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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11059 results found.

  1. GRB 240616A: Fermi GBM Final Real-time Localization
  2. GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
  3. GRB 240615A: Fermi GBM Final Real-time Localization
  4. GRB 240603A: VZLUSAT-2 detection
  5. GRB 240612A: GRBAlpha detection
  6. GRB 240613A: Fermi GBM Final Real-time Localization
  7. Fermi GRB 240612B: Global MASTER-Net observations report
  8. Fermi GRB 240612A: Global MASTER-Net observations report
  9. GRB 240612B: Fermi GBM Final Real-time Localization
  10. GRB 240612A: Fermi GBM Final Real-time Localization
  11. GRB 240607A: GECAM detection of a bright long burst
  12. Fermi GRB 240611A: Global MASTER-Net observations report
  13. Konus-Wind detection of GRB 240607A
  14. GRB 240611A: Fermi GBM Final Real-time Localization
  15. Fermi GRB 240610A: Global MASTER-Net observations report
  16. GRB 240610A: Fermi GBM Final Real-time Localization
  17. IPN triangulation of GRB 240607A
  18. Fermi Gamma-ray Burst Monitor trigger 739632045/240609556 is not a GRB
  19. Fermi trigger No 739632045: Global MASTER-Net observations report
  20. Fermi GRB 240608A: Global MASTER-Net observations report
  21. Konus-Wind detection of GRB 240606B
  22. Fermi trigger No 739506569: Global MASTER-Net observations report
  23. GRB 240608A: Fermi GBM Final Real-time Localization
  24. Fermi GRB 240607A: Global MASTER-Net observations report
  25. GRB 240607A: Fermi GBM Observation
  26. GRB 240606B: Fermi GBM Observation
  27. GRB 240607A: AstroSat CZTI detection of bright long burst
  28. GRB 240607A: Fermi GBM detection of a very bright burst
  29. GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
  30. GRB 240607A: Fermi GBM Final Real-time Localization
  31. Fermi trigger No 739373591: Global MASTER-Net observations report
  32. Konus-Wind detection of GRB 240603A
  33. Fermi GRB 240604A: Global MASTER-Net observations report
  34. Fermi GRB 240605A: Global MASTER-Net observations report
  35. Fermi GRB 240605C: Global MASTER-Net observations report
  36. Fermi Gamma-ray Burst Monitor trigger 739290883/240605607 is not a GRB
  37. GRB 240605C: Fermi GBM Final Real-time Localization
  38. IPN triangulation of GRB 240603A
  39. GRB 240605B: Fermi GBM Final Real-time Localization
  40. GRB 240604A: Fermi GBM Final Localization
  41. GRB 240605A: Fermi GBM Final Real-time Localization
  42. Fermi GRB 240603C: Global MASTER-Net observations report
  43. GRB 240603A: Fermi GBM Final Localization
  44. GRB 240603C: BALROG localization (Fermi Trigger 739102156 / GRB 240603423)
  45. GRB 240603C: Fermi GBM Final Real-time Localization
  46. Fermi GRB 240602A: Global MASTER-Net observations report
  47. GRB 240602A: Fermi GBM Final Real-time Localization
  48. GRB 240527B: Swift-XRT afterglow detection
  49. GRB 240527B: Fermi GBM Observation
  50. Fermi GRB 240527A: Global MASTER-Net observations report
  51. GRB 240527B: Fermi-LAT detection
  52. Fermi GRB 240527B: Global MASTER-Net observations report
  53. GRB 240527B: Fermi GBM Final Localization
  54. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  55. GRB 240527A: Fermi GBM Final Real-time Localization
  56. Fermi trigger No 738348224: Global MASTER-Net observations report
  57. Fermi trigger No 738330463: Global MASTER-Net observations report
  58. GRB 240521B: Fermi GBM Observation
  59. Fermi GBM Sub-Threshold Detection of GRB 240516B
  60. GRB 240513A: Swift-XRT afterglow detection
  61. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  62. Fermi trigger No 737996942: Global MASTER-Net observations report
  63. GRB 240516B: AstroSat CZTI detection
  64. GRB 240514B: VZLUSAT-2 detection
  65. GRB 240504A: VZLUSAT-2 detection
  66. GRB 240502A: VZLUSAT-2 detection
  67. GRB 240519A: GRBAlpha detection
  68. GRB 240519A: AstroSat CZTI detection
  69. Fermi trigger No 737788024: Global MASTER-Net observations report
  70. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  71. Fermi GRB 240517A: Global MASTER-Net observations report
  72. GRB 240516A ATCA radio observations
  73. IPN triangulation of GRB 240514B (short)
  74. GRB 240513A: Swift ToO observations
  75. GRB 240517A: Fermi GBM Final Real-time Localization
  76. Konus-Wind detection of GRB 240513A
  77. GRB 240516A: AstroSat CZTI detection
  78. Fermi trigger No 737559855: Global MASTER-Net observations report
  79. GRB 240516A: Fermi GBM Observation
  80. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  81. GRB 240516A: GOTO optical upper limit
  82. Fermi trigger No 737523389: Global MASTER-Net observations report
  83. GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
  84. Fermi trigger No 737476171: Global MASTER-Net observations report
  85. GRB 240514B: GOTO candidate optical counterpart
  86. Fermi Gamma-ray Burst Monitor list of triggers that are not a GRB
  87. GRB 240514B: GRBAlpha detection
  88. GRB 240514B: Fermi GBM Detection
  89. GRB 240513A: Fermi GBM observation
  90. GRB 240513A: Swift-XRT observations
  91. GRB 240514C: Fermi GBM Final Real-time Localization
  92. Fermi GRB 240514B: Global MASTER-Net observations report
  93. Fermi Gamma-ray Burst Monitor triggers 737345659/240514093 and GRB240514A are not GRBs
  94. GRB 240514B: Fermi GBM Final Real-time Localization
  95. GRB 240514A: Fermi GBM Final Real-time Localization
  96. GRB 240513A: Tiled Swift observations
  97. GRB 240513A: Fermi-LAT detection
  98. GRB 240511A: Fermi GBM Observation
  99. Fermi GRB 240513B: Global MASTER-Net observations report
  100. Fermi trigger No 737277727: Global MASTER-Net observations report

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