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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"

27831 results found.

  1. GRB 220715A: Fermi GBM Final Real-time Localization
  2. GRB 220714B: Swift-XRT refined Analysis
  3. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  4. GRB 220714B: UVOT afterglow discovery
  5. GRB 220714B: Enhanced Swift-XRT position
  6. GRB 220713A: Fermi GBM Final Localization
  7. GRB 220714B: Swift detection of a burst
  8. GRB 220714B: Fermi GBM Final Real-time Localization
  9. GRB 220714A: Possible Swift detection of a burst
  10. GRB 220710A: Swift/UVOT Upper Limits
  11. GRB 220711C: Fermi GBM Observation
  12. GRB 220710A: Swift-XRT afterglow detection
  13. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  14. Konus-Wind detection of GRB 220711C
  15. GRB 220711B: GIT optical upper limits
  16. GRB 220710A: Swift ToO observations
  17. GRB 220710A: Swift/BAT-GUANO arcminute localization
  18. GRB 220711B: Swift-BAT refined analysis
  19. IPN triangulation of GRB 220711C (short)
  20. GRB 220711B: Swift-XRT refined Analysis
  21. GRB 220711B: Swift/UVOT Upper Limits
  22. GRB 220711B: Enhanced Swift-XRT position
  23. GRB 220711B: Fermi GBM Detection
  24. GRB 220711B: LCO Optical Upper Limits
  25. GRB 220711B: Swift detection of a burst
  26. GRB 220711B: Fermi GBM Final Real-time Localization
  27. GRB 220707A: AstroSat CZTI detection
  28. GRB 220708B: GIT optical upper limits
  29. GRB 220711A: Fermi GBM Final Real-time Localization
  30. GRB 220708A: Swift-BAT refined analysis
  31. Konus-Wind detection of GRB 220708B (Correction to GCN 32358)
  32. Konus-Wind detection of GRB 220708B
  33. GRB 220708B: CALET Gamma-Ray Burst Monitor detection
  34. GRB 220708B: Nanshan/NEXT optical upper limits
  35. GRB 220708A: Swift/UVOT Upper Limits
  36. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  37. GRB 220708A: Swift-XRT refined Analysis
  38. GRB 220706A: Swift/UVOT Upper Limits
  39. GRB 220708B: Swift-XRT afterglow detection
  40. GRB 220708A: BOOTES-5/JGT early optical upper limit
  41. GRB 220706A: Swift-BAT refined analysis
  42. GRB 220708A: Enhanced Swift-XRT position
  43. GRB 220708B: Swift ToO observations
  44. GRB 220708B: Swift/BAT-GUANO arcminute localization
  45. GRB 220708A: Swift-XRT observations
  46. GRB 220708A: Swift detection of a burst
  47. GRB 220706A: LCO Optical Upper Limits
  48. GRB 220627A: ATCA detection of radio counterpart
  49. GRB 220706A: Swift-XRT refined Analysis
  50. GRB 220706A, GROND observations
  51. GRB 220706A: Optical observations from NOT
  52. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  53. GRB 220702B: AstroSat CZTI detection
  54. GRB 220706A: Nanshan/NEXT optical upper limits
  55. GRB 220706A: Enhanced Swift-XRT position
  56. Swift GRB 220706A: Global MASTER-Net observations report
  57. GRB 220706A: Zadko observatory - Gingin optical observations
  58. GRB 220706A: Prompt enhanced Swift-XRT position
  59. GRB 220706A: Swift detection of a burst
  60. GRB 220701A: Swift-BAT refined analysis
  61. GRB 220702B: Fermi GBM Final Localization
  62. GRB 220702A: Fermi GBM Final Localization
  63. GRB 220705A: Fermi GBM Final Localization
  64. GRB 220701A: MITSuME Akeno optical upper limits
  65. GRB 220701A: AbAO optical upper limit
  66. GRB 220627A: AstroSat CZTI detection
  67. GRB 220701A: Swift-XRT refined Analysis
  68. GRB 220701A: LCO Optical Upper Limits
  69. GRB 220701A: BOOTES-5/JGT early optical upper limit
  70. GRB 220701A: Swift/UVOT Upper Limits
  71. GRB 220701A: Enhanced Swift-XRT position
  72. GRB 200701A: KAIT Optical Upper Limit
  73. GRB 220701A: Swift detection of a burst
  74. GRB 220624A: AGILE/GRID refined analysis
  75. GRB 220627A: Swift/UVOT Upper Limits
  76. IceCube-220629A: No significant detection in HAWC
  77. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  78. IceCube-220627A: No significant detection in HAWC
  79. GRB 220627A: Swift-XRT afterglow detection
  80. Konus-Wind detection of GRB 220627A
  81. Trigger 1113743: Swift detection of MAXI J0655-013
  82. IceCube-220624A: One Candidate Counterpart from Swift/XRT follow up observations
  83. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  84. GRB 220627A: MeerLICHT candidate optical afterglow
  85. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  86. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  87. Konus-Wind detection of GRB 220624A
  88. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  89. GRB 220627A: Swift ToO observations
  90. GRB 220627A: Fermi-LAT detection
  91. GRB 220627A: MeerLICHT detection of two afterglow candidates
  92. GRB 220627A: Fermi GBM Final Real-time Localization
  93. IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event
  94. IceCube-220624A: No significant detection in HAWC
  95. GRB 220623A: GIT optical upper limits.
  96. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  97. GRB 220624A: Fermi GBM Detection
  98. IPN triangulation of GRB 220624A
  99. GRB 220623A: Swift-BAT refined analysis
  100. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV

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