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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"

11539 results found.

  1. GRB 240403B: Glowbug gamma-ray detection
  2. GRB 240403A: Glowbug gamma-ray detection
  3. GRB 240403A: Fermi GBM Detection
  4. Fermi GRB 240404A: Global MASTER-Net observations report
  5. GRB 240404A: Fermi GBM Final Real-time Localization
  6. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  7. Fermi trigger No 733808041: Global MASTER-Net observations report
  8. Fermi GRB 240402A: Global MASTER-Net observations report
  9. GRB 240402A: Fermi GBM Final Real-time Localization
  10. GRB 240329A: Glowbug gamma-ray detection
  11. GRB 240331A: AstroSat CZTI detection
  12. GRB 240329A: AstroSat CZTI detection
  13. GRB 240331A: Fermi GBM Final Real-time Localization
  14. GRB 240329A: GRBAlpha detection
  15. Fermi trigger No 733366352: Global MASTER-Net observations report
  16. Fermi GRB 240329A: Global MASTER-Net observations report
  17. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  18. GRB 240329A: Fermi GBM Final Real-time Localization
  19. Fermi GRB 240328B: Global MASTER-Net observations report
  20. Fermi GRB 240328A: Global MASTER-Net observations report
  21. GRB 240328B: Fermi GBM Final Real-time Localization
  22. GRB 240328A: Fermi GBM Final Real-time Localization
  23. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  24. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  25. Fermi trigger No 733097506: Global MASTER-Net observations report
  26. Fermi trigger No 733092476: Global MASTER-Net observations report
  27. GRB 240320A: Glowbug gamma-ray detection
  28. Fermi trigger No 732937833: Global MASTER-Net observations report
  29. GRB 240318A: Fermi GBM Observation
  30. Fermi GRB 240320A: Global MASTER-Net observations report
  31. Fermi trigger No 732657380: Global MASTER-Net observations report
  32. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  33. GRB 240320A: Fermi GBM Final Real-time Localization
  34. Fermi Gamma-ray Burst Monitor trigger 732299243/240316686 is not a GRB
  35. GRB 240318A: Glowbug gamma-ray detection
  36. GRB 240317B: Fermi GBM Observation
  37. Fermi GRB 240318A: Global MASTER-Net observations report
  38. GRB 240318A: Fermi GBM Final Real-time Localization
  39. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  40. GRB 240317A: AstroSat CZTI detection
  41. Fermi GRB 240317B: Global MASTER-Net observations report
  42. Fermi GRB 240317A: Global MASTER-Net observations report
  43. GRB 240317B: Fermi GBM Final Real-time Localization
  44. GRB 240317A: Fermi GBM Final Real-time Localization
  45. Fermi trigger No 732299243: Global MASTER-Net observations report
  46. GRID detection of GRB 240306A
  47. Changes to the Fermi-GBM Triggering Thresholds
  48. GRB 240315A: Fermi GBM Final Real-time Localization
  49. Fermi GRB 240314A: Global MASTER-Net observations report
  50. GRB 240314A: Fermi GBM Final Real-time Localization
  51. GRB 240303C: VZLUSAT-2 detection
  52. GRB 240310A: MASTER OT J200702.72-263928.7 inside 3sigma
  53. Fermi trigger No 731839490: Global MASTER-Net observations report
  54. Fermi-LAT gamma-ray observations of IceCube-240307A
  55. Fermi GRB 240310A: Global MASTER-Net observations report
  56. GRB 240310A: Fermi GBM Final Real-time Localization
  57. GRID detection of GRB 240229A (Updated Report)
  58. GRID detection of GRB 240229A
  59. GRB 240308A: Fermi GBM Final Localization
  60. Fermi trigger No 731571927: Global MASTER-Net observations report
  61. GRB 231215A: further radio observations with the VLA
  62. GRB 240306A: Fermi GBM observation
  63. IceCube-240307A - IceCube observation of a high-energy neutrino candidate track-like event
  64. GRB 240229A: Glowbug gamma-ray detection
  65. GRB 240227A (short): Glowbug gamma-ray detection
  66. GRB 240229A: GRBAlpha detection
  67. Konus-Wind detection of GRB 231118A
  68. GRB 240306A: AstroSat CZTI detection
  69. Fermi GRB 240306A: Global MASTER-Net observations report
  70. Fermi GRB 240305A: Global MASTER-Net observations report
  71. GRB 240306A: Swift/BAT-GUANO detection of a burst
  72. GRB 240305A: Fermi GBM observation
  73. Fermi-LAT gamma-ray observations of IceCube-240229A
  74. GRB 240305C: AstroSat CZTI detection of a short burst
  75. GRB 240306A: Fermi GBM Final Real-time Localization
  76. Fermi GRB 240305C: Global MASTER-Net observations report
  77. GRB 240305C: Fermi GBM Final Real-time Localization
  78. GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
  79. GRB 240305B: Fermi GBM Final Localization
  80. Fermi trigger No 731303574: Global MASTER-Net observations report
  81. Konus-Wind detection of GRB 240227A (short/hard)
  82. GRB 240303B: VZLUSAT-2 detection
  83. GRB 240229A: VZLUSAT-2 detection
  84. Improved IPN triangulation of GRB 240227A (short)
  85. IPN triangulation of GRB 240229A
  86. GRB 240305A: Fermi GBM Final Real-time Localization
  87. Konus-Wind detection of GRB 240303B
  88. IPN triangulation of GRB 240303B
  89. GRB 240303B: Fermi GBM Detection
  90. GRB 240303B: CALET Gamma-Ray Burst Monitor detection
  91. Fermi trigger No 731161136: Global MASTER-Net observations report
  92. GRB 240303C: BALROG localization (Fermi Trigger 731189113 / GRB 240303837)
  93. GRB 240303B: BALROG localization (Fermi Trigger 731161136 / GRB 240303513)
  94. GRB 240303B: Fermi GBM Final Localization
  95. GRB 240229A: DDOTI Upper Limits on the Afterglow
  96. GRB 240229A: CALET Gamma-Ray Burst Monitor detection
  97. IceCube-240229A - IceCube observation of a high-energy neutrino candidate track-like event
  98. Fermi GRB 240229A: Global MASTER-Net observations report
  99. GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588)
  100. GRB 240229A: Fermi GBM Final Real-time Localization

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