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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"

12185 results found.

  1. ZTF20acozryr/AT2020yxz (GRB 201103B): SAO RAS optical observations
  2. IceCube 201114A: Swift followup of Fermi J0703.5+0505
  3. Konus-Wind detection of GRB 201116A
  4. Fermi-LAT Gamma-ray Observations of IceCube-201114A
  5. GRB 201116A: Swift-XRT afterglow detection
  6. Fermi trigger No 627198169: Global MASTER-Net observations report
  7. GRB 201116A: Fermi-LAT detection
  8. Fermi-LAT Gamma-ray Observations of IceCube-201115A
  9. Swift XRT observations of the Fermi-LAT source 4FGL J0658.6+0636, positionally consistent with the IceCube high-energy neutrino alert
  10. IceCube GCN alert 134701_49508272.amon retraction
  11. IceCube-201115A: IceCube observation of a high-energy neutrino candidate event
  12. IceCube-201114A - IceCube observation of a high-energy neutrino candidate event
  13. Fermi-LAT Gamma-ray Observations of NuEm-201107A
  14. Konus-Wind observation of GRB 201109A
  15. Swift Trigger 1005428: Detection of SGR 1830-0645
  16. ZTF20acozryr (GRB 201103B): GROWTH-India Telescope optical observations
  17. Konus-Wind observation of GRB 201103B
  18. Konus-Wind detection of GRB 201105A
  19. ZTF20acozryr/AT2020yxz (GRB 201103B): Assy optical observations
  20. GRB 201104B: Swift-XRT refined Analysis
  21. ZTF20acozryr/AT2020yxz: Zwicky Transient Facility discovery of a fast optical transient with no associated GRB
  22. Swift Trigger 1004219: Detection of SGR 1830-0645
  23. GRB 201103B: AGILE detection
  24. GRB 201104A: AGILE/MCAL detection
  25. GRB 201104A: Fermi-LAT detection
  26. GRB 201104B: Swift/UVOT Detection
  27. Fermi GRB 201104A: Global MASTER-Net observations report
  28. Fermi GRB 201103A: Global MASTER-Net observations report
  29. Swift GRB 201031A: Global MASTER-Net observations report
  30. Fermi GRB 201031B: Global MASTER-Net observations report
  31. IceCube 201021A: Swift follow-up of Fermi J1725.5+1312
  32. Swift GRB 201029A: Global MASTER-Net observations report
  33. GRB 201029A: Fermi GBM detection
  34. GRB 201029A: Swift-XRT refined Analysis
  35. GRB 201029A: BOOTES-1 optical upper limit
  36. GRB 201029A: FRAM-ORM optical limit
  37. Fermi trigger No 625695596: Global MASTER-Net observations report
  38. GRB 201029A: Swift detection of a burst
  39. GRB 201027A: Swift-BAT refined analysis
  40. GRB 201027A: Swift-XRT refined Analysis
  41. Baksan Neutrino Observatory Alert 201027.41: Global MASTER-Net observations report
  42. GRB 201026A: FRAM-ORM optical detection limit
  43. GRB 201027A: Swift detection of a burst
  44. GRB201024A: rebrightening after initial steep decline
  45. GRB 201024A: Swift-XRT refined Analysis
  46. GRB 201024A: FRAM-ORM afterglow detection
  47. GRB 201024A: MASTER correction to GCN 28760
  48. GRB 201024A: Swift detection of a burst with an optical afterglow
  49. Swift GRB201024A: Global MASTER-Net OT detection
  50. Swift GRB201024.12: Global MASTER-Net observations report
  51. IceCube-201021A: No significant detection in HAWC
  52. GRB 201021C: Swift-BAT refined analysis
  53. GRB 201021C: Swift-XRT refined Analysis
  54. Baksan Neutrino Observatory Alert 201022.66: Global MASTER-Net observations report
  55. Fermi-LAT Gamma-ray Observations of IceCube-201021A and detection of a new gamma-ray source, Fermi J1725.5+1312
  56. GRB 201021C: Fermi GBM detection
  57. IceCube-201021A: Upper limits from a search for additional neutrino events in IceCube
  58. GRB 201021C: Swift/UVOT Detection
  59. Konus-Wind detection of GRB 201020A
  60. GRB 201020A: VIRT optical observations
  61. GRB 201021C: MASTER optical synchronously observation
  62. Swift GRB201021.85: Global MASTER-Net observations report
  63. GRB 201021C: Swift detection of a burst with an optical counterpart
  64. MAXI GRB201021.68: Global MASTER-Net observations report
  65. GRB 201021B MAXI/GSC detection
  66. GRB 201020B: Mondy optical observations
  67. Swift-XRT observations of IceCube 201021A
  68. Konus-Wind detection of GRB 201020B
  69. GRB 201015A: SAO RAS optical observations
  70. GRB 201020A: Redshift from GTC/OSIRIS
  71. GRB 201020B: Fermi-LAT detection
  72. IceCube-201021A: IceCube observation of a high-energy neutrino candidate event
  73. GRB 201020B: AGILE detection
  74. GRB 201020A: DOAO optical afterglow observations
  75. GRB 201020B: Fermi GBM detection
  76. GRB 201020A: CrAO/ZTSH optical observations
  77. GRB 201020A: Swift-XRT refined Analysis
  78. GRB 201020A: Fermi GBM observation
  79. Fermi GRB 201020B: Global MASTER-Net observations report
  80. GRB 201020A: Assy optical observations
  81. GRB 201020B: Fermi GBM Final Real-time Localization
  82. GRB 201020A: Nanshan/NEXT optical observations
  83. Swift GRB 201020A: Global MASTER-Net observations report
  84. GRB 201014A: SAO RAS optical observations
  85. GRB 201020A: MITSuME Akeno optical observation
  86. GRB 201020A: Swift detection of a burst with an optical counterpart.
  87. GRB 201017A iTelescope observation
  88. GRB 201017A: SAO RAS optical observations
  89. GRB 201017A: Swift-BAT refined analysis
  90. GRB 201017A: Assy and Mondy optical observations, possible afterglow detection
  91. GRB 201015A: Assy and Mondy optical observations
  92. GRB 201015A: FRAM-ORM afterglow detection
  93. Konus-Wind observation of GRB 201013A
  94. GRB 201014A: Swift-XRT refined Analysis
  95. Swift GRB 201015A: Global MASTER-Net observations report
  96. Fermi-LAT Gamma-ray Observations of IceCube-201014A
  97. GRB 201013A: FRAM-ORM possible afterglow candidate
  98. GRB 201013A: Swift-XRT refined Analysis
  99. SGR 1830-0645: Swift/UVOT Upper Limits
  100. GRB 201011A: Fermi GBM detection of a likely Long GRB in the direction of SGR 1830-0645

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