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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"

24044 results found.

  1. BeppoSAX ALERT GRB990806: Summer GRB
  2. BeppoSAX NFI Observation of GRB990705
  3. BeppoSAX NFI Observation of GRB990705
  4. GRB990704
  5. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  6. BeppoSAX: GRB990625
  7. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  8. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  9. BeppoSAX: A new fast X-ray transient
  10. GRB990510: X-ray afterglow
  11. GRB 990510: BATSE Observations
  12. GRB 990506: BATSE Observations
  13. GRB990323 PRECISE IPN POSITION
  14. GRB990316: simultaneous optical observation
  15. GRB990316 - Optical null results
  16. ASM/IPN error box for GRB 990308 (BATSE #7457)
  17. GRB 990308a and GRB 990308b
  18. BATSE Resumes Normal Operations
  19. Search for Potential Images of GRB 990123
  20. Search for Potential Images of GRB 990123
  21. GRB990123, OSSE observations
  22. GRB 990123: Strong MeV CGRO-COMPTEL detection now posted on WWW
  23. GRB 990123: BATSE Observations
  24. GRB990123, early optical counterpart detection
  25. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  26. Possible identification of SN1999E with GRB980910
  27. GRB 980923 BATSE Observations
  28. GRB980703 - BeppoSAX/GRBM detection
  29. GRB 980703: BATSE Observations
  30. RXTE Observation of GRB 980706
  31. GRB980703: LOTIS observation at early times
  32. GRB 980703: ASM Position & Intensity
  33. GRB 980613: BATSE Observations
  34. SGR1627-41, BeppoSAX-GRBM detections
  35. Discovery of a new SGR source, SGR1627-41
  36. BATSE on-board GRB trigger change
  37. GRB980519 BATSE Observations
  38. BATSE on-board GRB trigger change
  39. GRB980519, BeppoSAX-WFC updated position
  40. GRB980519, BeppoSAX-WFC position
  41. GRB980425 BATSE observations
  42. GRB 971024: Refined analysis by USNOFS Observations
  43. GRB 971024: USNO Observations
  44. GRB 970925: BATSE Localization

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