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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"

23151 results found.

  1. GRB980613 Near Infra-Red Observations
  2. GRB971214 Secondary Standards
  3. SGR 1900+14
  4. SGR1900+14
  5. SGR1900+14
  6. GRB980519 optical observations
  7. GRB980519 Optical Observations
  8. GRB980519 optical observations
  9. GRB980515, BeppoSAX IAUC to be submitted
  10. GRB 980425 Radio Light Curve
  11. GRB 980425 Brightness Temperature
  12. GRB980425 BATSE observations
  13. GRB980425: Radio Observations
  14. GRB 980425 optical observations
  15. report on BSAX observations of GRB980425
  16. GRB 980425 optical observations
  17. GRB980326, optical observations
  18. GRB980329, Fading IR counterpart to radio source
  19. GRByymmdd, Announcement of automation
  20. GRB980326 IPN annulus
  21. GRB980329
  22. GRB980329 IPN annulus
  23. GRB980329 optical observations
  24. GRB980329 near-IR observations
  25. GRB980329 near-IR observations
  26. GRB980329 optical observations
  27. GRB980329 infrared observations
  28. GRB980329 optical observations
  29. GRB980326 optical observations
  30. GRB980329 optical observations
  31. GRB980329 near IR observations
  32. GRB980329 optical observations
  33. GRB980329 optical observations
  34. GRB980329 optical observations
  35. GRB980326 optical observations
  36. GRB970508 SAO RAS optical observations
  37. Near-IR follow-up on GRB 971227
  38. GRB971227: Plaskett R-band observations
  39. GRB 971227: Optical clarifications
  40. GRB971227: Further CAHA R-band images
  41. GRB971227: LOTIS observations
  42. GRB 971227: CAHA R-band images
  43. GRB971214: Optical Observations and Calibrations
  44. GRB 971214: EUVE Observations
  45. GRB 971214: Redshift from Keck Optical Observations
  46. GRB 971214: Redshift from Keck Optical Observations
  47. Optical Observations of GRB 971214 at Keck
  48. GRB 971214: Optical Observations
  49. GRB 971024: Refined analysis by USNOFS Observations
  50. GRB 971024: USNO Observations
  51. IRAS 18119-1342 and the possible new SGR

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