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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"

32 results found.

  1. GRB 171205A: Host galaxy photometric properties
  2. KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
  3. GRB 120722A: optical upper limit
  4. GRB 120422A: Konkoly optical observations
  5. GRB 120422A: SN identification from GTC
  6. GRB 120422A: P200 NIR detection
  7. GRB 120422A: CARMA 3mm observations
  8. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  9. GRB 120422A: Gemini-N detection of a supernova
  10. GRB 120422A: i-band re-brightening and possible SN detection
  11. GRB 120422A: optical observations
  12. GRB 120422A, the review of the sky area in plate archives
  13. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  14. GRB 120422A: MITSuME Ishigakijima upper limit
  15. GRB 120422A: 272 GHz observations from SMA
  16. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  17. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  18. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  19. GRB 120422A GROND observations
  20. GRB 120422A: Super-LOTIS early observations
  21. GRB 120422A: EVLA Detection
  22. GRB 120422A: Xinglong TNT optical upper limit
  23. GRB 120422A: NOT optical observations
  24. GRB 120422A: Gemini redshift of candidate host
  25. GRB 120422A: Zadko observatory - Gingin optical observations
  26. GRB 120422A: Swift-XRT refined Analysis
  27. GRB 120422A: A Swift/UVOT Detection
  28. GRB 120422A: Enhanced Swift-XRT position
  29. GRB 120422A: Swift-BAT refined analysis
  30. GRB 120422A: Gemini observations
  31. GRB 120422A: Faulkes Telescope North observations
  32. GRB 120422A: Swift detection of a burst

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