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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"

20357 results found.

  1. SGR1627-41, RXTE/ASM observations
  2. GRB 980613: Detection of the probable host galaxy
  3. GRB 980613 Optical Observations
  4. GRB 980613 optical observations
  5. Discovery of a new SGR source, SGR1627-41
  6. GRB980613 Optical Observations
  7. GRB980613 observations from Palomar
  8. GRB 980613 optical/IR obs.
  9. GRB980613 Near Infra-Red Observations
  10. GRB980613, BeppoSAX WFC positions
  11. GRB971214 Secondary Standards
  12. GRB980519 Secondary Standards
  13. SGR1900+14
  14. SGR1900+14
  15. BATSE on-board GRB trigger change
  16. GRB 980519 Optical Observations
  17. GRB 980519
  18. GRB980519 optical observations
  19. GRB 980519 Optical Observations
  20. GRB970519, optical follow-up at Schmidt Calern
  21. GRB980519 Optical Observations
  22. GRB 980519 Optical Observations
  23. GRB980519 optical observations
  24. GRB980515, BeppoSAX IAUC to be submitted
  25. BATSE on-board GRB trigger change
  26. GRB980515: SAX-WFC updated position
  27. BSAX Observations of GRB980425 field
  28. IPN web site of GRBs
  29. SAX J0840.7+2248 Optical Observations
  30. GRB980425: optical obs.
  31. GRB980425: Radio Observations
  32. report on BSAX observations of GRB980425
  33. GRB980326 X-ray Observations
  34. GRB980326, optical observations
  35. GRB980326, optical observations
  36. GRB980329 Keck K-band observations
  37. GRB980329 sub-millimeter observations
  38. GRB980326 optical observations
  39. GRB980329 optical observations
  40. GRB980329 VLA observations
  41. GRB980329 optical observations
  42. GRB980326 optical observations
  43. GRB970508 SAO RAS optical observations
  44. Optical Observations of GRB 970508
  45. Near-IR follow-up on GRB 971227
  46. Optical Observations of the GRB 971227 field
  47. Optical Observations on GRB 971227
  48. GRB971227: Plaskett R-band observations
  49. GRB 971227: Optical clarifications
  50. GRB971227: Further CAHA R-band images
  51. GRB971227: LOTIS observations
  52. GRB971214: Optical Observations and Calibrations
  53. GRB 971214: Optical Observations
  54. Radio Observations of GRB 971214 at the VLA
  55. GRB 971024: KPNO Optical Observations
  56. GRB 970828: Palomar Observations
  57. GRB 970228: Keck/LRIS Optical Observations

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