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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"

28857 results found.

  1. GRB 991106, LOTIS Optical Observations
  2. GRB991105: SAX-GRBM/-WFC detection
  3. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  4. GRB ALERT: GRB991105
  5. GRB 991014 - BeppoSAX NFI observations
  6. GRB991014 BATSE Observations
  7. Super-LOTIS optical observation of GRB991014
  8. BeppoSAX ALERT: GRB991014
  9. GRB 990915 optical observations
  10. BATSE GRB trigger criteria
  11. IPN error box for GRB990915 (=BATSE 7766)
  12. IPN localization of BATSE #7766 (GRB990915)
  13. GRB990806: BATSE Observations
  14. BeppoSAX ALERT GRB990806: Summer GRB
  15. BeppoSAX NFI Observation of GRB990705
  16. BeppoSAX NFI Observation of GRB990705
  17. GRB990704
  18. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  19. BeppoSAX: GRB990625
  20. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  21. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  22. BeppoSAX: A new fast X-ray transient
  23. GRB990510: X-ray afterglow
  24. GRB 990510: BATSE Observations
  25. GRB 990506: BATSE Observations
  26. GRB990323 PRECISE IPN POSITION
  27. GRB990316: simultaneous optical observation
  28. GRB990316 - Optical null results
  29. ASM/IPN error box for GRB 990308 (BATSE #7457)
  30. GRB 990308a and GRB 990308b
  31. BATSE Resumes Normal Operations
  32. Search for Potential Images of GRB 990123
  33. Search for Potential Images of GRB 990123
  34. GRB990123, OSSE observations
  35. GRB 990123: Strong MeV CGRO-COMPTEL detection now posted on WWW
  36. GRB 990123: BATSE Observations
  37. GRB990123, early optical counterpart detection
  38. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  39. Possible identification of SN1999E with GRB980910
  40. GRB 980923 BATSE Observations
  41. GRB980703 - BeppoSAX/GRBM detection
  42. GRB 980703: BATSE Observations
  43. RXTE Observation of GRB 980706
  44. GRB980703: LOTIS observation at early times
  45. GRB 980703: ASM Position & Intensity
  46. GRB 980613: BATSE Observations
  47. SGR1627-41, BeppoSAX-GRBM detections
  48. Discovery of a new SGR source, SGR1627-41
  49. BATSE on-board GRB trigger change
  50. GRB980519 BATSE Observations
  51. BATSE on-board GRB trigger change
  52. GRB980519, BeppoSAX-WFC updated position
  53. GRB980519, BeppoSAX-WFC position
  54. GRB980425 BATSE observations
  55. GRB 971024: Refined analysis by USNOFS Observations
  56. GRB 971024: USNO Observations
  57. GRB 970925: BATSE Localization

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