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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"

37770 results found.

  1. Fermi trigger No 733808041: Global MASTER-Net observations report
  2. Fermi GRB 240402A: Global MASTER-Net observations report
  3. GRB 240402A: Fermi GBM Final Real-time Localization
  4. IBAS Alert n.10651 not a GRB
  5. GRB 240329A: Glowbug gamma-ray detection
  6. GRB 240324A: AstroSat CZTI detection of a short burst
  7. GRB 240331A: AstroSat CZTI detection
  8. GRB 240329A: AstroSat CZTI detection
  9. GRB 240331A: Fermi GBM Final Real-time Localization
  10. GRB 240329A: GRBAlpha detection
  11. Fermi trigger No 733366352: Global MASTER-Net observations report
  12. Fermi GRB 240329A: Global MASTER-Net observations report
  13. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  14. GRB 240329A: Fermi GBM Final Real-time Localization
  15. Fermi GRB 240328B: Global MASTER-Net observations report
  16. Fermi GRB 240328A: Global MASTER-Net observations report
  17. GRB 240328C: Glowbug gamma-ray detection
  18. GRB 240328B: Fermi GBM Final Real-time Localization
  19. GRB 240328A: Fermi GBM Final Real-time Localization
  20. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  21. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  22. X-ray transient EP 240315a: Second epoch Chandra observations
  23. Fermi trigger No 733097506: Global MASTER-Net observations report
  24. Fermi trigger No 733092476: Global MASTER-Net observations report
  25. GRB 240320A: Glowbug gamma-ray detection
  26. Fermi trigger No 732937833: Global MASTER-Net observations report
  27. GRB 240318A: Fermi GBM Observation
  28. Fermi GRB 240320A: Global MASTER-Net observations report
  29. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  30. GRB 240315C / X-ray transient EP240315a: Swift/BAT detection
  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. IPN triangulation of GRB 240315C (consistent with a fast X-ray transient EP240315a)
  35. GRB 240317B: Swift/BAT-GUANO Angular Error Correction
  36. Fermi Gamma-ray Burst Monitor trigger 732299243/240316686 is not a GRB
  37. GRB 240318A: Glowbug gamma-ray detection
  38. GRB 240317C: Glowbug gamma-ray detection
  39. GRB 240318B: Glowbug gamma-ray detection
  40. GRB 240317B: Fermi GBM Observation
  41. X-ray transient EP240315a/AT2024eju: TShAO (Zeiss-1000) observatory optical upper limit
  42. Fermi GRB 240318A: Global MASTER-Net observations report
  43. GRB 240318A: Fermi GBM Final Real-time Localization
  44. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  45. GRB 240317A: AstroSat CZTI detection
  46. GRB 240315B: AstroSat CZTI detection
  47. X-ray transient EP240315a: Kitab observatory optical upper limitns
  48. X-ray transient EP240315a: Montarrenti Observatory optical upper limit
  49. Fermi GRB 240317B: Global MASTER-Net observations report
  50. Fermi GRB 240317A: Global MASTER-Net observations report
  51. GRB 240317B: Fermi GBM Final Real-time Localization
  52. GRB 240317A: Fermi GBM Final Real-time Localization
  53. X-ray transient EP240315a: VLT/X-shooter spectroscopic redshift of z = 4.859
  54. Fermi trigger No 732299243: Global MASTER-Net observations report
  55. GRID detection of GRB 240306A
  56. Changes to the Fermi-GBM Triggering Thresholds
  57. GRB 240315A: Fermi GBM Final Real-time Localization
  58. Fermi GRB 240314A: Global MASTER-Net observations report
  59. GRB 240314A: Fermi GBM Final Real-time Localization
  60. GRB 240312A: Glowbug gamma-ray detection
  61. Swift Trigger 1219905 is not a GRB
  62. GRB 240312A: GECAM detection of a long burst
  63. GRB 240303C: VZLUSAT-2 detection
  64. GRB 240310A: MASTER OT J200702.72-263928.7 inside 3sigma
  65. Fermi trigger No 731839490: Global MASTER-Net observations report
  66. Fermi-LAT gamma-ray observations of IceCube-240307A
  67. GRB 240310B: Glowbug gamma-ray detection
  68. Fermi GRB 240310A: Global MASTER-Net observations report
  69. GRB 240310A: Fermi GBM Final Real-time Localization
  70. GRB 240309A: MAXI/GSC detection
  71. Swift Trigger 1219325 is not a GRB
  72. GRID detection of GRB 240229A (Updated Report)
  73. GRID detection of GRB 240229A
  74. GRB 240308A: Fermi GBM Final Localization
  75. Fermi trigger No 731571927: Global MASTER-Net observations report
  76. GRB 231215A: further radio observations with the VLA
  77. GRB 240306A: Fermi GBM observation
  78. IceCube-240307A - IceCube observation of a high-energy neutrino candidate track-like event
  79. GRB 240229A: Glowbug gamma-ray detection
  80. GRB 240227A (short): Glowbug gamma-ray detection
  81. GRB 240229A: GRBAlpha detection
  82. Konus-Wind detection of GRB 231118A
  83. GRB 240306A: AstroSat CZTI detection
  84. Fermi GRB 240306A: Global MASTER-Net observations report
  85. Fermi GRB 240305A: Global MASTER-Net observations report
  86. GRB 240306A: Swift/BAT-GUANO detection of a burst
  87. GRB 240305A: Fermi GBM observation
  88. Fermi-LAT gamma-ray observations of IceCube-240229A
  89. GRB 240305C: AstroSat CZTI detection of a short burst
  90. GRB 240306A: Fermi GBM Final Real-time Localization
  91. Fermi GRB 240305C: Global MASTER-Net observations report
  92. GRB 240305C: Fermi GBM Final Real-time Localization
  93. GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
  94. GRB 231028C: Glowbug gamma-ray confirmation of a prior burst
  95. GRB 240218A: ALMA detection
  96. GRB 240218A: Chandra Detection and Jet Break Confirmation
  97. GRB 240305B: Fermi GBM Final Localization
  98. Fermi trigger No 731303574: Global MASTER-Net observations report
  99. Konus-Wind detection of GRB 240227A (short/hard)
  100. GRB 240303B: VZLUSAT-2 detection

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