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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"

26164 results found.

  1. SGR1900+14 field optical observations
  2. GRB980613, optical observations
  3. GRB 980613: Optical transient and its host galaxy
  4. SGR1627-41, RXTE/ASM observations
  5. GRB 980613: Detection of the probable host galaxy
  6. Reduced error box of SGR 1627-41
  7. GRB 980613: BATSE Observations
  8. GRB 980613 Optical Observations
  9. GRB 980613 optical observations
  10. Discovery of a new SGR source, SGR1627-41
  11. GRB980613 Optical Observations
  12. GRB980613 observations from Palomar
  13. GRB 980613 optical/IR obs.
  14. GRB980613 Near Infra-Red Observations
  15. GRB971214 Secondary Standards
  16. GRB980519 Secondary Standards
  17. BATSE on-board GRB trigger change
  18. GRB 980519 Optical Observations
  19. GRB 980519
  20. GRB980519 optical observations
  21. GRB 980519 Optical Observations
  22. GRB980519 BATSE Observations
  23. GRB980519 Optical Observations
  24. GRB980519 Optical Observations
  25. GRB 980519 Optical Observations
  26. GRB980515, BeppoSAX IAUC to be submitted
  27. BSAX Observations of GRB980425 field
  28. IPN web site of GRBs
  29. GRB980425 BATSE observations
  30. SAX J0840.7+2248 Optical Observations
  31. GRB980425: optical obs.
  32. GRB980425: Radio Observations
  33. report on BSAX observations of GRB980425
  34. GRB 980329 ROSAT observation
  35. GRB980326 X-ray Observations
  36. GRB980326, optical observations
  37. GRB980326, optical observations
  38. GRB980329, Fading IR counterpart to radio source
  39. GRB980329 Keck K-band observations
  40. GRB980329 sub-millimeter observations
  41. GRB980329 optical observations
  42. GRB980329 near-IR observations
  43. GRB980329 near-IR observations
  44. GRB980326 optical observations
  45. GRB980329 optical observations
  46. GRB980329 VLA observations
  47. GRB980329 optical observations
  48. GRB980329 optical observations
  49. GRB980326 optical observations
  50. GRB980326 optical observations
  51. Optical Observations of GRB 970508
  52. Near-IR follow-up on GRB 971227
  53. Optical Observations of the GRB 971227 field
  54. Optical Observations on GRB 971227
  55. GRB971227: Plaskett R-band observations
  56. GRB 971227: Optical clarifications
  57. GRB971227: Further CAHA R-band images
  58. GRB971227: LOTIS observations
  59. GRB971214: Optical Observations and Calibrations
  60. GRB 971214: Optical Observations
  61. Radio Observations of GRB 971214 at the VLA
  62. GRB 971024: Refined analysis by USNOFS Observations
  63. GRB 971024: KPNO Optical Observations
  64. GRB 970828: Palomar Observations

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