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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"

11836 results found.

  1. GRB 080928: Fermi GBM detection
  2. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  3. GRB 080925: Suzaku WAM observation of the prompt emission
  4. GRB 080927: Fermi GBM detection
  5. GRB 080925: Fermi GBM Detection
  6. GRB 080920: Fermi GBM detection
  7. GRB 080913B: Fermi GBM detection
  8. GRB 080916C: Fermi GBM Spectral Analysis
  9. GRB 080916C: IRSF/SIRUS NIR Observation
  10. Fermi/GBM Data Now Available
  11. GRB 080916A: Fermi GBM detection
  12. GRB 080916C: Swift UVOT Refined Analysis
  13. GRB 080916C: Swift XRT refined analysis
  14. Konus-Wind observation of GRB 080916C
  15. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  16. GRB 080916C: Swift/XRT detection of possible afterglow
  17. GRB 080916C: Fermi LAT observation
  18. GRB 080916C: Fermi GBM Detection
  19. GRB 080912 : Fermi GBM detection
  20. GRB 080906B: Fermi GBM detection
  21. GRB 080905C: Fermi GBM detection
  22. Swift trigger 324362 (LS I +61 303 ?)
  23. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  24. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  25. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  26. GRB 080825C: Fermi GBM Spectral Analysis
  27. GRB080825C: Fermi-LAT observations
  28. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  29. GRB080823: Fermi Gamma-ray Burst Monitor detection
  30. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  31. GRB080825C: GLAST Burst Monitor detection
  32. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  33. GRB060908: optical observations
  34. GRB 060218: rebrightening
  35. GRB990705: No Evidence for Neutrino Signal
  36. GRB990705: Intriguing Positional Coincidences

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Download all Circulars as a .tar.gz archive:
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