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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"

11059 results found.

  1. GRB 240415A: Fermi GBM Final Real-time Localization
  2. Fermi trigger No 734754044: Global MASTER-Net observations report
  3. IPN triangulation of GRB 240411A
  4. Fermi-LAT gamma-ray observations of IceCube-240412A
  5. IceCube-240412A - IceCube observation of a high-energy neutrino candidate track-like event
  6. GRB 240411A: GRBAlpha detection
  7. GRB 240405A: Glowbug gamma-ray detection
  8. GRB 240411A: Fermi GBM Final Real-time Localization
  9. GRB 240405A: GRBAlpha detection
  10. Fermi GRB 240408A: Global MASTER-Net observations report
  11. GRB 240408A: Fermi GBM Final Real-time Localization
  12. GRB 240407A: BALROG localization (Fermi Trigger 734144396 / GRB 240407042)
  13. Fermi GRB 240407A: Global MASTER-Net observations report
  14. GRB 240407A: Fermi GBM Final Real-time Localization
  15. Fermi-LAT gamma-ray observations of IceCube-240327B
  16. Fermi-LAT gamma-ray observations of IceCube-240327A
  17. Fermi GRB 240405B: Global MASTER-Net observations report
  18. GRB 240405B: Fermi GBM Final Real-time Localization
  19. GRB 240405A: Fermi GBM Final Real-time Localization
  20. GRB 240331A: GRBAlpha detection
  21. GRB 240403B: Glowbug gamma-ray detection
  22. GRB 240403A: Glowbug gamma-ray detection
  23. GRB 240403A: Fermi GBM Detection
  24. Fermi GRB 240404A: Global MASTER-Net observations report
  25. GRB 240404A: Fermi GBM Final Real-time Localization
  26. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  27. Fermi trigger No 733808041: Global MASTER-Net observations report
  28. Fermi GRB 240402A: Global MASTER-Net observations report
  29. GRB 240402A: Fermi GBM Final Real-time Localization
  30. GRB 240329A: Glowbug gamma-ray detection
  31. GRB 240331A: AstroSat CZTI detection
  32. GRB 240329A: AstroSat CZTI detection
  33. GRB 240331A: Fermi GBM Final Real-time Localization
  34. GRB 240329A: GRBAlpha detection
  35. Fermi trigger No 733366352: Global MASTER-Net observations report
  36. Fermi GRB 240329A: Global MASTER-Net observations report
  37. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  38. GRB 240329A: Fermi GBM Final Real-time Localization
  39. Fermi GRB 240328B: Global MASTER-Net observations report
  40. Fermi GRB 240328A: Global MASTER-Net observations report
  41. GRB 240328B: Fermi GBM Final Real-time Localization
  42. GRB 240328A: Fermi GBM Final Real-time Localization
  43. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  44. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  45. Fermi trigger No 733097506: Global MASTER-Net observations report
  46. Fermi trigger No 733092476: Global MASTER-Net observations report
  47. GRB 240320A: Glowbug gamma-ray detection
  48. Fermi trigger No 732937833: Global MASTER-Net observations report
  49. GRB 240318A: Fermi GBM Observation
  50. Fermi GRB 240320A: Global MASTER-Net observations report
  51. Fermi trigger No 732657380: Global MASTER-Net observations report
  52. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  53. GRB 240320A: Fermi GBM Final Real-time Localization
  54. Fermi Gamma-ray Burst Monitor trigger 732299243/240316686 is not a GRB
  55. GRB 240318A: Glowbug gamma-ray detection
  56. GRB 240317B: Fermi GBM Observation
  57. Fermi GRB 240318A: Global MASTER-Net observations report
  58. GRB 240318A: Fermi GBM Final Real-time Localization
  59. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  60. GRB 240317A: AstroSat CZTI detection
  61. Fermi GRB 240317B: Global MASTER-Net observations report
  62. Fermi GRB 240317A: Global MASTER-Net observations report
  63. GRB 240317B: Fermi GBM Final Real-time Localization
  64. GRB 240317A: Fermi GBM Final Real-time Localization
  65. Fermi trigger No 732299243: Global MASTER-Net observations report
  66. GRID detection of GRB 240306A
  67. Changes to the Fermi-GBM Triggering Thresholds
  68. GRB 240315A: Fermi GBM Final Real-time Localization
  69. Fermi GRB 240314A: Global MASTER-Net observations report
  70. GRB 240314A: Fermi GBM Final Real-time Localization
  71. GRB 240303C: VZLUSAT-2 detection
  72. GRB 240310A: MASTER OT J200702.72-263928.7 inside 3sigma
  73. Fermi trigger No 731839490: Global MASTER-Net observations report
  74. Fermi-LAT gamma-ray observations of IceCube-240307A
  75. Fermi GRB 240310A: Global MASTER-Net observations report
  76. GRB 240310A: Fermi GBM Final Real-time Localization
  77. GRID detection of GRB 240229A (Updated Report)
  78. GRID detection of GRB 240229A
  79. GRB 240308A: Fermi GBM Final Localization
  80. Fermi trigger No 731571927: Global MASTER-Net observations report
  81. GRB 231215A: further radio observations with the VLA
  82. GRB 240306A: Fermi GBM observation
  83. IceCube-240307A - IceCube observation of a high-energy neutrino candidate track-like event
  84. GRB 240229A: Glowbug gamma-ray detection
  85. GRB 240227A (short): Glowbug gamma-ray detection
  86. GRB 240229A: GRBAlpha detection
  87. Konus-Wind detection of GRB 231118A
  88. GRB 240306A: AstroSat CZTI detection
  89. Fermi GRB 240306A: Global MASTER-Net observations report
  90. Fermi GRB 240305A: Global MASTER-Net observations report
  91. GRB 240306A: Swift/BAT-GUANO detection of a burst
  92. GRB 240305A: Fermi GBM observation
  93. Fermi-LAT gamma-ray observations of IceCube-240229A
  94. GRB 240305C: AstroSat CZTI detection of a short burst
  95. GRB 240306A: Fermi GBM Final Real-time Localization
  96. Fermi GRB 240305C: Global MASTER-Net observations report
  97. GRB 240305C: Fermi GBM Final Real-time Localization
  98. GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
  99. GRB 240305B: Fermi GBM Final Localization
  100. Fermi trigger No 731303574: Global MASTER-Net observations report

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