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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

27938 results found.

  1. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  2. GRB 990123 radio observations
  3. GRB990123, early optical counterpart detection
  4. GRB990123, BeppoSAX-NFI X-ray afterglow detection
  5. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  6. GRB981220
  7. GRB 981220 Optical observations
  8. GRB 981226 Optical Observations
  9. GRB 981226
  10. GRB 981226 optical observations
  11. GRB981220 B, R and I band observations
  12. Optical Observations of GRB981226
  13. GRB 981220
  14. GRB 980326/Host Galaxy
  15. Optical Observations of the Host Galaxy of GRB 980519
  16. GRB980703 - BeppoSAX/GRBM detection
  17. RXTE Observation of GRB 980706
  18. GRB980703: LOTIS observation at early times
  19. GRB980613 Optical Observations
  20. GRB 980703 H-band Observations
  21. GRB980703 optical followup
  22. GRB 980613: Detection of the probable host galaxy
  23. GRB 980613 optical observations
  24. GRB 980519 Optical Observations
  25. GRB980519 optical observations
  26. GRB980519 optical observations
  27. GRB980519 optical observations
  28. BSAX Observations of GRB980425 field
  29. GRB 980329 ROSAT observation
  30. GRB980326, optical observations
  31. GRB980329
  32. GRB980329 Keck K-band observations
  33. GRB980329 optical observations
  34. Optical Observations of the GRB 971227 field
  35. GRB971227: Further CAHA R-band images
  36. GRB 971227: CAHA R-band images
  37. GRB 971214: Redshift from Keck Optical Observations
  38. GRB 971214: KPNO Optical Observations

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Download all Circulars as a .tar.gz archive (updated once a day):
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