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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"

28275 results found.

  1. GRB 220623A: T193-OHP optical upper limit
  2. GRB 220624A: Fermi GBM Detection
  3. IPN triangulation of GRB 220624A
  4. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  5. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  6. GRB 220624A: AGILE/GRID analysis
  7. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  8. GRB 220624A: AGILE detection
  9. Konus-Wind detection of GRB 220623A
  10. GRB 220624B: Fermi GBM Final Real-time Localization
  11. GRB 220624A: Fermi GBM Final Real-time Localization
  12. GRB 220623A: AbAO optical upper limit
  13. GRB 220623A: Swift-XRT refined Analysis
  14. GRB 220623A: NOT optical observations
  15. GRB 220623A: Swift/UVOT Upper Limits
  16. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  17. Konus-Wind detection of GRB 220609B
  18. GRB 220623B: Fermi GBM Final Real-time Localization
  19. GRB 220623A: Enhanced Swift-XRT position
  20. GRB 220623A: AGILE detection
  21. GRB 220623A: AstroSat CZTI detection
  22. GRB 220623A: iTelescope optical upper limit
  23. GRB 220623A: Swift-XRT observations
  24. GRB 220623A: Swift detection of a burst
  25. GRB 220618A: Fermi GBM detection
  26. Swift Detection of MAXI J0655-013
  27. GRB 220618A: iTelescope T-19 upper limit
  28. Konus-Wind detection of GRB 220617A
  29. GRB 220620B: Fermi GBM Final Real-time Localization
  30. GRB 220619A: AstroSat CZTI detection
  31. GRB 220620A: Fermi GBM Final Real-time Localization
  32. GRB 220611A: Continued Gemini Infrared Observations
  33. GRB 220617A: TNG optical observations
  34. Swift Trigger 1110865 is probably not an astrophysical event
  35. GRB 220611A optical counterpart
  36. GRB 220618A: Swift-XRT refined Analysis
  37. IPN triangulation of GRB 220617A (short)
  38. GRB 220618A: BOOTES-5/JGT early optical upper limit
  39. GRB 220618A: Swift/UVOT Upper Limits
  40. GRB220611A: Gemini Optical Afterglow Confirmation
  41. GRB 220618A: Enhanced Swift-XRT position
  42. GRB 220617A: Swift-XRT observations
  43. GRB 220618A: Swift detection of a burst
  44. GRB 220617A: Fermi-LAT detection
  45. GRB 220617B: Swift ToO observations
  46. GRB 220617A: Fermi GBM Final Real-time Localization
  47. GRB 220611A: Gemini Ks counterpart detection
  48. Konus-Wind detection of GRB 220613A
  49. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  50. GRB 220611A: Gemini South Infrared Detection
  51. IPN triangulation of GRB 220606C
  52. GRB 220611A: Swift/UVOT Upper Limits
  53. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  54. GRB 220612A: Swift/BAT-GUANO detection
  55. GRB 220608B: Detection by VZLUSAT-2
  56. GRB 220611A: Swift-XRT refined Analysis
  57. GRB 220610B: AstroSat CZTI detection
  58. GRB 220611A: Enhanced Swift-XRT position
  59. GRB 220611A: Swift detection of a burst
  60. IPN triangulation of GRB 220609B
  61. GRB 220610A: Fermi GBM Final Real-time Localization
  62. GRB 220609B: AstroSat CZTI detection
  63. GRB 220609B: CALET Gamma-Ray Burst Monitor detection
  64. GRB 220608A: AstroSat CZTI detection
  65. GRB 220609A: Fermi GBM Final Real-time Localization
  66. GRB 220606C: CALET Gamma-Ray Burst Monitor detection
  67. GRB 220608A: Fermi GBM Final Real-time Localization
  68. GRB 220606B: Swift follow-up observations
  69. Konus-Wind detection of GRB 220601A
  70. GRB 220606A: Swift/BAT-GUANO detection
  71. GRB 220606B: GUANO coordinate correction to GCN 32167
  72. GRB 220527A: A BdHN I with a clear UPE phase
  73. GRB 220606B: Swift ToO observations
  74. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  75. GRB 220606B: Fermi GBM Final Real-time Localization
  76. GRB 220606A: Fermi GBM Final Real-time Localization
  77. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  78. GRB 220527A: MITSuME Akeno continued optical observation
  79. GRB 220527A: Lick 3m Optical Observations
  80. Konus-Wind detection of GRB 220528A
  81. IPN triangulation of GRB 220528A (short)
  82. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  83. Konus-Wind observation of GRB 220527A
  84. GRB 220530A: Fermi GBM Final Real-time Localization
  85. Correction to GCN 32148: Should be GRB 220528A
  86. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  87. GRB 220528A: Fermi GBM Final Localization
  88. GRB 220527A: AST3-3 Yaoan Optical Observation
  89. GRB 220527A: REM optical/NIR observations
  90. GRB 220527A: VLT/X-shooter spectroscopic redshift
  91. GRB 220527A: MeerLICHT afterglow observations
  92. GRB 220527A: NOT optical photometry and spectroscopic redshift
  93. GRB 220527A: AstroSat CZTI detection
  94. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  95. GRB 220527A: MITSuME Akeno optical observation
  96. GRB 220527A: Swift/UVOT detection
  97. GRB 220527A: Swift-XRT afterglow detection
  98. GRB 220527A: Swift ToO observations
  99. GRB 220527A: Fermi-LAT detection
  100. GRB 220527A: Fermi GBM Final Localization

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