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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"

26149 results found.

  1. GRB980519 Secondary Standards
  2. BATSE on-board GRB trigger change
  3. GRB 980519 Optical Observations
  4. GRB 980519
  5. GRB980519 optical observations
  6. GRB 980519 Optical Observations
  7. GRB980519 BATSE Observations
  8. GRB980519 Optical Observations
  9. GRB980519 Optical Observations
  10. GRB 980519 Optical Observations
  11. GRB980515, BeppoSAX IAUC to be submitted
  12. BSAX Observations of GRB980425 field
  13. IPN web site of GRBs
  14. GRB980425 BATSE observations
  15. SAX J0840.7+2248 Optical Observations
  16. GRB980425: optical obs.
  17. GRB980425: Radio Observations
  18. report on BSAX observations of GRB980425
  19. GRB 980329 ROSAT observation
  20. GRB980326 X-ray Observations
  21. GRB980326, optical observations
  22. GRB980326, optical observations
  23. GRB980329, Fading IR counterpart to radio source
  24. GRB980329 Keck K-band observations
  25. GRB980329 sub-millimeter observations
  26. GRB980329 optical observations
  27. GRB980329 near-IR observations
  28. GRB980329 near-IR observations
  29. GRB980326 optical observations
  30. GRB980329 optical observations
  31. GRB980329 VLA observations
  32. GRB980329 optical observations
  33. GRB980329 optical observations
  34. GRB980326 optical observations
  35. GRB980326 optical observations
  36. Optical Observations of GRB 970508
  37. Near-IR follow-up on GRB 971227
  38. Optical Observations of the GRB 971227 field
  39. Optical Observations on GRB 971227
  40. GRB971227: Plaskett R-band observations
  41. GRB 971227: Optical clarifications
  42. GRB971227: Further CAHA R-band images
  43. GRB971227: LOTIS observations
  44. GRB971214: Optical Observations and Calibrations
  45. GRB 971214: Optical Observations
  46. Radio Observations of GRB 971214 at the VLA
  47. GRB 971024: Refined analysis by USNOFS Observations
  48. GRB 971024: KPNO Optical Observations
  49. GRB 970828: Palomar Observations

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Download all Circulars as a .tar.gz archive:
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