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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

3797 results found.

  1. GRB 221008A: Tiled Swift observations
  2. GRB 221008A: MAXI/GSC detection
  3. GRB 221006A: Swift-XRT observations
  4. GRB 221006A: Tiled Swift observations
  5. GRB 221006A: MAXI/GSC detection
  6. Fermi trigger No 686588176: Global MASTER-Net observations report
  7. GRB 220927A: Fermi GBM Final Localization
  8. Fermi GRB 220925A: Global MASTER-Net observations report
  9. Fermi trigger No 685748699: Global MASTER-Net observations report
  10. Fermi trigger No 685452089: Global MASTER-Net observations report
  11. IceCube-220907A: No significant detection in HAWC
  12. Fermi trigger No 684716840: Global MASTER-Net observations report
  13. Fermi GRB 220912A: Global MASTER-Net observations report
  14. IceCube Alert 220907.28: Global MASTER-Net observations report
  15. Fermi GRB 220905A: Global MASTER-Net observations report
  16. Fermi GRB 220902A: Global MASTER-Net observations report
  17. Fermi trigger No 683537972: Global MASTER-Net observations report
  18. Fermi trigger No 683202084: Global MASTER-Net observations report
  19. Fermi trigger No 683183601: Global MASTER-Net observations report
  20. GRB 220825A: Fermi GBM observation
  21. GRB 220825A: Swift/BAT-GUANO detection
  22. GRB 220825A: Fermi GBM Final Localization
  23. Fermi trigger No 682918137: Global MASTER-Net observations report
  24. Fermi trigger No 681719116: Global MASTER-Net observations report
  25. Fermi trigger No 681271717: Global MASTER-Net observations report
  26. Fermi trigger No 680782656: Global MASTER-Net observations report
  27. Fermi GRB 220728A: Global MASTER-Net observations report
  28. GRB 220715B: BOOTES-network optical upper limits
  29. Fermi trigger No 679248723: Global MASTER-Net observations report
  30. Fermi GRB 220711B: Global MASTER-Net observations report
  31. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  32. MAXI GRB220706.73: Global MASTER-Net observations report
  33. GRB 200701A: KAIT Optical Upper Limit
  34. Trigger 1113743: Swift detection of MAXI J0655-013
  35. Fermi trigger No 678058621: Global MASTER-Net observations report
  36. IceCube Alert 220627.74: Global MASTER-Net observations report
  37. Fermi GRB 220623B: Global MASTER-Net observations report
  38. GRB 220624A: AGILE detection
  39. Swift Detection of MAXI J0655-013
  40. GRB 220618A: Swift-BAT refined analysis
  41. Fermi trigger No 677377371: Global MASTER-Net observations report
  42. Fermi trigger No 677307509: Global MASTER-Net observations report
  43. Fermi trigger No 677174940: Global MASTER-Net observations report
  44. IPN triangulation of GRB 220613A
  45. Fermi trigger No 676909037: Global MASTER-Net observations report
  46. Fermi GRB 220610A: Global MASTER-Net observations report
  47. MAXI GRB220607.31: Global MASTER-Net observations report
  48. MAXI GRB220607.41: Global MASTER-Net observations report
  49. Konus-Wind detection of GRB 220601A
  50. Fermi trigger No 675992935: Global MASTER-Net observations report
  51. Fermi trigger No 675411172: Global MASTER-Net observations report
  52. GRB 220521A: ISON-Castelgrande observatory optical observations
  53. Swift GRB220521.97: Global MASTER-Net observations report
  54. Konus-Wind detection of GRB 220506A
  55. Konus-Wind detection of GRB 220514B
  56. GRB 220514B: Swift-XRT observations
  57. GRB 220514B: Tiled Swift observations
  58. IceCube-220513A: No significant detection in HAWC
  59. GRB 220514B: MAXI/GSC detection
  60. MAXI GRB220514.98: Global MASTER-Net observations report
  61. Integral GRB220514.52: Global MASTER-Net observations report
  62. Fermi GRB 220514A: Global MASTER-Net observations report
  63. Fermi GRB 220513A: Global MASTER-Net observations report
  64. Konus-Wind detection of GRB 220511A
  65. GRB 220511A: Swift/BAT-GUANO arcminute localization
  66. GRB 220511A: AGILE detection
  67. Fermi trigger No 673846271: Global MASTER-Net observations report
  68. GRB 220506A: MITSuME Akeno optical upper limits
  69. GRB 220506A: GIT optical upper limit.
  70. GRB 220506A: BOOTES-5/JGT optical upper limit
  71. GRB 220506A: Swift-XRT afterglow detection
  72. GRB 220506A: Tiled Swift observations
  73. Swift GRB220506.51: Global MASTER-Net observations report
  74. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  75. MAXI GRB220506.27: Global MASTER-Net observations report
  76. GRB 220427A: LCO Optical Observations
  77. GRB 220501A: Swift-BAT refined analysis
  78. GRB 220426A: Swift-XRT and UVOT observations
  79. Fermi GRB 220426A: Global MASTER-Net observations report
  80. Fermi GRB 220426B: Global MASTER-Net observations report
  81. Fermi trigger No 672492774: Global MASTER-Net observations report
  82. IceCube Alert 220424.05: Global MASTER-Net observations report
  83. GRB 220421A: Fermi GBM observation
  84. Fermi trigger No 672093919: Global MASTER-Net observations report
  85. IPN triangulation of GRB 220411A
  86. GRB 220408A: Swift-BAT refined analysis
  87. GRB 220408A: 1.3m DFOT Optical upper limit
  88. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  89. GRB 220408A: LCO Optical Afterglow Detection
  90. Fermi GRB 220408B: Global MASTER-Net observations report
  91. GRB 220408A: Fermi GBM observation
  92. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  93. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  94. Fermi GRB 220401B: Global MASTER-Net observations report
  95. Fermi GRB 220330A: Global MASTER-Net observations report
  96. GRB 220325A: Swift-BAT refined analysis
  97. GRB 220319A: MASTER Global Robotic Net optical observations
  98. GRB 220310A: MITSuME Akeno optical observation
  99. IPN triangulation of GRB 220310A
  100. GRB 220310A: [KAO-Egypt] SDSS r, i observation

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