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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"

36201 results found.

  1. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  2. GRB 240317A: AstroSat CZTI detection
  3. GRB 240315B: AstroSat CZTI detection
  4. X-ray transient EP240315a: Kitab observatory optical upper limitns
  5. X-ray transient EP240315a: Montarrenti Observatory optical upper limit
  6. Fermi GRB 240317B: Global MASTER-Net observations report
  7. Fermi GRB 240317A: Global MASTER-Net observations report
  8. GRB 240317B: Fermi GBM Final Real-time Localization
  9. GRB 240317A: Fermi GBM Final Real-time Localization
  10. X-ray transient EP240315a: VLT/X-shooter spectroscopic redshift of z = 4.859
  11. GRID detection of GRB 240306A
  12. Changes to the Fermi-GBM Triggering Thresholds
  13. GRB 240315A: Fermi GBM Final Real-time Localization
  14. Fermi GRB 240314A: Global MASTER-Net observations report
  15. GRB 240314A: Fermi GBM Final Real-time Localization
  16. GRB 240312A: Glowbug gamma-ray detection
  17. Swift Trigger 1219905 is not a GRB
  18. GRB 240312A: GECAM detection of a long burst
  19. GRB 240303C: VZLUSAT-2 detection
  20. GRB 240310A: MASTER OT J200702.72-263928.7 inside 3sigma
  21. GRB 240310B: Glowbug gamma-ray detection
  22. Fermi GRB 240310A: Global MASTER-Net observations report
  23. GRB 240310A: Fermi GBM Final Real-time Localization
  24. GRB 240309A: MAXI/GSC detection
  25. Swift Trigger 1219325 is not a GRB
  26. IceCube-240307A: Upper limits from a search for additional neutrino events in IceCube
  27. GRID detection of GRB 240229A (Updated Report)
  28. GRID detection of GRB 240229A
  29. GRB 240308A: Fermi GBM Final Localization
  30. GRB 231215A: further radio observations with the VLA
  31. GRB 240306A: Fermi GBM observation
  32. GRB 240229A: Glowbug gamma-ray detection
  33. GRB 240227A (short): Glowbug gamma-ray detection
  34. GRB 240229A: GRBAlpha detection
  35. Konus-Wind detection of GRB 231118A
  36. GRB 240306A: AstroSat CZTI detection
  37. Fermi GRB 240306A: Global MASTER-Net observations report
  38. Fermi GRB 240305A: Global MASTER-Net observations report
  39. GRB 240306A: Swift/BAT-GUANO detection of a burst
  40. GRB 240305A: Fermi GBM observation
  41. GRB 240305C: AstroSat CZTI detection of a short burst
  42. GRB 240306A: Fermi GBM Final Real-time Localization
  43. Fermi GRB 240305C: Global MASTER-Net observations report
  44. GRB 240305C: Fermi GBM Final Real-time Localization
  45. GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
  46. GRB 231028C: Glowbug gamma-ray confirmation of a prior burst
  47. GRB 240218A: ALMA detection
  48. GRB 240218A: Chandra Detection and Jet Break Confirmation
  49. GRB 240305B: Fermi GBM Final Localization
  50. Konus-Wind detection of GRB 240227A (short/hard)
  51. GRB 240303B: VZLUSAT-2 detection
  52. GRB 240229A: VZLUSAT-2 detection
  53. Improved IPN triangulation of GRB 240227A (short)
  54. IPN triangulation of GRB 240229A
  55. GRB 240305A: Fermi GBM Final Real-time Localization
  56. Konus-Wind detection of GRB 240303B
  57. IPN triangulation of GRB 240303B
  58. GRB 240303B: Fermi GBM Detection
  59. GRB 240225B: Swift-XRT afterglow detection
  60. Swift detection of Swift J151857.0-572147
  61. GRB 240303B: CALET Gamma-Ray Burst Monitor detection
  62. GRB 240303C: BALROG localization (Fermi Trigger 731189113 / GRB 240303837)
  63. Swift GRB 240303A: Global MASTER-Net observations report
  64. Swift J151857.0-572147: Confirmation of a new galactic transient
  65. GRB 240215A: Swift-XRT afterglow detection
  66. GRB 240303B: BALROG localization (Fermi Trigger 731161136 / GRB 240303513)
  67. GRB 240303B: Fermi GBM Final Localization
  68. GRB 240303A: Swift detection of a burst
  69. GRB 240225B: Glowbug gamma-ray detection
  70. IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
  71. GRB 240225C: Glowbug gamma-ray detection
  72. GRB 240225A (short): Glowbug gamma-ray detection
  73. GRB 240229A: DDOTI Upper Limits on the Afterglow
  74. GRB 240218A: NOEMA upper limit
  75. GRB 240229A: CALET Gamma-Ray Burst Monitor detection
  76. GRB 240225B: further SAO RAS optical observations
  77. Fermi GRB 240229A: Global MASTER-Net observations report
  78. GRB 240225B: Swift ToO observations
  79. Konus-Wind detection of GRB 240225B (long)
  80. GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588)
  81. GRB 240229A: Fermi GBM Final Real-time Localization
  82. GRB 240225B: VLT/X-shooter redshift
  83. GRB 240225B : MITSuME Akeno optical afterglow candidate detection
  84. GRB 240225B: 3.6m DOT observation
  85. GRB 240225B: WINTER near-IR observations and upper limits
  86. GRB 240225B: SAO RAS optical observations
  87. GRB 240226A: GRBAlpha detection
  88. GRB 240225B: Mondy afterglow observations
  89. Fermi GRB 240227A: Global MASTER-Net observations report
  90. GRB 240225B: Liverpool Telescope afterglow observations
  91. Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up
  92. Swift Trigger 1217799 is not a GRB
  93. IPN triangulation of GRB 240227A (short)
  94. GRB 240225B: Liverpool Telescope optical afterglow observations
  95. GRB 240225B: NOT optical observations
  96. GRB 240218A: CMO SAI NIR upper limit
  97. Fermi GRB 240226A: Global MASTER-Net observations report
  98. GRB 240227A: Fermi GBM Final Real-time Localization
  99. Fermi Gamma-ray Burst Monitor trigger 730618809/240226236 is not a GRB
  100. GRB 240225B: Nanshan/HMT optical afterglow detection

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