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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"

27834 results found.

  1. IPN triangulation of GRB 220624A
  2. GRB 220623A: Swift-BAT refined analysis
  3. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  4. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  5. GRB 220624A: AGILE/GRID analysis
  6. IceCube-220624A - IceCube observation of a high-energy neutrino candidate track-like event
  7. GRB 220624A: AGILE detection
  8. Konus-Wind detection of GRB 220623A
  9. GRB 220624B: Fermi GBM Final Real-time Localization
  10. GRB 220624A: Fermi GBM Final Real-time Localization
  11. GRB 220623A: AbAO optical upper limit
  12. GRB 220623A: Swift-XRT refined Analysis
  13. GRB 220623A: Swift/UVOT Upper Limits
  14. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  15. Konus-Wind detection of GRB 220609B
  16. GRB 220623B: Fermi GBM Final Real-time Localization
  17. GRB 220623A: Enhanced Swift-XRT position
  18. GRB 220623A: AGILE detection
  19. GRB 220623A: AstroSat CZTI detection
  20. GRB 220623A: Swift-XRT observations
  21. GRB 220623A: Swift detection of a burst
  22. GRB 220618A: Fermi GBM detection
  23. Swift Detection of MAXI J0655-013
  24. GRB 220618A: Swift-BAT refined analysis
  25. GRB 220618A: iTelescope T-19 upper limit
  26. Konus-Wind detection of GRB 220617A
  27. GRB 220620B: Fermi GBM Final Real-time Localization
  28. GRB 220619A: AstroSat CZTI detection
  29. Swift GRB220620.02: Global MASTER-Net observations report
  30. GRB 220620A: Fermi GBM Final Real-time Localization
  31. GRB 220611A: Continued Gemini Infrared Observations
  32. GRB 220617A: TNG optical observations
  33. Swift Trigger 1110865 is probably not an astrophysical event
  34. GRB 220611A optical counterpart
  35. GRB 220618A: Swift-XRT refined Analysis
  36. IPN triangulation of GRB 220617A (short)
  37. GRB 220618A: BOOTES-5/JGT early optical upper limit
  38. GRB 220618A: Swift/UVOT Upper Limits
  39. GRB 220618A: Enhanced Swift-XRT position
  40. GRB 220617A: Swift-XRT observations
  41. GRB 220618A: Swift detection of a burst
  42. Swift GRB220618.38: Global MASTER-Net observations report
  43. GRB 220617A: Fermi-LAT detection
  44. GRB 220617B: Swift ToO observations
  45. GRB 220617A: Fermi GBM Final Real-time Localization
  46. GRB 220611A: Gemini Ks counterpart detection
  47. Konus-Wind detection of GRB 220613A
  48. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  49. GRB 220611A: Gemini South Infrared Detection
  50. IPN triangulation of GRB 220606C
  51. GRB 220611A: Swift/UVOT Upper Limits
  52. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  53. GRB 220612A: Swift/BAT-GUANO detection
  54. GRB 220611A: Swift-BAT refined analysis
  55. GRB 220608B: Detection by VZLUSAT-2
  56. Swift GRB 220611A: Global MASTER-Net observations report
  57. GRB 220611A: Swift-XRT refined Analysis
  58. GRB 220610B: AstroSat CZTI detection
  59. GRB 220611A: Enhanced Swift-XRT position
  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 220606A: Fermi GBM observation
  68. GRB 220606C: CALET Gamma-Ray Burst Monitor detection
  69. GRB 220608A: Fermi GBM Final Real-time Localization
  70. GRB 220606B: Gemini South Optical Observations
  71. GRB 220606B: Fermi GBM Observation
  72. GRB 220606B: Swift follow-up observations
  73. Konus-Wind detection of GRB 220601A
  74. GRB 220606A: Swift/BAT-GUANO detection
  75. GRB 220606B: GUANO coordinate correction to GCN 32167
  76. GRB 220527A: A BdHN I with a clear UPE phase
  77. GRB 220606B: Swift ToO observations
  78. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  79. GRB 220606B: Fermi GBM Final Real-time Localization
  80. GRB 220606A: Fermi GBM Final Real-time Localization
  81. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  82. GRB 220527A: MITSuME Akeno continued optical observation
  83. GRB 220527A: Lick 3m Optical Observations
  84. Konus-Wind detection of GRB 220528A
  85. IPN triangulation of GRB 220528A (short)
  86. GRB 220528A: Fermi GBM Observation
  87. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  88. Konus-Wind observation of GRB 220527A
  89. Swift trigger 1108515 is not an astrophysical event
  90. GRB 220530A: Fermi GBM Final Real-time Localization
  91. Correction to GCN 32148: Should be GRB 220528A
  92. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  93. GRB 220528A: Fermi GBM Final Localization
  94. GRB 220527A: AST3-3 Yaoan Optical Observation
  95. GRB 220527A: REM optical/NIR observations
  96. GRB 220527A: VLT/X-shooter spectroscopic redshift
  97. GRB 220527A: MeerLICHT afterglow observations
  98. GRB 220527A: AstroSat CZTI detection
  99. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  100. GRB 220527A: MITSuME Akeno optical observation

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