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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

11635 results found.

  1. Fermi Gamma-ray Burst Monitor trigger 742413075/240711744 is not a GRB
  2. GRB 240711A: Fermi GBM Final Real-time Localization
  3. Fermi trigger No 742405878: Global MASTER-Net observations report
  4. Fermi trigger No 742317942: Global MASTER-Net observations report
  5. Fermi GRB 240710A: Global MASTER-Net observations report
  6. GRB 240710A: Fermi GBM Final Real-time Localization
  7. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  8. GRB 240705A: Fermi GBM Final Real-time Localization
  9. IPN triangulation of GRB 240628B (short)
  10. IPN triangulation of GRB 240627A
  11. GRB 240619A: Host galaxy redshift from VLT/X-shooter
  12. The first three GRBs detected by SVOM: GRB 240627B, GRB 240629A and GRB 240702A
  13. GRB 240702A: BALROG localization (Fermi Trigger / GRB 240702885)
  14. Fermi GRB 240702A: Global MASTER-Net observations report
  15. GRB 240702A: Fermi GBM Final Real-time Localization
  16. Fermi Gamma-ray Burst Monitor trigger 741448122/240630575 is not a GRB
  17. Fermi trigger No 741448122: Global MASTER-Net observations report
  18. LIGO/Virgo/KAGRA S240629by: Upper limits from Fermi-GBM Observations
  19. Fermi trigger No 741356809: Global MASTER-Net observations report
  20. Fermi GRB 240629A: Global MASTER-Net observations report
  21. Fermi Gamma-ray Burst Monitor trigger 741362867/240629589 is not a GRB
  22. Fermi Gamma-ray Burst Monitor trigger 741288821/240628732 is not a GRB
  23. GRB 240629A: BALROG localization (Fermi Trigger 741372837 / GRB 240629704)
  24. GRB 240629A: Fermi GBM Final Real-time Localization
  25. Fermi Gamma-ray Burst Monitor trigger 741356809/240629519 is not a GRB
  26. Fermi trigger No 741296200: Global MASTER-Net observations report
  27. Fermi trigger No 741251380: Global MASTER-Net observations report
  28. IPN triangulation of GRB 240619C
  29. GRB 240628A: BALROG localization (Fermi Trigger 741288821 / GRB 240628732)
  30. GRB 240615A: SAI CMO J- band observations
  31. Fermi trigger No 741211696: Global MASTER-Net observations report
  32. Konus-Wind detection of GRB 240619A
  33. Fermi GRB 240625B: Global MASTER-Net observations report
  34. GRB 240624B: CALET Gamma-Ray Burst Monitor detection
  35. GRB 240625B: Fermi GBM Final Real-time Localization
  36. GRB 240625A: Fermi GBM Observation
  37. GRB 240624B: GRBAlpha detection
  38. GRB 240625A: Fermi GBM Final Real-time Localization
  39. GRB240624A: Fermi GBM Observation
  40. GRB240615A: Gemini-North observations of the BAT and XRT positions
  41. Fermi GRB 240624A: Global MASTER-Net observations report
  42. GRB 240624B: Fermi GBM Final Real-time Localization
  43. Fermi trigger No 740949590: Global MASTER-Net observations report
  44. GRB240615A: Gemini-North observations of the BAT and XRT positions
  45. GRB 240624A: Fermi GBM Final Real-time Localization
  46. GRB 240619A: J-band detection with WINTER
  47. Fermi trigger No 740744838: Global MASTER-Net observations report
  48. IPN triangulation of GRB 240615A (short)
  49. X-ray transient EP240618a: Fermi/GBM non-detection
  50. GRB 240619A: GRBAlpha detection
  51. EP240617a: tentative Swift/XRT detection of the afterglow
  52. GRB 240619A: Swift-XRT probable afterglow detection
  53. GRB 240619A: Swift ToO observations
  54. GRB 240619A: CALET Gamma-Ray Burst Monitor detection
  55. GRB 240619C: NuSTAR automated detection of the GRB
  56. GRB 240619A: Fermi GBM Observation
  57. Fermi GBM Sub-Threshold Detection of GRB 240619C
  58. GRB 240619A: GOTO candidate optical afterglow
  59. GRB 240615A: NOT optical observations
  60. Fermi trigger No 740474239: Global MASTER-Net observations report
  61. Fermi GRB 240619A: Global MASTER-Net observations report
  62. Fermi Gamma-ray Burst Monitor trigger 740474239/240619304 is not a GRB
  63. GRB 240619B: Fermi GBM Final Real-time Localization
  64. Fermi trigger No 740430582: Global MASTER-Net observations report
  65. GRB240615A: 1.3m DFOT optical upper limit
  66. GRB 240619A: BALROG localization (Fermi Trigger 740461416 / GRB 240619155)
  67. GRB 240619A: Fermi GBM Final Real-time Localization
  68. EP240617a is likely a GRB event
  69. GRB 240615A: Fermi GBM Observation
  70. GRB 240615A: GECAM detection
  71. GRB 240615A: FLWO-1.2m optical upper limits
  72. Fermi trigger No 740221779: Global MASTER-Net observations report
  73. Fermi GRB 240616A: Global MASTER-Net observations report
  74. Konus-Wind detection of GRB 240615A (short/hard)
  75. GRB 240615A: GOTO optical upper limits
  76. Fermi trigger No 740166710: Global MASTER-Net observations report
  77. GRB 240616A: Fermi GBM Final Real-time Localization
  78. GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
  79. GRB 240615A: Fermi GBM Final Real-time Localization
  80. GRB 240603A: VZLUSAT-2 detection
  81. GRB 240612A: GRBAlpha detection
  82. GRB 240613A: Fermi GBM Final Real-time Localization
  83. Fermi GRB 240612B: Global MASTER-Net observations report
  84. Fermi GRB 240612A: Global MASTER-Net observations report
  85. GRB 240612B: Fermi GBM Final Real-time Localization
  86. GRB 240612A: Fermi GBM Final Real-time Localization
  87. GRB 240607A: GECAM detection of a bright long burst
  88. Fermi GRB 240611A: Global MASTER-Net observations report
  89. Konus-Wind detection of GRB 240607A
  90. GRB 240611A: Fermi GBM Final Real-time Localization
  91. Fermi GRB 240610A: Global MASTER-Net observations report
  92. GRB 240610A: Fermi GBM Final Real-time Localization
  93. IPN triangulation of GRB 240607A
  94. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  95. Fermi trigger No 739632045: Global MASTER-Net observations report
  96. Fermi GRB 240608A: Global MASTER-Net observations report
  97. Konus-Wind detection of GRB 240606B
  98. Fermi trigger No 739506569: Global MASTER-Net observations report
  99. GRB 240608A: Fermi GBM Final Real-time Localization
  100. Fermi GRB 240607A: Global MASTER-Net observations report

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