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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"

11512 results found.

  1. GRB 220210A: Fermi GBM detection
  2. Fermi GRB 220211B: Global MASTER-Net observations report
  3. GRB 220211B: Fermi GBM Final Real-time Localization
  4. GRB 220209A: Fermi-LAT detection
  5. GRB 220210A: Fermi-LAT detection
  6. GRB 220210A: AGILE detection
  7. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  8. GRB 220210A: Swift/BAT-GUANO localization
  9. Fermi GRB 220211A: Global MASTER-Net observations report
  10. GRB 220211A: Fermi GBM Final Real-time Localization
  11. Fermi GRB 220210A: Global MASTER-Net observations report
  12. GRB 220210A: Fermi GBM Final Real-time Localization
  13. GRB 220209A: Fermi GBM Detection
  14. GRB 220209A: GECAM detection
  15. GRB 220209A: AGILE/MCAL detection
  16. Fermi GRB 220209A: Global MASTER-Net observations report
  17. GRB 220209A: Fermi GBM Final Real-time Localization
  18. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  19. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  20. Konus-Wind detection of GRB 220130A
  21. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  22. IceCube-220205A - IceCube observation of a high-energy neutrino candidate track-like event
  23. IPN triangulation of GRB 220130A
  24. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  25. IceCube-220202A: IceCube observation of a high-energy neutrino candidate track-like event
  26. GRB 220201A: Fermi GBM Final Localization
  27. GRB 220130A: Fermi GBM Observation
  28. Fermi GRB 220131A: Global MASTER-Net observations report
  29. GRB 220131A: Fermi GBM Final Real-time Localization
  30. Fermi GRB 220129A: Global MASTER-Net observations report
  31. GRB 220129A: Fermi GBM Final Real-time Localization
  32. GRB 220124A: GECAM detection
  33. Fermi trigger No 664738369: Global MASTER-Net observations report
  34. GRB 220117A: Terskol and AbAO optical upper limits
  35. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  36. Fermi-LAT-ANTARES 220121a Coincidence
  37. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  38. GRB 220120A: Fermi GBM Final Localization
  39. GRB 220117C: Fermi GBM Observation
  40. GRB 220118A: 2.2m CAHA/CAFOS detections
  41. GRB 220118A: Fermi GBM detection
  42. GRB 220118A: COATLI Optical Observations
  43. GRB 220117C: Swift/BAT-GUANO arcminute localization
  44. GRB 220118A: GIT optical observations
  45. GRB 220118A: MITSuME Akeno optical observation
  46. GRB 220118A: Fermi GBM Final Real-time Localization
  47. Fermi GBM Sub-Threshold Detection of GRB 220117A
  48. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  49. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  50. Fermi trigger No 663960124: Global MASTER-Net observations report
  51. Fermi trigger No 663967527: Global MASTER-Net observations report
  52. Fermi trigger No 663923149: Global MASTER-Net observations report
  53. Fermi trigger No 663899819: Global MASTER-Net observations report
  54. Fermi trigger No 663886592: Global MASTER-Net observations report
  55. Fermi trigger No 663966693: Global MASTER-Net observations report
  56. GRB 220115B: Fermi GBM Final Real-time Localization
  57. Fermi trigger No 663927396: Global MASTER-Net observations report
  58. Fermi trigger No 663921434: Global MASTER-Net observations report
  59. GRB 220115A: Fermi GBM Final Real-time Localization
  60. IceCube-220115A - IceCube observation of a high-energy neutrino candidate track-like event
  61. Fermi Gamma-ray Burst Monitor trigger 663917434/220115230 is not a GRB
  62. GRB 220114A: Fermi GBM Final Localization
  63. Fermi trigger No 663763320: Global MASTER-Net observations report
  64. Fermi trigger No 663710289: Global MASTER-Net observations report
  65. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  66. Fermi trigger No 663669570: Global MASTER-Net observations report
  67. GRB 220111A: AstroSat CZTI detection
  68. Fermi trigger No 663658976: Global MASTER-Net observations report
  69. Fermi trigger No 663618072: Global MASTER-Net observations report
  70. Fermi GRB 220111A: Global MASTER-Net observations report
  71. GRB 220111A: BALROG localization (Fermi Trigger 663621714 / GRB 220111807)
  72. GRB 220111A: Fermi GBM Final Real-time Localization
  73. Konus-Wind detection of GRB 220101A
  74. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  75. GRB 220107A: SAO RAS optical observations
  76. Konus-Wind detection of GRB 220107B
  77. Konus-Wind detection of GRB 220107A
  78. Confirmation of the X-ray afterglow of GRB 220107B
  79. GRB 220107A: further SAO RAS optical observations
  80. Fermi trigger No 663406755: Global MASTER-Net observations report
  81. GRB 220107A: 6m BTA spectroscopic redshift
  82. GRB 220107A: SAO RAS optical observations
  83. GRB 220101A: SAO RAS optical observations
  84. GRB 220107A: AbAO and Terskol optical observations
  85. GRB 220107B: MITSuME Akeno optical upper limits
  86. GRB 220107B: Nanshan/NEXT optical upper limits and host galaxy candidate
  87. GRB 220107A: Nanshan/NEXT optical observations
  88. GRB 220107A: Swift/UVOT Detection
  89. GRB 220107B: Fermi GBM observations
  90. GRB 220107A: MITSuME Akeno optical observation
  91. GRB 220107B: AstroSat CZTI detection
  92. GRB 220107B: Swift-XRT afterglow detection
  93. GRB 220107B: Fermi-LAT detection
  94. GRB 220107A: AstroSat CZTI detection
  95. GRB 220107B: Tiled Swift observations
  96. GRB 220107A: Fermi GBM observations
  97. Fermi trigger No 663274898: Global MASTER-Net observations report
  98. Fermi GRB 220107A: Global MASTER-Net observations report
  99. GRB 220107A: Swift/BAT-GUANO arcminute localization
  100. GRB 220107A: BALROG localization (Fermi Trigger 663259536 / GRB 220107615)

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