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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"

45798 results found.

  1. Swift Trigger 1219905 is not a GRB
  2. GRB 240312A: GECAM detection of a long burst
  3. Swift Trigger 1219874 is not astrophysical
  4. GRB 240303C: VZLUSAT-2 detection
  5. GRB 240310A: MASTER OT J200702.72-263928.7 inside 3sigma
  6. Fermi trigger No 731839490: Global MASTER-Net observations report
  7. Fermi-LAT gamma-ray observations of IceCube-240307A
  8. GRB 240310B: Glowbug gamma-ray detection
  9. Fermi GRB 240310A: Global MASTER-Net observations report
  10. Swift GRB240309.61: Global MASTER-Net observations report
  11. GRB 240310A: Fermi GBM Final Real-time Localization
  12. GRB 240309A: MAXI/GSC detection
  13. Swift Trigger 1219325 is not a GRB
  14. IceCube-240307A: Upper limits from a search for additional neutrino events in IceCube
  15. GRID detection of GRB 240229A (Updated Report)
  16. GRID detection of GRB 240229A
  17. GRB 240308A: Fermi GBM Final Localization
  18. Fermi trigger No 731571927: Global MASTER-Net observations report
  19. GRB 231215A: further radio observations with the VLA
  20. GRB 240306A: Fermi GBM observation
  21. IceCube-240307A - IceCube observation of a high-energy neutrino candidate track-like event
  22. GRB 240229A: Glowbug gamma-ray detection
  23. GRB 240227A (short): Glowbug gamma-ray detection
  24. IceCube Alert 240307.32: Global MASTER-Net observations report
  25. GRB 240229A: GRBAlpha detection
  26. Konus-Wind detection of GRB 231118A
  27. GRB 240306A: AstroSat CZTI detection
  28. Fermi GRB 240306A: Global MASTER-Net observations report
  29. Fermi GRB 240305A: Global MASTER-Net observations report
  30. GRB 240306A: Swift/BAT-GUANO detection of a burst
  31. GRB 240305A: Fermi GBM observation
  32. Fermi-LAT gamma-ray observations of IceCube-240229A
  33. GRB 240305C: AstroSat CZTI detection of a short burst
  34. GRB 240306A: Fermi GBM Final Real-time Localization
  35. Swift GRB240305.18: Global MASTER-Net observations report
  36. Swift GRB240305.16: Global MASTER-Net observations report
  37. Fermi GRB 240305C: Global MASTER-Net observations report
  38. GRB 240305C: Fermi GBM Final Real-time Localization
  39. GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
  40. GRB 231028C: Glowbug gamma-ray confirmation of a prior burst
  41. GRB 240218A: ALMA detection
  42. GRB 240218A: Chandra Detection and Jet Break Confirmation
  43. GRB 240305B: Fermi GBM Final Localization
  44. Fermi trigger No 731303574: Global MASTER-Net observations report
  45. Konus-Wind detection of GRB 240227A (short/hard)
  46. GRB 240303B: VZLUSAT-2 detection
  47. GRB 240229A: VZLUSAT-2 detection
  48. Improved IPN triangulation of GRB 240227A (short)
  49. IPN triangulation of GRB 240229A
  50. GRB 240305A: Fermi GBM Final Real-time Localization
  51. Swift Trigger 1218701: Yes, we triggered on Swift J151857.0-572147 again
  52. Swift Trigger 1218696: Another trigger on Swift J151857.0-572147
  53. GRB240218A: ATCA observation of the radio counterpart
  54. Transient EPW20240219aa: Optical observations with LDT
  55. Konus-Wind detection of GRB 240303B
  56. Swift Trigger 1218645: Another detection of Swift J151857.0-572147
  57. IPN triangulation of GRB 240303B
  58. Swift J151857.0-572147: Swift-BAT refined analysis
  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. IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
  73. GRB 240225C: Glowbug gamma-ray detection
  74. GRB 240225A (short): Glowbug gamma-ray detection
  75. GRB 240229A: DDOTI Upper Limits on the Afterglow
  76. GRB 240218A: NOEMA upper limit
  77. GRB 240229A: CALET Gamma-Ray Burst Monitor detection
  78. IceCube-240229A - IceCube observation of a high-energy neutrino candidate track-like event
  79. Swift BAT Triggers 1218081 and 1218082 are not astrophysical
  80. GRB 240225B: further SAO RAS optical observations
  81. Fermi GRB 240229A: Global MASTER-Net observations report
  82. IceCube Alert 240229.66: Global MASTER-Net observations report
  83. GRB 240225B: Swift ToO observations
  84. Konus-Wind detection of GRB 240225B (long)
  85. GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588)
  86. GRB 240229A: Fermi GBM Final Real-time Localization
  87. GRB 240225B: VLT/X-shooter redshift
  88. GRB 240225B : MITSuME Akeno optical afterglow candidate detection
  89. GRB 240225B: 3.6m DOT observation
  90. GRB 240225B: WINTER near-IR observations and upper limits
  91. GRB 240225B: SAO RAS optical observations
  92. GRB 240226A: GRBAlpha detection
  93. GRB 240225B: Mondy afterglow observations
  94. Fermi GRB 240227A: Global MASTER-Net observations report
  95. GRB 240225B: Liverpool Telescope afterglow observations
  96. Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up
  97. Swift Trigger 1217799 is not a GRB
  98. IPN triangulation of GRB 240227A (short)
  99. GRB 240225B: Liverpool Telescope optical afterglow observations
  100. GRB 240225B: NOT optical observations

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