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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"

39439 results found.

  1. GRB 220706A: Swift/UVOT Upper Limits
  2. GRB 220708B: Swift-XRT afterglow detection
  3. GRB 220708A: BOOTES-5/JGT early optical upper limit
  4. GRB 220706A: Swift-BAT refined analysis
  5. GRB 220708A: Enhanced Swift-XRT position
  6. GRB 220708B: Swift ToO observations
  7. GRB 220708B: Swift/BAT-GUANO arcminute localization
  8. GRB 220708A: Swift-XRT observations
  9. GRB 220708A: Swift detection of a burst
  10. GRB 220706A: LCO Optical Upper Limits
  11. GRB 220627A: ATCA detection of radio counterpart
  12. GRB 220706A: Swift-XRT refined Analysis
  13. GRB 220706A, GROND observations
  14. GRB 220706A: Optical observations from NOT
  15. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  16. GRB 220702B: AstroSat CZTI detection
  17. GRB 220706A: Nanshan/NEXT optical upper limits
  18. MAXI GRB220706.73: Global MASTER-Net observations report
  19. GRB 220706A: Enhanced Swift-XRT position
  20. Swift GRB 220706A: Global MASTER-Net observations report
  21. GRB 220706A: Zadko observatory - Gingin optical observations
  22. GRB 220706A: Prompt enhanced Swift-XRT position
  23. GRB 220706A: Swift detection of a burst
  24. GRB 220701A: Swift-BAT refined analysis
  25. GRB 220702B: Fermi GBM Final Localization
  26. GRB 220702A: Fermi GBM Final Localization
  27. GRB 220705A: Fermi GBM Final Localization
  28. Fermi trigger No 678635286: Global MASTER-Net observations report
  29. GRB 220701A: MITSuME Akeno optical upper limits
  30. GRB 220701A: COATLI Optical Upper Limit
  31. GRB 220701A: AbAO optical upper limit
  32. GRB 220627A: AstroSat CZTI detection
  33. GRB 220701A: Keck/LRIS Optical Upper Limit
  34. GRB 220701A: Swift-XRT refined Analysis
  35. GRB 220701A: LCO Optical Upper Limits
  36. GRB 220701A: BOOTES-5/JGT early optical upper limit
  37. GRB 220701A: Swift/UVOT Upper Limits
  38. GRB 220701A: Lowell Discovery Telescope Optical Observations
  39. GRB 220701A: Enhanced Swift-XRT position
  40. GRB 200701A: KAIT Optical Upper Limit
  41. GRB 220701A: Swift detection of a burst
  42. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  43. GRB 220627A, GROND observations
  44. GRB 220624A: AGILE/GRID refined analysis
  45. GRB 220627A: Swift/UVOT Upper Limits
  46. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  47. IceCube Alert 220629.99: Global MASTER-Net observations report
  48. GRB 220627A: Swift-XRT afterglow detection
  49. Konus-Wind detection of GRB 220627A
  50. Trigger 1113743: Swift detection of MAXI J0655-013
  51. GRB 220627A: VLT MUSE redshift
  52. GRB 220627A: MeerLICHT candidate optical afterglow
  53. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  54. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  55. Konus-Wind detection of GRB 220624A
  56. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  57. GRB 220627A: Swift ToO observations
  58. GRB 220627A: Fermi-LAT detection
  59. Fermi trigger No 678058621: Global MASTER-Net observations report
  60. GRB 220627A: MeerLICHT detection of two afterglow candidates
  61. Fermi GRB 220627A: Global MASTER-Net observations report
  62. GRB 220627A: Fermi GBM Final Real-time Localization
  63. IceCube Alert 220627.74: Global MASTER-Net observations report
  64. GRB 220623A: GIT optical upper limits.
  65. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  66. GRB 220623A: T193-OHP optical upper limit
  67. GRB 220624A: Fermi GBM Detection
  68. Fermi GRB 220623B: Global MASTER-Net observations report
  69. Fermi GRB 220624A: Global MASTER-Net observations report
  70. IceCube Alert 220624.68: Global MASTER-Net observations report
  71. IPN triangulation of GRB 220624A
  72. GRB 220623A: Swift-BAT refined analysis
  73. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  74. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  75. GRB 220624A: AGILE/GRID analysis
  76. GRB 220624A: AGILE detection
  77. Konus-Wind detection of GRB 220623A
  78. GRB 220624B: Fermi GBM Final Real-time Localization
  79. GRB 220624A: Fermi GBM Final Real-time Localization
  80. GRB 220623A: AbAO optical upper limit
  81. GRB 220623A: Swift-XRT refined Analysis
  82. GRB 220623A: NOT optical observations
  83. GRB 220623A: Swift/UVOT Upper Limits
  84. GRB 220623A: BOOTES-5/JGT optical afterglow detection
  85. Konus-Wind detection of GRB 220609B
  86. GRB 220623B: Fermi GBM Final Real-time Localization
  87. GRB 220623A: Enhanced Swift-XRT position
  88. GRB 220623A: AGILE detection
  89. GRB 220623A: AstroSat CZTI detection
  90. GRB 220623A: iTelescope optical upper limit
  91. GRB 220623A: Swift-XRT observations
  92. GRB 220623A: Swift detection of a burst
  93. Fermi trigger No 677597318: Global MASTER-Net observations report
  94. GRB 220618A: Fermi GBM detection
  95. Swift Detection of MAXI J0655-013
  96. GRB 220618A: Swift-BAT refined analysis
  97. GRB 220618A: iTelescope T-19 upper limit
  98. Konus-Wind detection of GRB 220617A
  99. Fermi trigger No 677377371: Global MASTER-Net observations report
  100. Fermi GRB 220620B: Global MASTER-Net observations report

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