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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"

22854 results found.

  1. Discovery of a new SGR source, SGR1627-41
  2. GRB980613 Optical Observations
  3. GRB980613 observations from Palomar
  4. GRB980613 Near Infra-Red Observations
  5. GRB971214 Secondary Standards
  6. GRB980519 Secondary Standards
  7. BATSE on-board GRB trigger change
  8. GRB 980519 Optical Observations
  9. GRB980519 optical observations
  10. GRB 980519
  11. GRB980519 optical observations
  12. GRB 980519 Optical Observations
  13. GRB980519 Optical Observations
  14. GRB 980519 Optical Observations
  15. GRB980515, BeppoSAX IAUC to be submitted
  16. BATSE on-board GRB trigger change
  17. GRB980519, BeppoSAX-WFC updated position
  18. GRB980515: SAX-WFC updated position
  19. GRB 980425 Radio Light Curve
  20. BSAX Observations of GRB980425 field
  21. IPN web site of GRBs
  22. SAX J0840.7+2248 Optical Observations
  23. GRB980425: optical obs.
  24. GRB980425: Radio Observations
  25. report on BSAX observations of GRB980425
  26. GRB 980329 ROSAT observation
  27. GRB980326 X-ray Observations
  28. GRB980326, optical observations
  29. GRB980326, optical observations
  30. GRB980329
  31. GRB980329 Keck K-band observations
  32. GRB980326 optical observations
  33. GRB980329 optical observations
  34. GRB980329 VLA observations
  35. GRB980329 optical observations
  36. GRB980326 optical observations
  37. GRB980326 optical observations
  38. GRB980326 optical observations
  39. Optical Observations of GRB 970508
  40. Near-IR follow-up on GRB 971227
  41. Optical Observations of the GRB 971227 field
  42. Optical Observations on GRB 971227
  43. GRB971227: Plaskett R-band observations
  44. GRB 971227: Optical clarifications
  45. GRB971227: Further CAHA R-band images
  46. GRB971227: LOTIS observations
  47. GRB971214: Optical Observations and Calibrations
  48. Sub-millimeter Observations of GRB 971214 at the JCMT
  49. GRB 971214: EUVE Observations
  50. GRB 971214: KPNO Optical Observations
  51. GRB 971214: Optical Observations
  52. Radio Observations of GRB 971214 at the VLA
  53. GRB 971024: KPNO Optical Observations
  54. GRB 970828: Palomar Observations

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