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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"

14966 results found.

  1. GRB 220708B: Swift-XRT afterglow detection
  2. GRB 220708A: BOOTES-5/JGT early optical upper limit
  3. GRB 220708A: Swift detection of a burst
  4. GRB 220627A: ATCA detection of radio counterpart
  5. GRB 220706A: Optical observations from NOT
  6. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  7. GRB 220702B: AstroSat CZTI detection
  8. GRB 220706A: Swift detection of a burst
  9. GRB 220702B: Fermi GBM Final Localization
  10. GRB 220702A: Fermi GBM Final Localization
  11. GRB 220705A: Fermi GBM Final Localization
  12. GRB 220701A: AbAO optical upper limit
  13. GRB 220627A: AstroSat CZTI detection
  14. GRB 220701A: BOOTES-5/JGT early optical upper limit
  15. GRB 220701A: Swift detection of a burst
  16. GRB 220624A: AGILE/GRID refined analysis
  17. IceCube-220629A: No significant detection in HAWC
  18. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  19. IceCube-220627A: No significant detection in HAWC
  20. GRB 220627A: Swift-XRT afterglow detection
  21. Konus-Wind detection of GRB 220627A
  22. Trigger 1113743: Swift detection of MAXI J0655-013
  23. GRB 220627A: MeerLICHT candidate optical afterglow
  24. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  25. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  26. Konus-Wind detection of GRB 220624A
  27. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  28. GRB 220627A: Fermi-LAT detection
  29. GRB 220627A: MeerLICHT detection of two afterglow candidates
  30. GRB 220627A: Fermi GBM Final Real-time Localization
  31. IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event
  32. IceCube-220624A: No significant detection in HAWC
  33. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  34. GRB 220624A: Fermi GBM Detection
  35. IPN triangulation of GRB 220624A
  36. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  37. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  38. GRB 220624A: AGILE/GRID analysis
  39. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  40. GRB 220624A: AGILE detection
  41. Konus-Wind detection of GRB 220623A
  42. GRB 220624B: Fermi GBM Final Real-time Localization
  43. GRB 220624A: Fermi GBM Final Real-time Localization
  44. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  45. Konus-Wind detection of GRB 220609B
  46. GRB 220623B: Fermi GBM Final Real-time Localization
  47. GRB 220623A: AGILE detection
  48. GRB 220623A: AstroSat CZTI detection
  49. GRB 220623A: Swift detection of a burst
  50. GRB 220618A: Fermi GBM detection
  51. Swift Detection of MAXI J0655-013
  52. Konus-Wind detection of GRB 220617A
  53. GRB 220620B: Fermi GBM Final Real-time Localization
  54. GRB 220619A: AstroSat CZTI detection
  55. GRB 220620A: Fermi GBM Final Real-time Localization
  56. GRB 220617A: TNG optical observations
  57. Swift Trigger 1110865 is probably not an astrophysical event
  58. GRB 220611A optical counterpart
  59. IPN triangulation of GRB 220617A (short)
  60. GRB 220618A: BOOTES-5/JGT early optical upper limit
  61. GRB 220618A: Swift detection of a burst
  62. GRB 220617A: Fermi-LAT detection
  63. GRB 220617A: Fermi GBM Final Real-time Localization
  64. GRB 220611A: Gemini Ks counterpart detection
  65. Konus-Wind detection of GRB 220613A
  66. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  67. GRB 220611A: Gemini South Infrared Detection
  68. IPN triangulation of GRB 220606C
  69. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  70. GRB 220612A: Swift/BAT-GUANO detection
  71. GRB 220608B: Detection by VZLUSAT-2
  72. GRB 220610B: AstroSat CZTI detection
  73. GRB 220611A: Swift detection of a burst
  74. IPN triangulation of GRB 220609B
  75. GRB 220610A: Fermi GBM Final Real-time Localization
  76. GRB 220609B: AstroSat CZTI detection
  77. GRB 220609B: CALET Gamma-Ray Burst Monitor detection
  78. GRB 220608A: AstroSat CZTI detection
  79. GRB 220609A: Fermi GBM Final Real-time Localization
  80. GRB 220606C: CALET Gamma-Ray Burst Monitor detection
  81. GRB 220608A: Fermi GBM Final Real-time Localization
  82. Konus-Wind detection of GRB 220601A
  83. GRB 220606A: Swift/BAT-GUANO detection
  84. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  85. GRB 220606B: Fermi GBM Final Real-time Localization
  86. GRB 220606A: Fermi GBM Final Real-time Localization
  87. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  88. GRB 220527A: MITSuME Akeno continued optical observation
  89. GRB 220527A: Lick 3m Optical Observations
  90. Konus-Wind detection of GRB 220528A
  91. IPN triangulation of GRB 220528A (short)
  92. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  93. Konus-Wind observation of GRB 220527A
  94. GRB 220530A: Fermi GBM Final Real-time Localization
  95. Correction to GCN 32148: Should be GRB 220528A
  96. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  97. GRB 220528A: Fermi GBM Final Localization
  98. GRB 220527A: AST3-3 Yaoan Optical Observation
  99. GRB 220527A: REM optical/NIR observations
  100. GRB 220527A: VLT/X-shooter spectroscopic redshift

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