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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"

20358 results found.

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

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