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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"

11621 results found.

  1. GRB 240504A: BALROG localization (Fermi Trigger 736492377 / GRB 240504217)
  2. GRB 240504A: Fermi GBM Final Real-time Localization
  3. Fermi trigger No 736387941: Global MASTER-Net observations report
  4. GRB 240502A: GOTO optical upper limit
  5. Fermi trigger No 736379109: Global MASTER-Net observations report
  6. GRB 240502A: Fermi GBM Observation
  7. GRB 240502C: GOTO possible optical counterpart candidates
  8. Fermi GRB 240502B: Global MASTER-Net observations report
  9. GRB 240502C: Fermi GBM Final Localization
  10. Fermi GRB 240502A: Global MASTER-Net observations report
  11. GRB 240430A: GRBAlpha detection
  12. GRB 240502B: Fermi GBM Final Real-time Localization
  13. GRB 240502A: Fermi GBM Final Real-time Localization
  14. Fermi GRB 240501A: Global MASTER-Net observations report
  15. Fermi trigger No 736197684: Global MASTER-Net observations report
  16. GRB 240425A: VZLUSAT-2 detection
  17. GRB240430A: Fermi GBM Final Localization
  18. GRB 240501A: Fermi GBM Final Real-time Localization
  19. GRB 240407A: VZLUSAT-2 detection
  20. GRB 240425A: GRBAlpha detection
  21. Fermi-LAT gamma-ray observations of IceCube-240424A
  22. GRB 240429A: Fermi GBM Final Real-time Localization
  23. Fermi GRB 240428A: Global MASTER-Net observations report
  24. GRB 240428A: Fermi GBM Final Real-time Localization
  25. GRB 240425A: Fermi GBM Final Real-time Localization
  26. Fermi trigger No 735697285: Global MASTER-Net observations report
  27. GRB 240422A: Glowbug gamma-ray detection
  28. IceCube-240424A - IceCube observation of a high-energy neutrino candidate track-like event
  29. GRB 240421B: GRBAlpha detection
  30. LIGO/Virgo/KAGRA S240422ed: Upper limits from Fermi-GBM Observations
  31. Fermi trigger No 735470374: Global MASTER-Net observations report
  32. GRB 240421A: Glowbug gamma-ray detection
  33. GRB 240414A: radio detection with the VLA
  34. Fermi-LAT gamma-ray observations of IceCube-240419A
  35. Fermi GRB 240422A: Global MASTER-Net observations report
  36. GRB 240421B: AstroSat CZTI detection
  37. GRB 240422A: Fermi GBM Final Real-time Localization
  38. Fermi GRB 240421B: Global MASTER-Net observations report
  39. GRB 240421B: Fermi GBM Observation
  40. Fermi GRB 240421A: Global MASTER-Net observations report
  41. GRB 240421A: Fermi GBM Final Real-time Localization
  42. Fermi trigger No 735280430: Global MASTER-Net observations report
  43. IceCube-240419A - IceCube observation of a high-energy neutrino candidate track-like event
  44. IceCube-240419A - IceCube observation of a high-energy neutrino candidate track-like event
  45. Fermi trigger No 735089036: Global MASTER-Net observations report
  46. GRB 240411A: GOTO early optical upper limits
  47. Fermi GRB 240417A: Global MASTER-Net observations report
  48. Improved IPN triangulation of GRB 240411A
  49. GRB 240417A: Fermi GBM Final Real-time Localization
  50. GRB 240415A: Glowbug gamma-ray detection
  51. GRB 240414A: Glowbug gamma-ray detection
  52. GRB 240411A: Glowbug gamma-ray detection
  53. GRB 240415A: Fermi GBM Observation
  54. GRB 240415A: Earliest optical followup with the Kinder observations
  55. GRB 240415A: OHP/T193 optical observations
  56. GRB 240415A: optical afterglow detection from the INAF Asiago Observatory
  57. GRB 240415A: SAO RAS optical observations
  58. GRB 240414A: Fermi GBM Observation
  59. Fermi GRB 240415A: Global MASTER-Net observations report
  60. GRB 240415A: Mondy optical transient detection
  61. GRB 240414B: Fermi GBM Final Real-time Localization
  62. GRB 240415A: Swift detection of a burst
  63. GRB 240415A: Fermi GBM Final Real-time Localization
  64. Fermi trigger No 734754044: Global MASTER-Net observations report
  65. IPN triangulation of GRB 240411A
  66. Fermi-LAT gamma-ray observations of IceCube-240412A
  67. IceCube-240412A - IceCube observation of a high-energy neutrino candidate track-like event
  68. GRB 240411A: GRBAlpha detection
  69. GRB 240405A: Glowbug gamma-ray detection
  70. GRB 240411A: Fermi GBM Final Real-time Localization
  71. GRB 240405A: GRBAlpha detection
  72. Fermi GRB 240408A: Global MASTER-Net observations report
  73. GRB 240408A: Fermi GBM Final Real-time Localization
  74. GRB 240407A: BALROG localization (Fermi Trigger 734144396 / GRB 240407042)
  75. Fermi GRB 240407A: Global MASTER-Net observations report
  76. GRB 240407A: Fermi GBM Final Real-time Localization
  77. Fermi-LAT gamma-ray observations of IceCube-240327B
  78. Fermi-LAT gamma-ray observations of IceCube-240327A
  79. Fermi GRB 240405B: Global MASTER-Net observations report
  80. GRB 240405B: Fermi GBM Final Real-time Localization
  81. GRB 240405A: Fermi GBM Final Real-time Localization
  82. GRB 240331A: GRBAlpha detection
  83. GRB 240403B: Glowbug gamma-ray detection
  84. GRB 240403A: Glowbug gamma-ray detection
  85. GRB 240403A: Fermi GBM Detection
  86. Fermi GRB 240404A: Global MASTER-Net observations report
  87. GRB 240404A: Fermi GBM Final Real-time Localization
  88. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  89. Fermi trigger No 733808041: Global MASTER-Net observations report
  90. Fermi GRB 240402A: Global MASTER-Net observations report
  91. GRB 240402A: Fermi GBM Final Real-time Localization
  92. GRB 240329A: Glowbug gamma-ray detection
  93. GRB 240331A: AstroSat CZTI detection
  94. GRB 240329A: AstroSat CZTI detection
  95. GRB 240331A: Fermi GBM Final Real-time Localization
  96. GRB 240329A: GRBAlpha detection
  97. Fermi trigger No 733366352: Global MASTER-Net observations report
  98. Fermi GRB 240329A: Global MASTER-Net observations report
  99. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  100. GRB 240329A: Fermi GBM Final Real-time Localization

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