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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"

11617 results found.

  1. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  2. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  3. Fermi trigger No 733097506: Global MASTER-Net observations report
  4. Fermi trigger No 733092476: Global MASTER-Net observations report
  5. GRB 240320A: Glowbug gamma-ray detection
  6. Fermi trigger No 732937833: Global MASTER-Net observations report
  7. GRB 240318A: Fermi GBM Observation
  8. Fermi GRB 240320A: Global MASTER-Net observations report
  9. Fermi trigger No 732657380: Global MASTER-Net observations report
  10. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  11. GRB 240320A: Fermi GBM Final Real-time Localization
  12. Fermi Gamma-ray Burst Monitor trigger 732299243/240316686 is not a GRB
  13. GRB 240318A: Glowbug gamma-ray detection
  14. GRB 240317B: Fermi GBM Observation
  15. Fermi GRB 240318A: Global MASTER-Net observations report
  16. GRB 240318A: Fermi GBM Final Real-time Localization
  17. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  18. GRB 240317A: AstroSat CZTI detection
  19. Fermi GRB 240317B: Global MASTER-Net observations report
  20. Fermi GRB 240317A: Global MASTER-Net observations report
  21. GRB 240317B: Fermi GBM Final Real-time Localization
  22. GRB 240317A: Fermi GBM Final Real-time Localization
  23. Fermi trigger No 732299243: Global MASTER-Net observations report
  24. GRID detection of GRB 240306A
  25. Changes to the Fermi-GBM Triggering Thresholds
  26. GRB 240315A: Fermi GBM Final Real-time Localization
  27. Fermi GRB 240314A: Global MASTER-Net observations report
  28. GRB 240314A: Fermi GBM Final Real-time Localization
  29. GRB 240303C: VZLUSAT-2 detection
  30. GRB 240310A: MASTER OT J200702.72-263928.7 inside 3sigma
  31. Fermi trigger No 731839490: Global MASTER-Net observations report
  32. Fermi-LAT gamma-ray observations of IceCube-240307A
  33. Fermi GRB 240310A: Global MASTER-Net observations report
  34. GRB 240310A: Fermi GBM Final Real-time Localization
  35. GRID detection of GRB 240229A (Updated Report)
  36. GRID detection of GRB 240229A
  37. GRB 240308A: Fermi GBM Final Localization
  38. Fermi trigger No 731571927: Global MASTER-Net observations report
  39. GRB 231215A: further radio observations with the VLA
  40. GRB 240306A: Fermi GBM observation
  41. IceCube-240307A - IceCube observation of a high-energy neutrino candidate track-like event
  42. GRB 240229A: Glowbug gamma-ray detection
  43. GRB 240227A (short): Glowbug gamma-ray detection
  44. GRB 240229A: GRBAlpha detection
  45. Konus-Wind detection of GRB 231118A
  46. GRB 240306A: AstroSat CZTI detection
  47. Fermi GRB 240306A: Global MASTER-Net observations report
  48. Fermi GRB 240305A: Global MASTER-Net observations report
  49. GRB 240306A: Swift/BAT-GUANO detection of a burst
  50. GRB 240305A: Fermi GBM observation
  51. Fermi-LAT gamma-ray observations of IceCube-240229A
  52. GRB 240305C: AstroSat CZTI detection of a short burst
  53. GRB 240306A: Fermi GBM Final Real-time Localization
  54. Fermi GRB 240305C: Global MASTER-Net observations report
  55. GRB 240305C: Fermi GBM Final Real-time Localization
  56. GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
  57. GRB 240305B: Fermi GBM Final Localization
  58. Fermi trigger No 731303574: Global MASTER-Net observations report
  59. Konus-Wind detection of GRB 240227A (short/hard)
  60. GRB 240303B: VZLUSAT-2 detection
  61. GRB 240229A: VZLUSAT-2 detection
  62. Improved IPN triangulation of GRB 240227A (short)
  63. IPN triangulation of GRB 240229A
  64. GRB 240305A: Fermi GBM Final Real-time Localization
  65. Konus-Wind detection of GRB 240303B
  66. IPN triangulation of GRB 240303B
  67. GRB 240303B: Fermi GBM Detection
  68. GRB 240303B: CALET Gamma-Ray Burst Monitor detection
  69. Fermi trigger No 731161136: Global MASTER-Net observations report
  70. GRB 240303C: BALROG localization (Fermi Trigger 731189113 / GRB 240303837)
  71. GRB 240303B: BALROG localization (Fermi Trigger 731161136 / GRB 240303513)
  72. GRB 240303B: Fermi GBM Final Localization
  73. GRB 240229A: DDOTI Upper Limits on the Afterglow
  74. GRB 240229A: CALET Gamma-Ray Burst Monitor detection
  75. IceCube-240229A - IceCube observation of a high-energy neutrino candidate track-like event
  76. Fermi GRB 240229A: Global MASTER-Net observations report
  77. GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588)
  78. GRB 240229A: Fermi GBM Final Real-time Localization
  79. GRB 240226A: GRBAlpha detection
  80. Fermi GRB 240227A: Global MASTER-Net observations report
  81. IPN triangulation of GRB 240227A (short)
  82. Fermi GRB 240226A: Global MASTER-Net observations report
  83. GRB 240227A: Fermi GBM Final Real-time Localization
  84. Fermi Gamma-ray Burst Monitor trigger 730618809/240226236 is not a GRB
  85. GRB 240226B: Fermi GBM Final Real-time Localization
  86. GRB 240226A: Fermi GBM Final Real-time Localization
  87. GRB 240222A: ATCA radio observations
  88. Fermi trigger No 730618809: Global MASTER-Net observations report
  89. Transient EPW20240219aa: Xinglong-2.16m optical upper limit
  90. GRB 240225A: Swift/BAT-GUANO detection of a short burst
  91. GRB 240222A: GRBAlpha detection
  92. Transient EPW20240219aa: Mondy optical observations
  93. Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations
  94. Insight-HXMT/HE Sub-Threshold Detection of Transient EPW20240219aa
  95. Swift BAT Sub-Threshold Detection of EPW20240219aa
  96. GRB 240222A: GECAM detection of a burst
  97. GRB 240222A: Fermi GBM Observation
  98. Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB
  99. Fermi GRB 240222A: Global MASTER-Net observations report
  100. EPW20240219aa is Likely a GRB Event

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