-South redshift
  15. GRB 120327A: TAROT La Silla observatory optical decay
  16. GRB 120327A: IAC80 I-band observations
  17. GROND observations of GRB 120327A
  18. GRB 120327A: REM NIR and optical observations
  19. GRB 120327A: Liverpool Telescope Observations
  20. GRB 120327A: TAROT La Silla observatory optical detection
  21. GRB 120327A: Swift detection of a burst with an optical counterpart

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