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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"

37579 results found.

  1. Fermi trigger No 741356809: Global MASTER-Net observations report
  2. Fermi GRB 240629A: Global MASTER-Net observations report
  3. Fermi Gamma-ray Burst Monitor trigger 741362867/240629589 is not a GRB
  4. Fermi Gamma-ray Burst Monitor trigger 741288821/240628732 is not a GRB
  5. GRB 240629A: BALROG localization (Fermi Trigger 741372837 / GRB 240629704)
  6. GRB 240629A: Fermi GBM Final Real-time Localization
  7. Fermi Gamma-ray Burst Monitor trigger 741356809/240629519 is not a GRB
  8. Fermi trigger No 741296200: Global MASTER-Net observations report
  9. Fermi trigger No 741251380: Global MASTER-Net observations report
  10. IPN triangulation of GRB 240619C
  11. GRB 240628A: BALROG localization (Fermi Trigger 741288821 / GRB 240628732)
  12. GRB 240627A: NuSTAR Detection of the long GRB
  13. GRB 240615A: SAI CMO J- band observations
  14. GRB 240627A: AstroSat CZTI detection
  15. Fermi trigger No 741211696: Global MASTER-Net observations report
  16. EP240626a: Montarrenti Observatory optical upper limit
  17. EP240626a: KAIT optical upper limit
  18. GRB 240624A: Swift-BAT refined analysis
  19. Konus-Wind detection of GRB 240619A
  20. Fermi GRB 240625B: Global MASTER-Net observations report
  21. GRB 240624B: CALET Gamma-Ray Burst Monitor detection
  22. GRB 240625B: Fermi GBM Final Real-time Localization
  23. GRB 240625A: Fermi GBM Observation
  24. GRB 240624B: GRBAlpha detection
  25. GRB 240625A: Fermi GBM Final Real-time Localization
  26. GRB240624A: Fermi GBM Observation
  27. LIGO/Virgo/KAGRA S240622h: Upper limits from Swift/BAT-GUANO
  28. LIGO/Virgo/KAGRA S240621dy: Upper limits from Swift/BAT-GUANO
  29. LIGO/Virgo/KAGRA S240618ah: Upper limits from Swift/BAT-GUANO
  30. Swift GRB 240624A: Global MASTER-Net observations report
  31. GRB240615A: Gemini-North observations of the BAT and XRT positions
  32. Fermi GRB 240624A: Global MASTER-Net observations report
  33. GRB 240624B: Fermi GBM Final Real-time Localization
  34. Fermi trigger No 740949590: Global MASTER-Net observations report
  35. GRB240615A: Gemini-North observations of the BAT and XRT positions
  36. GRB 240624A: Fermi GBM Final Real-time Localization
  37. GRB 240619A: detection of a radio counterpart with AMI-LA
  38. GRB 240624A: Swift detection of a burst
  39. GRB 240619A: J-band detection with WINTER (duplicate submission of GCN 36739)
  40. GRB 240619A: J-band detection with WINTER
  41. Fermi trigger No 740744838: Global MASTER-Net observations report
  42. EP240618a: NOT optical counterpart candidate
  43. GRB 240529A: JinShan optical observations
  44. IPN triangulation of GRB 240615A (short)
  45. X-ray transient EP240618a: Fermi/GBM non-detection
  46. GRB 240619A: GRBAlpha detection
  47. EP240617a: tentative Swift/XRT detection of the afterglow
  48. GRB 240619A: Swift-XRT probable afterglow detection
  49. GRB 240619A: Swift ToO observations
  50. GRB 240619A: CALET Gamma-Ray Burst Monitor detection
  51. GRB 240619C: NuSTAR automated detection of the GRB
  52. GRB 240619A: Fermi GBM Observation
  53. Fermi GBM Sub-Threshold Detection of GRB 240619C
  54. GRB 240619A: GOTO candidate optical afterglow
  55. EP240618a: Abastumani optical observationsEP240618a
  56. GRB 240615A: NOT optical observations
  57. GRB 240619C: AstroSat CZTI detection
  58. Fermi trigger No 740474239: Global MASTER-Net observations report
  59. Fermi GRB 240619A: Global MASTER-Net observations report
  60. GRB 240615A: possible transient detection from Wendelstein observations
  61. Fermi Gamma-ray Burst Monitor trigger 740474239/240619304 is not a GRB
  62. GRB 240619B: Fermi GBM Final Real-time Localization
  63. Fermi trigger No 740430582: Global MASTER-Net observations report
  64. GRB240615A: 1.3m DFOT optical upper limit
  65. GRB 240619A: BALROG localization (Fermi Trigger 740461416 / GRB 240619155)
  66. GRB 240619A: Fermi GBM Final Real-time Localization
  67. EP240617a: BOOTES-6/DPRT optical upper limit
  68. EP240617a is likely a GRB event
  69. LIGO/Virgo/KAGRA S240615ea: Upper limits from Swift/BAT-GUANO
  70. LIGO/Virgo/KAGRA S240615dg: Upper limits from Swift/BAT-GUANO
  71. GRB 240615A: J-band upper limits from WINTER
  72. GRB 240615A: Fermi GBM Observation
  73. GRB 240615A: Swift-XRT observations
  74. GRB 240615A: GECAM detection
  75. GRB 240615A: FLWO-1.2m optical upper limits
  76. Fermi trigger No 740221779: Global MASTER-Net observations report
  77. Fermi GRB 240616A: Global MASTER-Net observations report
  78. Konus-Wind detection of GRB 240615A (short/hard)
  79. GRB 240615A: GOTO optical upper limits
  80. Fermi trigger No 740166710: Global MASTER-Net observations report
  81. GRB 240616A: Fermi GBM Final Real-time Localization
  82. GRB 240615A: Swift ToO observations
  83. GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
  84. GRB 240615A: Fermi GBM Final Real-time Localization
  85. GRB 240603A: VZLUSAT-2 detection
  86. GRB 240612A: GRBAlpha detection
  87. GRB 240613A: Fermi GBM Final Real-time Localization
  88. Fermi GRB 240612B: Global MASTER-Net observations report
  89. Fermi GRB 240612A: Global MASTER-Net observations report
  90. GRB 240612B: Fermi GBM Final Real-time Localization
  91. GRB 240612A: Fermi GBM Final Real-time Localization
  92. GRB 240607A: GECAM detection of a bright long burst
  93. Fermi GRB 240611A: Global MASTER-Net observations report
  94. Konus-Wind detection of GRB 240607A
  95. GRB 240611A: Fermi GBM Final Real-time Localization
  96. GRB 240529A: LBT optical detection and late temporal decay
  97. GRB 240529A : MITSuME Akeno optical afterglow detection
  98. Fermi GRB 240610A: Global MASTER-Net observations report
  99. GRB 240610A: Fermi GBM Final Real-time Localization
  100. IPN triangulation of GRB 240607A

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