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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"

37549 results found.

  1. GRB 130831B: GROND upper limits
  2. Swift Trigger 569022: a possible GRB
  3. GRB 130831A: THO optical observation
  4. GRB 130831A, Swift-BAT refined analysis
  5. GRB 130831B: Swift-XRT refined Analysis
  6. GRB 130831A: optical observations
  7. GRB 130831A: Optical Observations via Virtual Telescope
  8. GRB 130831A: Swift-XRT refined Analysis
  9. GRB 130831A: Montarrenti Observatory optical observations
  10. GRB 130831B: Enhanced Swift-XRT position
  11. GRB 130831A: Skynet/PROMPT-SSO detections
  12. GRB 130831A: Enhanced Swift-XRT position
  13. GRB 130831A : Xinglong 60cm optical observation
  14. Konus-Wind observation of GRB 130831A
  15. GRB 130831A: Gemini-North Redshift
  16. GRB 130831A: MITSuME Akeno Optical observation
  17. GRB 130831A: Weihai optical observations
  18. GRB 130831B: Swift detection of a burst
  19. GRB 130831A: Faulkes Telescope North and South optical afterglow
  20. GRB 130831A: Swift detection of a burst with an optical counterpart
  21. IPN triangulation of GRB 130828A - error box
  22. GRB 130822A: optical upper limits
  23. GRB 130829A: AAO optical observations
  24. GRB 130828A: Swift XRT and UVOT observations
  25. GRB 130829A: NOT optical observations
  26. Correction to GCN 15132 - GRB 130828A
  27. IPN triangulation of GRB 130828A
  28. GRB 130829A: Swift detection of a burst
  29. GRB 130828A Tiled Swift observations
  30. GRB 130828A: Fermi GBM detection
  31. GRB 130828A: Fermi-LAT detection of a burst
  32. IPN triangulation of GRB130821A
  33. GRB 130822A Swift-BAT Spectral lag analysis
  34. Konus-Wind observation of GRB 130821A
  35. GRB 130821A: Weihai optical upper limit
  36. GRB 130821A: Swift-XRT observation
  37. GRB 130822A: 5.8 GHz VLA upper limit
  38. GRB 130822A: Gemini Observations
  39. GRB 130822A: Swift-XRT refined Analysis
  40. GRB 130822A: WHT ACAM observations
  41. GRB 130822A: Swift/UVOT Upper Limits
  42. GRB 130822A: Enhanced Swift-XRT position
  43. GRB 130822A, Swift-BAT refined analysis
  44. GRB 130821A: Fermi-LAT detection of a burst
  45. GRB 130822A: Weihai optical upper limit
  46. GRB 130821A: Fermi GBM Detection
  47. GRB 130822A: Swift detection of a short burst
  48. GRB 130816A: Swift/UVOT Upper Limits
  49. GRB 130816B: Swift/UVOT Upper Limits
  50. Fermi Gamma-ray Burst Monitor trigger 398555975 / 130818916 is not a GRB
  51. GRB 130816B, Swift-BAT refined analysis
  52. GRB 130816B: GROND afterglow candidate
  53. GRB 130816A: Swift-XRT refined Analysis
  54. GRB 130816A, Swift-BAT refined analysis
  55. GRB 130816A: Fermi GBM observation
  56. GRB 130816B: Swift-XRT refined Analysis
  57. GRB 130816B: Enhanced Swift-XRT position
  58. GRB 130816A: GROND confirmation of afterglow
  59. GRB 130816A: Enhanced Swift-XRT position
  60. GRB 130816B: Swift detection of a burst
  61. GRB 130816A: REM NIR candidate afterglow
  62. GRB 130816A: Swift detection of a burst
  63. Refined IPN Triangulation of GRB 130812B
  64. Konus-Wind observation of GRB 130812B
  65. IPN Triangulation of GRB 130812B (long/soft)
  66. GRB 130812A: Swift/UVOT Upper Limits
  67. GRB 130812A, Swift-BAT refined analysis
  68. GRB 130812A: GROND upper limits
  69. GRB 130812A: Swift-XRT refined Analysis
  70. GRB 130812A: Enhanced Swift-XRT position
  71. GRB 130812A: Swift detection of a burst
  72. GRB130807A: Swift/UVOT observations
  73. GRB 130807A: Swift-XRT refined analysis
  74. GRB 130806A: Swift/UVOT Upper Limits
  75. GRB 130807A, Swift-BAT refined analysis
  76. GRB 130807A: Swift detection of a GRB or Galactic transient
  77. Konus-Wind observation of GRB 130804A
  78. GRB 130623A: GROND detection of the optical/NIR afterglow
  79. GRB 130806A: MITSuME Akeno Optical observation
  80. GRB 130806A: Swift-XRT refined Analysis
  81. GRB 130806A: MITSuME Okayama upper limits
  82. GRB 130806A, Swift-BAT refined analysis
  83. IPN localization of GRB 130804A
  84. GRB130803A: GROND observations
  85. GRB 130806A: Enhanced Swift-XRT position
  86. GRB 130806A: Swift detection of a burst
  87. GRB 130804A; Fermi GBM observation
  88. GRB 130803A: Swift-XRT refined Analysis
  89. GRB 130803A: RATIR Optical and NIR Observations
  90. GRB130803A: GROND detection of possible host
  91. GRB 130803A: Swift/UVOT Upper Limits
  92. GRB 130803A; Fermi GBM observation
  93. GRB 130803A, Swift-BAT refined analysis
  94. GRB 130803A: Enhanced Swift-XRT position
  95. GRB 130803A: Faulkes Telescope South Observations
  96. GRB 130603B: Second epoch of HST WFC/F160W imaging
  97. GRB 130803A: Swift detection of a burst
  98. GRB 130727A: Watcher optical limit
  99. GRB 130722A: RATIR Optical Observations
  100. GRB 130727A: Swift/UVOT Detection

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