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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"

22088 results found.

  1. GRB 220611A: Host galaxy redshift from VLT/X-shooter
  2. Integral GRB220926.44: Global MASTER-Net observations report
  3. Swift GRB220926.34: Global MASTER-Net observations report
  4. Swift GRB 220926A: Global MASTER-Net observations report
  5. Fermi GRB 220925A: Global MASTER-Net observations report
  6. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  7. GRB 220921A: further MeerLICHT observations
  8. Fermi trigger No 685748699: Global MASTER-Net observations report
  9. Swift GRB220923.47: Global MASTER-Net observations report
  10. GRB 220921A: ALMA detection
  11. GRB 220921A: DDOTI Detection of the Afterglow
  12. Konus-Wind detection of GRB 220921A
  13. IceCube-220907A: Classification of AT2022oyn as a Type Ia supernova
  14. GRB 220921A: MeerLICHT afterglow observations
  15. GRB 220921A: Swift-XRT Observations
  16. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  17. LAT GRB220921.46: Global MASTER-Net observations report
  18. GRB 220921A: Tiled Swift observations
  19. Fermi trigger No 685452089: Global MASTER-Net observations report
  20. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  21. IceCube Alert 220918.53: Global MASTER-Net observations report
  22. Fermi trigger No 684894705: Global MASTER-Net observations report
  23. Fermi trigger No 684927323: Global MASTER-Net observations report
  24. Fermi trigger No 684911625: Global MASTER-Net observations report
  25. Konus-Wind detection of GRB 220910A
  26. Fermi trigger No 684716840: Global MASTER-Net observations report
  27. Fermi GRB 220912A: Global MASTER-Net observations report
  28. GRB 220831A: DECam optical counterpart follow-up
  29. GRB 220909A: Swift-XRT observations
  30. GRB 220909A: Swift ToO observations
  31. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  32. GRB 220831A: Gemini-South Infrared Observations
  33. IceCube-220907A: One Candidate Counterpart from the Zwicky Transient Facility
  34. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  35. GRB 220907A: Swift/UVOT Upper Limits
  36. GRB 220831A: ATCA 5/9 GHz radio observations
  37. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  38. Swift GRB220907.59: Global MASTER-Net observations report
  39. IceCube Alert 220907.28: Global MASTER-Net observations report
  40. GRB 220831A: Swift-UVOT Upper Limits
  41. Fermi GRB 220905A: Global MASTER-Net observations report
  42. GRB 220831A: DECam detection of a possible optical counterpart
  43. Fermi GRB 220902A: Global MASTER-Net observations report
  44. GRB 220831A, VLT/HAWK-I near-infrared observations
  45. GRB 220831A: Swift-XRT observations
  46. GRB 220831A: Swift ToO observations
  47. Fermi trigger No 683654200: Global MASTER-Net observations report
  48. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  49. Fermi trigger No 683646997: Global MASTER-Net observations report
  50. Fermi trigger No 683537972: Global MASTER-Net observations report
  51. Fermi trigger No 683476673: Global MASTER-Net observations report
  52. IceCube-220822A: Classification of AT2022saw as a Type Ia supernova
  53. Fermi trigger No 683202084: Global MASTER-Net observations report
  54. Fermi trigger No 683183601: Global MASTER-Net observations report
  55. Fermi trigger No 683152759: Global MASTER-Net observations report
  56. GRB 220826A: Swift/UVOT Detection
  57. GRB 220826A: iTelescope optical afterglow observations
  58. Swift GRB 220826A: Global MASTER-Net observations report
  59. GRB 220825A: Swift/BAT-GUANO detection
  60. IceCube-220822A: One Candidate Counterpart from the Zwicky Transient Facility
  61. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  62. Fermi trigger No 682918137: Global MASTER-Net observations report
  63. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  64. IceCube Alert 220822.85: Global MASTER-Net observations report
  65. GRB 220813A: VLT optical observations and possible host galaxy
  66. GRB 220813A: Swift/UVOT Detection
  67. GRB 220810A: Further Swift-XRT observations
  68. Swift GRB 220813A: Global MASTER-Net observations report
  69. GRB 220810A: Swift-XRT observations
  70. Fermi trigger No 681998863: Global MASTER-Net observations report
  71. GRB 220810A: Swift ToO observations
  72. GRB 220810A: MeerLICHT detection of two afterglow candidates
  73. Fermi trigger No 681890304: Global MASTER-Net observations report
  74. Fermi GRB 220810A: Global MASTER-Net observations report
  75. GRB 220627A: MeerKAT radio observations
  76. Fermi trigger No 681719116: Global MASTER-Net observations report
  77. Fermi trigger No 681633544: Global MASTER-Net observations report
  78. IceCube Alert 220808.33: Global MASTER-Net observations report
  79. Swift GRB220806.76: Global MASTER-Net observations report
  80. Fermi trigger No 681271717: Global MASTER-Net observations report
  81. Fermi trigger No 681212354: Global MASTER-Net observations report
  82. GRB 220730A: Swift-XRT afterglow detection
  83. GRB 220730A: Swift/UVOT Upper Limits
  84. GRB 220730A: Swift-XRT observations
  85. Swift GRB 220730A: Global MASTER-Net observations report
  86. Fermi trigger No 680782656: Global MASTER-Net observations report
  87. Fermi GRB 220728A: Global MASTER-Net observations report
  88. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220728A
  89. Fermi trigger No 680421061: Global MASTER-Net observations report
  90. Fermi GRB 220724A: Global MASTER-Net observations report
  91. Fermi GRB 220721A: Global MASTER-Net observations report
  92. GRB220714B: UVOT detections
  93. GRB 220715B: Swift/UVOT Upper Limits
  94. Swift GRB 220715B: Global MASTER-Net observations report
  95. GRB 220714B: LCO Optical Observations
  96. GRB 220710A: Swift/UVOT Upper Limits
  97. Retraction of GRB 220711B: 10.4 m GTC(+EMIR) observations (GCN 32387)
  98. GRB 220711B: 10.4 m GTC(+EMIR) observations
  99. GRB 220711B: 10.4 m GTC(+EMIR) observations
  100. GRB 220710A: Swift-XRT afterglow detection

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