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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"

24655 results found.

  1. Discovery of a new SGR source, SGR1627-41
  2. GRB980613 Optical Observations
  3. GRB980613 observations from Palomar
  4. GRB 980613 optical/IR obs.
  5. GRB980613 Near Infra-Red Observations
  6. GRB971214 Secondary Standards
  7. GRB980519 Secondary Standards
  8. BATSE on-board GRB trigger change
  9. GRB 980519 Optical Observations
  10. GRB 980519
  11. GRB980519 optical observations
  12. GRB 980519 Optical Observations
  13. GRB980519 BATSE Observations
  14. GRB980519 Optical Observations
  15. GRB980519 Optical Observations
  16. GRB 980519 Optical Observations
  17. GRB980515, BeppoSAX IAUC to be submitted
  18. BSAX Observations of GRB980425 field
  19. IPN web site of GRBs
  20. GRB980425 BATSE observations
  21. SAX J0840.7+2248 Optical Observations
  22. GRB980425: optical obs.
  23. GRB980425: Radio Observations
  24. report on BSAX observations of GRB980425
  25. GRB 980329 ROSAT observation
  26. GRB980326 X-ray Observations
  27. GRB980326, optical observations
  28. GRB980326, optical observations
  29. GRB980329, Fading IR counterpart to radio source
  30. GRB980329 Keck K-band observations
  31. GRB980329 sub-millimeter observations
  32. GRB980329 optical observations
  33. GRB980329 near-IR observations
  34. GRB980329 near-IR observations
  35. GRB980326 optical observations
  36. GRB980329 optical observations
  37. GRB980329 VLA observations
  38. GRB980329 optical observations
  39. GRB980329 optical observations
  40. GRB980326 optical observations
  41. GRB980326 optical observations
  42. Optical Observations of GRB 970508
  43. Near-IR follow-up on GRB 971227
  44. Optical Observations of the GRB 971227 field
  45. Optical Observations on GRB 971227
  46. GRB971227: Plaskett R-band observations
  47. GRB 971227: Optical clarifications
  48. GRB971227: Further CAHA R-band images
  49. GRB971227: LOTIS observations
  50. GRB971214: Optical Observations and Calibrations
  51. GRB 971214: Optical Observations
  52. Radio Observations of GRB 971214 at the VLA
  53. GRB 971024: Refined analysis by USNOFS Observations
  54. GRB 971024: KPNO Optical Observations
  55. GRB 970828: Palomar Observations

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