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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"

24534 results found.

  1. X-ray transient EP240315a: Ondrejov D50 optical limit
  2. Fermi trigger No 733092476: Global MASTER-Net observations report
  3. Fermi trigger No 732937833: Global MASTER-Net observations report
  4. GRB 240318A: Fermi GBM Observation
  5. Fermi GRB 240320A: Global MASTER-Net observations report
  6. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  7. GRB 240315C / X-ray transient EP240315a: Swift/BAT detection
  8. Fermi trigger No 732657380: Global MASTER-Net observations report
  9. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  10. GRB 240320A: Fermi GBM Final Real-time Localization
  11. IPN triangulation of GRB 240315C (consistent with a fast X-ray transient EP240315a)
  12. GRB 240317B: Swift/BAT-GUANO Angular Error Correction
  13. X-ray transient EP 240315a: Chandra observations
  14. GRB 240317C: Glowbug gamma-ray detection
  15. GRB 240318B: Glowbug gamma-ray detection
  16. X-ray transient EP240315a: PRIME near infrared detection
  17. GRB 240317B: Fermi GBM Observation
  18. X-ray transient EP240315a: EP-FXT detection of the X-ray afterglow
  19. Fermi GRB 240318A: Global MASTER-Net observations report
  20. GRB 240318A: Fermi GBM Final Real-time Localization
  21. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  22. GRB 240317A: AstroSat CZTI detection
  23. Fermi GRB 240317B: Global MASTER-Net observations report
  24. Fermi GRB 240317A: Global MASTER-Net observations report
  25. GRB 240317B: Fermi GBM Final Real-time Localization
  26. GRB 240317A: Fermi GBM Final Real-time Localization
  27. X-ray transient EP240315a: Kinder follow-up observations for AT 2024eju with Lulin observatory
  28. X-ray transient EP240315a: Nanshan/HMT optical upper limit
  29. Fermi trigger No 732299243: Global MASTER-Net observations report
  30. Changes to the Fermi-GBM Triggering Thresholds
  31. GRB 240315A: Fermi GBM Final Real-time Localization
  32. Fermi GRB 240314A: Global MASTER-Net observations report
  33. GRB 240314A: Fermi GBM Final Real-time Localization
  34. GRB 240312A: GECAM detection of a long burst
  35. GRB 240303C: VZLUSAT-2 detection
  36. Fermi trigger No 731839490: Global MASTER-Net observations report
  37. Fermi-LAT gamma-ray observations of IceCube-240307A
  38. GRB 240310B: Glowbug gamma-ray detection
  39. Fermi GRB 240310A: Global MASTER-Net observations report
  40. Swift GRB240309.61: Global MASTER-Net observations report
  41. GRB 240310A: Fermi GBM Final Real-time Localization
  42. IceCube-240307A: Upper limits from a search for additional neutrino events in IceCube
  43. GRID detection of GRB 240229A (Updated Report)
  44. GRID detection of GRB 240229A
  45. GRB 240308A: Fermi GBM Final Localization
  46. Fermi trigger No 731571927: Global MASTER-Net observations report
  47. GRB 240306A: Fermi GBM observation
  48. IceCube-240307A - IceCube observation of a high-energy neutrino candidate track-like event
  49. IceCube Alert 240307.32: Global MASTER-Net observations report
  50. GRB 240229A: GRBAlpha detection
  51. Konus-Wind detection of GRB 231118A
  52. GRB 240306A: AstroSat CZTI detection
  53. Fermi GRB 240306A: Global MASTER-Net observations report
  54. Fermi GRB 240305A: Global MASTER-Net observations report
  55. GRB 240306A: Swift/BAT-GUANO detection of a burst
  56. GRB 240305A: Fermi GBM observation
  57. Fermi-LAT gamma-ray observations of IceCube-240229A
  58. GRB 240306A: Fermi GBM Final Real-time Localization
  59. Swift GRB240305.18: Global MASTER-Net observations report
  60. Swift GRB240305.16: Global MASTER-Net observations report
  61. Fermi GRB 240305C: Global MASTER-Net observations report
  62. GRB 240305C: Fermi GBM Final Real-time Localization
  63. GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
  64. GRB 231028C: Glowbug gamma-ray confirmation of a prior burst
  65. GRB 240305B: Fermi GBM Final Localization
  66. Fermi trigger No 731303574: Global MASTER-Net observations report
  67. Konus-Wind detection of GRB 240227A (short/hard)
  68. GRB 240303B: VZLUSAT-2 detection
  69. GRB 240229A: VZLUSAT-2 detection
  70. IPN triangulation of GRB 240229A
  71. GRB 240305A: Fermi GBM Final Real-time Localization
  72. Konus-Wind detection of GRB 240303B
  73. IPN triangulation of GRB 240303B
  74. Swift J151857.0-572147: Swift-BAT refined analysis
  75. GRB 240303B: Fermi GBM Detection
  76. GRB 240225B: Swift-XRT afterglow detection
  77. GRB 240303B: CALET Gamma-Ray Burst Monitor detection
  78. Fermi trigger No 731161136: Global MASTER-Net observations report
  79. GRB 240303C: BALROG localization (Fermi Trigger 731189113 / GRB 240303837)
  80. Swift GRB 240303A: Global MASTER-Net observations report
  81. Swift J151857.0-572147: Confirmation of a new galactic transient
  82. GRB 240215A: Swift-XRT afterglow detection
  83. GRB 240303B: BALROG localization (Fermi Trigger 731161136 / GRB 240303513)
  84. GRB 240303B: Fermi GBM Final Localization
  85. IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
  86. GRB 240225C: Glowbug gamma-ray detection
  87. GRB 240225A (short): Glowbug gamma-ray detection
  88. GRB 240229A: CALET Gamma-Ray Burst Monitor detection
  89. IceCube-240229A - IceCube observation of a high-energy neutrino candidate track-like event
  90. Fermi GRB 240229A: Global MASTER-Net observations report
  91. IceCube Alert 240229.66: Global MASTER-Net observations report
  92. Konus-Wind detection of GRB 240225B (long)
  93. GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588)
  94. GRB 240229A: Fermi GBM Final Real-time Localization
  95. GRB 240225B: VLT/X-shooter redshift
  96. GRB 240225B : MITSuME Akeno optical afterglow candidate detection
  97. GRB 240225B: 3.6m DOT observation
  98. GRB 240226A: GRBAlpha detection
  99. Fermi GRB 240227A: Global MASTER-Net observations report
  100. GRB 240225B: Liverpool Telescope afterglow observations

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