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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"

39320 results found.

  1. GRB 240315A: Fermi GBM Final Real-time Localization
  2. Fermi GRB 240314A: Global MASTER-Net observations report
  3. GRB 240314A: Fermi GBM Final Real-time Localization
  4. GRB 240312A: Glowbug gamma-ray detection
  5. Swift Trigger 1219905 is not a GRB
  6. GRB 240312A: GECAM detection of a long burst
  7. GRB 240303C: VZLUSAT-2 detection
  8. GRB 240310A: MASTER OT J200702.72-263928.7 inside 3sigma
  9. Fermi trigger No 731839490: Global MASTER-Net observations report
  10. Fermi-LAT gamma-ray observations of IceCube-240307A
  11. GRB 240310B: Glowbug gamma-ray detection
  12. Fermi GRB 240310A: Global MASTER-Net observations report
  13. Swift GRB240309.61: Global MASTER-Net observations report
  14. GRB 240310A: Fermi GBM Final Real-time Localization
  15. GRB 240309A: MAXI/GSC detection
  16. Swift Trigger 1219325 is not a GRB
  17. GRID detection of GRB 240229A (Updated Report)
  18. GRID detection of GRB 240229A
  19. GRB 240308A: Fermi GBM Final Localization
  20. Fermi trigger No 731571927: Global MASTER-Net observations report
  21. GRB 231215A: further radio observations with the VLA
  22. GRB 240306A: Fermi GBM observation
  23. IceCube-240307A - IceCube observation of a high-energy neutrino candidate track-like event
  24. GRB 240229A: Glowbug gamma-ray detection
  25. GRB 240227A (short): Glowbug gamma-ray detection
  26. IceCube Alert 240307.32: Global MASTER-Net observations report
  27. GRB 240229A: GRBAlpha detection
  28. Konus-Wind detection of GRB 231118A
  29. GRB 240306A: AstroSat CZTI detection
  30. Fermi GRB 240306A: Global MASTER-Net observations report
  31. Fermi GRB 240305A: Global MASTER-Net observations report
  32. GRB 240306A: Swift/BAT-GUANO detection of a burst
  33. GRB 240305A: Fermi GBM observation
  34. Fermi-LAT gamma-ray observations of IceCube-240229A
  35. GRB 240305C: AstroSat CZTI detection of a short burst
  36. GRB 240306A: Fermi GBM Final Real-time Localization
  37. Swift GRB240305.18: Global MASTER-Net observations report
  38. Swift GRB240305.16: Global MASTER-Net observations report
  39. Fermi GRB 240305C: Global MASTER-Net observations report
  40. GRB 240305C: Fermi GBM Final Real-time Localization
  41. GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
  42. GRB 231028C: Glowbug gamma-ray confirmation of a prior burst
  43. GRB 240218A: ALMA detection
  44. GRB 240218A: Chandra Detection and Jet Break Confirmation
  45. GRB 240305B: Fermi GBM Final Localization
  46. Fermi trigger No 731303574: Global MASTER-Net observations report
  47. Konus-Wind detection of GRB 240227A (short/hard)
  48. GRB 240303B: VZLUSAT-2 detection
  49. GRB 240229A: VZLUSAT-2 detection
  50. Improved IPN triangulation of GRB 240227A (short)
  51. IPN triangulation of GRB 240229A
  52. GRB 240305A: Fermi GBM Final Real-time Localization
  53. Swift Trigger 1218701: Yes, we triggered on Swift J151857.0-572147 again
  54. Swift Trigger 1218696: Another trigger on Swift J151857.0-572147
  55. Transient EPW20240219aa: Optical observations with LDT
  56. Konus-Wind detection of GRB 240303B
  57. Swift Trigger 1218645: Another detection of Swift J151857.0-572147
  58. IPN triangulation of GRB 240303B
  59. GRB 240303B: Fermi GBM Detection
  60. GRB 240225B: Swift-XRT afterglow detection
  61. Swift detection of Swift J151857.0-572147
  62. GRB 240303B: CALET Gamma-Ray Burst Monitor detection
  63. Fermi trigger No 731161136: Global MASTER-Net observations report
  64. GRB 240303C: BALROG localization (Fermi Trigger 731189113 / GRB 240303837)
  65. Swift GRB 240303A: Global MASTER-Net observations report
  66. Swift J151857.0-572147: Confirmation of a new galactic transient
  67. GRB 240215A: Swift-XRT afterglow detection
  68. GRB 240303B: BALROG localization (Fermi Trigger 731161136 / GRB 240303513)
  69. GRB 240303B: Fermi GBM Final Localization
  70. GRB 240303A: Swift detection of a burst
  71. GRB 240225B: Glowbug gamma-ray detection
  72. GRB 240225C: Glowbug gamma-ray detection
  73. GRB 240225A (short): Glowbug gamma-ray detection
  74. GRB 240229A: DDOTI Upper Limits on the Afterglow
  75. GRB 240218A: NOEMA upper limit
  76. GRB 240229A: CALET Gamma-Ray Burst Monitor detection
  77. IceCube-240229A - IceCube observation of a high-energy neutrino candidate track-like event
  78. GRB 240225B: further SAO RAS optical observations
  79. Fermi GRB 240229A: Global MASTER-Net observations report
  80. IceCube Alert 240229.66: Global MASTER-Net observations report
  81. GRB 240225B: Swift ToO observations
  82. Konus-Wind detection of GRB 240225B (long)
  83. GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588)
  84. GRB 240229A: Fermi GBM Final Real-time Localization
  85. GRB 240225B: VLT/X-shooter redshift
  86. GRB 240225B : MITSuME Akeno optical afterglow candidate detection
  87. GRB 240225B: 3.6m DOT observation
  88. GRB 240225B: WINTER near-IR observations and upper limits
  89. GRB 240225B: SAO RAS optical observations
  90. GRB 240226A: GRBAlpha detection
  91. GRB 240225B: Mondy afterglow observations
  92. Fermi GRB 240227A: Global MASTER-Net observations report
  93. GRB 240225B: Liverpool Telescope afterglow observations
  94. Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up
  95. Swift Trigger 1217799 is not a GRB
  96. IPN triangulation of GRB 240227A (short)
  97. GRB 240225B: Liverpool Telescope optical afterglow observations
  98. GRB 240225B: NOT optical observations
  99. GRB 240218A: CMO SAI NIR upper limit
  100. Fermi GRB 240226A: Global MASTER-Net observations report

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