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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').

3087 results found.

  1. IceCube-220907A: No significant detection in HAWC
  2. Fermi trigger No 684716840: Global MASTER-Net observations report
  3. Fermi GRB 220912A: Global MASTER-Net observations report
  4. IceCube Alert 220907.28: Global MASTER-Net observations report
  5. Fermi GRB 220905A: Global MASTER-Net observations report
  6. Fermi GRB 220902A: Global MASTER-Net observations report
  7. Fermi trigger No 683537972: Global MASTER-Net observations report
  8. Fermi trigger No 683202084: Global MASTER-Net observations report
  9. Fermi trigger No 683183601: Global MASTER-Net observations report
  10. GRB 220825A: Fermi GBM observation
  11. GRB 220825A: Swift/BAT-GUANO detection
  12. GRB 220825A: Fermi GBM Final Localization
  13. Fermi trigger No 682918137: Global MASTER-Net observations report
  14. Fermi trigger No 681719116: Global MASTER-Net observations report
  15. Fermi trigger No 681271717: Global MASTER-Net observations report
  16. Fermi trigger No 680782656: Global MASTER-Net observations report
  17. Fermi GRB 220728A: Global MASTER-Net observations report
  18. GRB 220715B: BOOTES-network optical upper limits
  19. Fermi trigger No 679248723: Global MASTER-Net observations report
  20. Fermi GRB 220711B: Global MASTER-Net observations report
  21. GRB 220706A: MAXI/GSC detection 84 minutes after the Swift Trigger
  22. MAXI GRB220706.73: Global MASTER-Net observations report
  23. GRB 200701A: KAIT Optical Upper Limit
  24. Trigger 1113743: Swift detection of MAXI J0655-013
  25. Fermi trigger No 678058621: Global MASTER-Net observations report
  26. IceCube Alert 220627.74: Global MASTER-Net observations report
  27. Fermi GRB 220623B: Global MASTER-Net observations report
  28. GRB 220624A: AGILE detection
  29. Swift Detection of MAXI J0655-013
  30. GRB 220618A: Swift-BAT refined analysis
  31. Fermi trigger No 677377371: Global MASTER-Net observations report
  32. Fermi trigger No 677307509: Global MASTER-Net observations report
  33. Fermi trigger No 677174940: Global MASTER-Net observations report
  34. IPN triangulation of GRB 220613A
  35. Fermi trigger No 676909037: Global MASTER-Net observations report
  36. Fermi GRB 220610A: Global MASTER-Net observations report
  37. MAXI GRB220607.31: Global MASTER-Net observations report
  38. MAXI GRB220607.41: Global MASTER-Net observations report
  39. Konus-Wind detection of GRB 220601A
  40. Fermi trigger No 675992935: Global MASTER-Net observations report
  41. Fermi trigger No 675411172: Global MASTER-Net observations report
  42. GRB 220521A: ISON-Castelgrande observatory optical observations
  43. Swift GRB220521.97: Global MASTER-Net observations report
  44. Konus-Wind detection of GRB 220506A
  45. Konus-Wind detection of GRB 220514B
  46. GRB 220514B: Swift-XRT observations
  47. GRB 220514B: Tiled Swift observations
  48. [SUBJECT]: IceCube-220513A: No significant detection in HAWC
  49. GRB 220514B: MAXI/GSC detection
  50. MAXI GRB220514.98: Global MASTER-Net observations report
  51. Integral GRB220514.52: Global MASTER-Net observations report
  52. Fermi GRB 220514A: Global MASTER-Net observations report
  53. Fermi GRB 220513A: Global MASTER-Net observations report
  54. Konus-Wind detection of GRB 220511A
  55. GRB 220511A: Swift/BAT-GUANO arcminute localization
  56. GRB 220511A: AGILE detection
  57. Fermi trigger No 673846271: Global MASTER-Net observations report
  58. GRB 220506A: MITSuME Akeno optical upper limits
  59. GRB 220506A: GIT optical upper limit.
  60. GRB 220506A: BOOTES-5/JGT optical upper limit
  61. GRB 220506A: Swift-XRT afterglow detection
  62. GRB 220506A: Tiled Swift observations
  63. Swift GRB220506.51: Global MASTER-Net observations report
  64. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  65. MAXI GRB220506.27: Global MASTER-Net observations report
  66. GRB 220427A: LCO Optical Observations
  67. GRB 220501A: Swift-BAT refined analysis
  68. GRB 220426A: Swift-XRT and UVOT observations
  69. Fermi GRB 220426A: Global MASTER-Net observations report
  70. Fermi GRB 220426B: Global MASTER-Net observations report
  71. Fermi trigger No 672492774: Global MASTER-Net observations report
  72. IceCube Alert 220424.05: Global MASTER-Net observations report
  73. GRB 220421A: Fermi GBM observation
  74. Fermi trigger No 672093919: Global MASTER-Net observations report
  75. IPN triangulation of GRB 220411A
  76. GRB 220408A: Swift-BAT refined analysis
  77. GRB 220408A: 1.3m DFOT Optical upper limit
  78. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  79. GRB 220408A: LCO Optical Afterglow Detection
  80. Fermi GRB 220408B: Global MASTER-Net observations report
  81. GRB 220408A: Fermi GBM observation
  82. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  83. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  84. Fermi GRB 220401B: Global MASTER-Net observations report
  85. Fermi GRB 220330A: Global MASTER-Net observations report
  86. GRB 220325A: Swift-BAT refined analysis
  87. GRB 220319A: MASTER Global Robotic Net optical observations
  88. GRB 220310A: MITSuME Akeno optical observation
  89. IPN triangulation of GRB 220310A
  90. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  91. Konus-Wind detection of GRB 220310A
  92. GRB 220310A: GIT confirmation of optical afterglow.
  93. GRB 220310A: MASTER optical counterpart detection
  94. GRB 220310A: Swift ToO observations
  95. GRB 220310A: CALET Gamma-Ray Burst Monitor detection
  96. GRB 220310A: MAXI/GSC detection
  97. MAXI GRB220310.02: Global MASTER-Net observations report
  98. Konus-Wind detection of GRB 220308A
  99. Fermi GRB 220309A: Global MASTER-Net observations report
  100. IPN triangulation of GRB 220308A (long / very bright)

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