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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"

14953 results found.

  1. GRB 220701A: BOOTES-5/JGT early optical upper limit
  2. GRB 220701A: Swift detection of a burst
  3. GRB 220624A: AGILE/GRID refined analysis
  4. IceCube-220629A: No significant detection in HAWC
  5. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  6. IceCube-220627A: No significant detection in HAWC
  7. GRB 220627A: Swift-XRT afterglow detection
  8. Konus-Wind detection of GRB 220627A
  9. Trigger 1113743: Swift detection of MAXI J0655-013
  10. GRB 220627A: MeerLICHT candidate optical afterglow
  11. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  12. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  13. Konus-Wind detection of GRB 220624A
  14. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  15. GRB 220627A: Fermi-LAT detection
  16. GRB 220627A: MeerLICHT detection of two afterglow candidates
  17. GRB 220627A: Fermi GBM Final Real-time Localization
  18. IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event
  19. IceCube-220624A: No significant detection in HAWC
  20. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  21. GRB 220624A: Fermi GBM Detection
  22. IPN triangulation of GRB 220624A
  23. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  24. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  25. GRB 220624A: AGILE/GRID analysis
  26. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  27. GRB 220624A: AGILE detection
  28. Konus-Wind detection of GRB 220623A
  29. GRB 220624B: Fermi GBM Final Real-time Localization
  30. GRB 220624A: Fermi GBM Final Real-time Localization
  31. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  32. Konus-Wind detection of GRB 220609B
  33. GRB 220623B: Fermi GBM Final Real-time Localization
  34. GRB 220623A: AGILE detection
  35. GRB 220623A: AstroSat CZTI detection
  36. GRB 220623A: Swift detection of a burst
  37. GRB 220618A: Fermi GBM detection
  38. Swift Detection of MAXI J0655-013
  39. Konus-Wind detection of GRB 220617A
  40. GRB 220620B: Fermi GBM Final Real-time Localization
  41. GRB 220619A: AstroSat CZTI detection
  42. GRB 220620A: Fermi GBM Final Real-time Localization
  43. GRB 220617A: TNG optical observations
  44. Swift Trigger 1110865 is probably not an astrophysical event
  45. GRB 220611A optical counterpart
  46. IPN triangulation of GRB 220617A (short)
  47. GRB 220618A: BOOTES-5/JGT early optical upper limit
  48. GRB 220618A: Swift detection of a burst
  49. GRB 220617A: Fermi-LAT detection
  50. GRB 220617A: Fermi GBM Final Real-time Localization
  51. GRB 220611A: Gemini Ks counterpart detection
  52. Konus-Wind detection of GRB 220613A
  53. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  54. GRB 220611A: Gemini South Infrared Detection
  55. IPN triangulation of GRB 220606C
  56. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  57. GRB 220612A: Swift/BAT-GUANO detection
  58. GRB 220608B: Detection by VZLUSAT-2
  59. GRB 220610B: AstroSat CZTI detection
  60. GRB 220611A: Swift detection of a burst
  61. IPN triangulation of GRB 220609B
  62. GRB 220610A: Fermi GBM Final Real-time Localization
  63. GRB 220609B: AstroSat CZTI detection
  64. GRB 220609B: CALET Gamma-Ray Burst Monitor detection
  65. GRB 220608A: AstroSat CZTI detection
  66. GRB 220609A: Fermi GBM Final Real-time Localization
  67. GRB 220606C: CALET Gamma-Ray Burst Monitor detection
  68. GRB 220608A: Fermi GBM Final Real-time Localization
  69. Konus-Wind detection of GRB 220601A
  70. GRB 220606A: Swift/BAT-GUANO detection
  71. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  72. GRB 220606B: Fermi GBM Final Real-time Localization
  73. GRB 220606A: Fermi GBM Final Real-time Localization
  74. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  75. GRB 220527A: MITSuME Akeno continued optical observation
  76. GRB 220527A: Lick 3m Optical Observations
  77. Konus-Wind detection of GRB 220528A
  78. IPN triangulation of GRB 220528A (short)
  79. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  80. Konus-Wind observation of GRB 220527A
  81. GRB 220530A: Fermi GBM Final Real-time Localization
  82. Correction to GCN 32148: Should be GRB 220528A
  83. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  84. GRB 220528A: Fermi GBM Final Localization
  85. GRB 220527A: AST3-3 Yaoan Optical Observation
  86. GRB 220527A: REM optical/NIR observations
  87. GRB 220527A: VLT/X-shooter spectroscopic redshift
  88. GRB 220527A: MeerLICHT afterglow observations
  89. GRB 220527A: AstroSat CZTI detection
  90. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  91. GRB 220527A: MITSuME Akeno optical observation
  92. GRB 220527A: Swift/UVOT detection
  93. GRB 220527A: Swift-XRT afterglow detection
  94. GRB 220527A: Fermi-LAT detection
  95. GRB 220527A: Fermi GBM Final Localization
  96. GRB 220527A: AGILE detection
  97. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  98. GRB 220525A: Fermi GBM Detection
  99. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  100. GRB 220525A: CALET Gamma-Ray Burst Monitor detection

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