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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"

37565 results found.

  1. Fermi trigger No 741211696: Global MASTER-Net observations report
  2. EP240626a: Montarrenti Observatory optical upper limit
  3. EP240626a: KAIT optical upper limit
  4. GRB 240624A: Swift-BAT refined analysis
  5. Konus-Wind detection of GRB 240619A
  6. Fermi GRB 240625B: Global MASTER-Net observations report
  7. GRB 240624B: CALET Gamma-Ray Burst Monitor detection
  8. GRB 240625B: Fermi GBM Final Real-time Localization
  9. GRB 240625A: Fermi GBM Observation
  10. GRB 240624B: GRBAlpha detection
  11. GRB 240625A: Fermi GBM Final Real-time Localization
  12. GRB240624A: Fermi GBM Observation
  13. LIGO/Virgo/KAGRA S240622h: Upper limits from Swift/BAT-GUANO
  14. LIGO/Virgo/KAGRA S240621dy: Upper limits from Swift/BAT-GUANO
  15. LIGO/Virgo/KAGRA S240618ah: Upper limits from Swift/BAT-GUANO
  16. Swift GRB 240624A: Global MASTER-Net observations report
  17. GRB240615A: Gemini-North observations of the BAT and XRT positions
  18. Fermi GRB 240624A: Global MASTER-Net observations report
  19. GRB 240624B: Fermi GBM Final Real-time Localization
  20. Fermi trigger No 740949590: Global MASTER-Net observations report
  21. GRB240615A: Gemini-North observations of the BAT and XRT positions
  22. GRB 240624A: Fermi GBM Final Real-time Localization
  23. GRB 240619A: detection of a radio counterpart with AMI-LA
  24. GRB 240624A: Swift detection of a burst
  25. GRB 240619A: J-band detection with WINTER (duplicate submission of GCN 36739)
  26. GRB 240619A: J-band detection with WINTER
  27. Fermi trigger No 740744838: Global MASTER-Net observations report
  28. EP240618a: NOT optical counterpart candidate
  29. GRB 240529A: JinShan optical observations
  30. IPN triangulation of GRB 240615A (short)
  31. X-ray transient EP240618a: Fermi/GBM non-detection
  32. GRB 240619A: GRBAlpha detection
  33. EP240617a: tentative Swift/XRT detection of the afterglow
  34. GRB 240619A: Swift-XRT probable afterglow detection
  35. GRB 240619A: Swift ToO observations
  36. GRB 240619A: CALET Gamma-Ray Burst Monitor detection
  37. GRB 240619C: NuSTAR automated detection of the GRB
  38. GRB 240619A: Fermi GBM Observation
  39. Fermi GBM Sub-Threshold Detection of GRB 240619C
  40. GRB 240619A: GOTO candidate optical afterglow
  41. EP240618a: Abastumani optical observationsEP240618a
  42. GRB 240615A: NOT optical observations
  43. GRB 240619C: AstroSat CZTI detection
  44. Fermi trigger No 740474239: Global MASTER-Net observations report
  45. Fermi GRB 240619A: Global MASTER-Net observations report
  46. GRB 240615A: possible transient detection from Wendelstein observations
  47. Fermi Gamma-ray Burst Monitor trigger 740474239/240619304 is not a GRB
  48. GRB 240619B: Fermi GBM Final Real-time Localization
  49. Fermi trigger No 740430582: Global MASTER-Net observations report
  50. GRB240615A: 1.3m DFOT optical upper limit
  51. GRB 240619A: BALROG localization (Fermi Trigger 740461416 / GRB 240619155)
  52. GRB 240619A: Fermi GBM Final Real-time Localization
  53. EP240617a: BOOTES-6/DPRT optical upper limit
  54. EP240617a is likely a GRB event
  55. LIGO/Virgo/KAGRA S240615ea: Upper limits from Swift/BAT-GUANO
  56. LIGO/Virgo/KAGRA S240615dg: Upper limits from Swift/BAT-GUANO
  57. GRB 240615A: J-band upper limits from WINTER
  58. GRB 240615A: Fermi GBM Observation
  59. GRB 240615A: Swift-XRT observations
  60. GRB 240615A: GECAM detection
  61. GRB 240615A: FLWO-1.2m optical upper limits
  62. Fermi trigger No 740221779: Global MASTER-Net observations report
  63. Fermi GRB 240616A: Global MASTER-Net observations report
  64. Konus-Wind detection of GRB 240615A (short/hard)
  65. GRB 240615A: GOTO optical upper limits
  66. Fermi trigger No 740166710: Global MASTER-Net observations report
  67. GRB 240616A: Fermi GBM Final Real-time Localization
  68. GRB 240615A: Swift ToO observations
  69. GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
  70. GRB 240615A: Fermi GBM Final Real-time Localization
  71. GRB 240603A: VZLUSAT-2 detection
  72. GRB 240612A: GRBAlpha detection
  73. GRB 240613A: Fermi GBM Final Real-time Localization
  74. Fermi GRB 240612B: Global MASTER-Net observations report
  75. Fermi GRB 240612A: Global MASTER-Net observations report
  76. GRB 240612B: Fermi GBM Final Real-time Localization
  77. GRB 240612A: Fermi GBM Final Real-time Localization
  78. GRB 240607A: GECAM detection of a bright long burst
  79. Fermi GRB 240611A: Global MASTER-Net observations report
  80. Konus-Wind detection of GRB 240607A
  81. GRB 240611A: Fermi GBM Final Real-time Localization
  82. GRB 240529A: LBT optical detection and late temporal decay
  83. GRB 240529A : MITSuME Akeno optical afterglow detection
  84. Fermi GRB 240610A: Global MASTER-Net observations report
  85. GRB 240610A: Fermi GBM Final Real-time Localization
  86. IPN triangulation of GRB 240607A
  87. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  88. Fermi trigger No 739632045: Global MASTER-Net observations report
  89. Fermi GRB 240608A: Global MASTER-Net observations report
  90. Konus-Wind detection of GRB 240606B
  91. Fermi trigger No 739506569: Global MASTER-Net observations report
  92. GRB 240608A: Fermi GBM Final Real-time Localization
  93. Fermi GRB 240607A: Global MASTER-Net observations report
  94. GRB 240529A: NOEMA detection
  95. GRB 240607A: Fermi GBM Observation
  96. GRB 240606B: Fermi GBM Observation
  97. Swift Trigger 1235109: consistent with noise and not astrophysical
  98. GRB 240607A: AstroSat CZTI detection of bright long burst
  99. GRB 240607A: Fermi GBM detection of a very bright burst
  100. GRB 240529A: radio detection with AMI-LA

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