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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"

22198 results found.

  1. GRB 220921A: ATCA detection of radio counterpart
  2. Fermi trigger No 686403226: Global MASTER-Net observations report
  3. Fermi trigger No 686350260: Global MASTER-Net observations report
  4. Konus-Wind detection of GRB 220930A
  5. GRB 220930A: Swift/UVOT Upper Limits
  6. Swift GRB 220930A: Global MASTER-Net observations report
  7. Fermi-LAT gamma-ray observations of IceCube-220928A
  8. Konus-Wind detection of GRB 220927A
  9. Fermi GRB 220927A: Global MASTER-Net observations report
  10. GRB 220921A: LCOGT Optical Observations
  11. GRB 220611A: Host galaxy redshift from VLT/X-shooter
  12. Integral GRB220926.44: Global MASTER-Net observations report
  13. Swift GRB220926.34: Global MASTER-Net observations report
  14. Swift GRB 220926A: Global MASTER-Net observations report
  15. Fermi GRB 220925A: Global MASTER-Net observations report
  16. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  17. GRB 220921A: further MeerLICHT observations
  18. Fermi trigger No 685748699: Global MASTER-Net observations report
  19. Swift GRB220923.47: Global MASTER-Net observations report
  20. GRB 220921A: ALMA detection
  21. GRB 220921A: DDOTI Detection of the Afterglow
  22. Konus-Wind detection of GRB 220921A
  23. IceCube-220907A: Classification of AT2022oyn as a Type Ia supernova
  24. GRB 220921A: MeerLICHT afterglow observations
  25. GRB 220921A: Swift-XRT Observations
  26. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  27. LAT GRB220921.46: Global MASTER-Net observations report
  28. GRB 220921A: Tiled Swift observations
  29. Fermi trigger No 685452089: Global MASTER-Net observations report
  30. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  31. IceCube Alert 220918.53: Global MASTER-Net observations report
  32. Fermi trigger No 684894705: Global MASTER-Net observations report
  33. Fermi trigger No 684927323: Global MASTER-Net observations report
  34. Fermi trigger No 684911625: Global MASTER-Net observations report
  35. Konus-Wind detection of GRB 220910A
  36. Fermi trigger No 684716840: Global MASTER-Net observations report
  37. Fermi GRB 220912A: Global MASTER-Net observations report
  38. GRB 220831A: DECam optical counterpart follow-up
  39. GRB 220909A: Swift-XRT observations
  40. GRB 220909A: Swift ToO observations
  41. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  42. GRB 220831A: Gemini-South Infrared Observations
  43. IceCube-220907A: One Candidate Counterpart from the Zwicky Transient Facility
  44. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  45. GRB 220907A: Swift/UVOT Upper Limits
  46. GRB 220831A: ATCA 5/9 GHz radio observations
  47. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  48. Swift GRB220907.59: Global MASTER-Net observations report
  49. IceCube Alert 220907.28: Global MASTER-Net observations report
  50. GRB 220831A: Swift-UVOT Upper Limits
  51. Fermi GRB 220905A: Global MASTER-Net observations report
  52. GRB 220831A: DECam detection of a possible optical counterpart
  53. Fermi GRB 220902A: Global MASTER-Net observations report
  54. GRB 220831A, VLT/HAWK-I near-infrared observations
  55. GRB 220831A: Swift-XRT observations
  56. GRB 220831A: Swift ToO observations
  57. Fermi trigger No 683654200: Global MASTER-Net observations report
  58. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  59. Fermi trigger No 683646997: Global MASTER-Net observations report
  60. Fermi trigger No 683537972: Global MASTER-Net observations report
  61. Fermi trigger No 683476673: Global MASTER-Net observations report
  62. IceCube-220822A: Classification of AT2022saw as a Type Ia supernova
  63. Fermi trigger No 683202084: Global MASTER-Net observations report
  64. Fermi trigger No 683183601: Global MASTER-Net observations report
  65. Fermi trigger No 683152759: Global MASTER-Net observations report
  66. GRB 220826A: Swift/UVOT Detection
  67. GRB 220826A: iTelescope optical afterglow observations
  68. Swift GRB 220826A: Global MASTER-Net observations report
  69. GRB 220825A: Swift/BAT-GUANO detection
  70. IceCube-220822A: One Candidate Counterpart from the Zwicky Transient Facility
  71. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  72. Fermi trigger No 682918137: Global MASTER-Net observations report
  73. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  74. IceCube Alert 220822.85: Global MASTER-Net observations report
  75. GRB 220813A: VLT optical observations and possible host galaxy
  76. GRB 220813A: Swift/UVOT Detection
  77. GRB 220810A: Further Swift-XRT observations
  78. Swift GRB 220813A: Global MASTER-Net observations report
  79. GRB 220810A: Swift-XRT observations
  80. Fermi trigger No 681998863: Global MASTER-Net observations report
  81. GRB 220810A: Swift ToO observations
  82. GRB 220810A: MeerLICHT detection of two afterglow candidates
  83. Fermi trigger No 681890304: Global MASTER-Net observations report
  84. Fermi GRB 220810A: Global MASTER-Net observations report
  85. GRB 220627A: MeerKAT radio observations
  86. Fermi trigger No 681719116: Global MASTER-Net observations report
  87. Fermi trigger No 681633544: Global MASTER-Net observations report
  88. IceCube Alert 220808.33: Global MASTER-Net observations report
  89. Swift GRB220806.76: Global MASTER-Net observations report
  90. Fermi trigger No 681271717: Global MASTER-Net observations report
  91. Fermi trigger No 681212354: Global MASTER-Net observations report
  92. GRB 220730A: Swift-XRT afterglow detection
  93. GRB 220730A: Swift/UVOT Upper Limits
  94. GRB 220730A: Swift-XRT observations
  95. Swift GRB 220730A: Global MASTER-Net observations report
  96. Fermi trigger No 680782656: Global MASTER-Net observations report
  97. Fermi GRB 220728A: Global MASTER-Net observations report
  98. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220728A
  99. Fermi trigger No 680421061: Global MASTER-Net observations report
  100. Fermi GRB 220724A: Global MASTER-Net observations report

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