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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"

39429 results found.

  1. GRB 220627A: ATCA detection of radio counterpart
  2. GRB 220706A: Swift-XRT refined Analysis
  3. GRB 220706A, GROND observations
  4. GRB 220706A: Optical observations from NOT
  5. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  6. GRB 220702B: AstroSat CZTI detection
  7. GRB 220706A: Nanshan/NEXT optical upper limits
  8. MAXI GRB220706.73: Global MASTER-Net observations report
  9. GRB 220706A: Enhanced Swift-XRT position
  10. Swift GRB 220706A: Global MASTER-Net observations report
  11. GRB 220706A: Zadko observatory - Gingin optical observations
  12. GRB 220706A: Prompt enhanced Swift-XRT position
  13. GRB 220706A: Swift detection of a burst
  14. GRB 220701A: Swift-BAT refined analysis
  15. GRB 220702B: Fermi GBM Final Localization
  16. GRB 220702A: Fermi GBM Final Localization
  17. GRB 220705A: Fermi GBM Final Localization
  18. Fermi trigger No 678635286: Global MASTER-Net observations report
  19. GRB 220701A: MITSuME Akeno optical upper limits
  20. GRB 220701A: COATLI Optical Upper Limit
  21. GRB 220701A: AbAO optical upper limit
  22. GRB 220627A: AstroSat CZTI detection
  23. GRB 220701A: Keck/LRIS Optical Upper Limit
  24. GRB 220701A: Swift-XRT refined Analysis
  25. GRB 220701A: LCO Optical Upper Limits
  26. GRB 220701A: BOOTES-5/JGT early optical upper limit
  27. GRB 220701A: Swift/UVOT Upper Limits
  28. GRB 220701A: Lowell Discovery Telescope Optical Observations
  29. GRB 220701A: Enhanced Swift-XRT position
  30. GRB 200701A: KAIT Optical Upper Limit
  31. GRB 220701A: Swift detection of a burst
  32. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  33. GRB 220627A, GROND observations
  34. GRB 220624A: AGILE/GRID refined analysis
  35. GRB 220627A: Swift/UVOT Upper Limits
  36. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  37. IceCube Alert 220629.99: Global MASTER-Net observations report
  38. GRB 220627A: Swift-XRT afterglow detection
  39. Konus-Wind detection of GRB 220627A
  40. Trigger 1113743: Swift detection of MAXI J0655-013
  41. GRB 220627A: VLT MUSE redshift
  42. GRB 220627A: MeerLICHT candidate optical afterglow
  43. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  44. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  45. Konus-Wind detection of GRB 220624A
  46. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  47. GRB 220627A: Swift ToO observations
  48. GRB 220627A: Fermi-LAT detection
  49. Fermi trigger No 678058621: Global MASTER-Net observations report
  50. GRB 220627A: MeerLICHT detection of two afterglow candidates
  51. Fermi GRB 220627A: Global MASTER-Net observations report
  52. GRB 220627A: Fermi GBM Final Real-time Localization
  53. IceCube Alert 220627.74: Global MASTER-Net observations report
  54. GRB 220623A: GIT optical upper limits.
  55. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  56. GRB 220623A: T193-OHP optical upper limit
  57. GRB 220624A: Fermi GBM Detection
  58. Fermi GRB 220623B: Global MASTER-Net observations report
  59. Fermi GRB 220624A: Global MASTER-Net observations report
  60. IceCube Alert 220624.68: Global MASTER-Net observations report
  61. IPN triangulation of GRB 220624A
  62. GRB 220623A: Swift-BAT refined analysis
  63. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  64. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  65. GRB 220624A: AGILE/GRID analysis
  66. GRB 220624A: AGILE detection
  67. Konus-Wind detection of GRB 220623A
  68. GRB 220624B: Fermi GBM Final Real-time Localization
  69. GRB 220624A: Fermi GBM Final Real-time Localization
  70. GRB 220623A: AbAO optical upper limit
  71. GRB 220623A: Swift-XRT refined Analysis
  72. GRB 220623A: NOT optical observations
  73. GRB 220623A: Swift/UVOT Upper Limits
  74. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  75. Konus-Wind detection of GRB 220609B
  76. GRB 220623B: Fermi GBM Final Real-time Localization
  77. GRB 220623A: Enhanced Swift-XRT position
  78. GRB 220623A: AGILE detection
  79. GRB 220623A: AstroSat CZTI detection
  80. GRB 220623A: iTelescope optical upper limit
  81. GRB 220623A: Swift-XRT observations
  82. GRB 220623A: Swift detection of a burst
  83. Fermi trigger No 677597318: Global MASTER-Net observations report
  84. GRB 220618A: Fermi GBM detection
  85. Swift Detection of MAXI J0655-013
  86. GRB 220618A: Swift-BAT refined analysis
  87. GRB 220618A: iTelescope T-19 upper limit
  88. Konus-Wind detection of GRB 220617A
  89. Fermi trigger No 677377371: Global MASTER-Net observations report
  90. Fermi GRB 220620B: Global MASTER-Net observations report
  91. Fermi GRB 220620A: Global MASTER-Net observations report
  92. GRB 220620B: Fermi GBM Final Real-time Localization
  93. Integral GRB220619.53: Global MASTER-Net observations report
  94. GRB 220619A: AstroSat CZTI detection
  95. Swift GRB220620.02: Global MASTER-Net observations report
  96. GRB 220620A: Fermi GBM Final Real-time Localization
  97. GRB 220611A: Continued Gemini Infrared Observations
  98. GRB 220617A: TNG optical observations
  99. Fermi trigger No 677307509: Global MASTER-Net observations report
  100. Fermi trigger No 677236224: Global MASTER-Net observations report

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