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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"

28225 results found.

  1. GRB 240812B: SVOM/GRM observation
  2. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  3. GRB 240814B: Fermi GBM Final Real-time Localization
  4. GRB 240814A: Fermi GBM Final Real-time Localization
  5. Konus-Wind detection of GRB 240811A
  6. Konus-Wind detection of GRB 240810A
  7. GRB 240809A: ATA radio non-detection
  8. GRB 240812D: Fermi GBM Final Real-time Localization
  9. GRB 240812C: Fermi GBM Final Real-time Localization
  10. GRB 240809A : RAPAS follow-up observations
  11. GRB 240809A: VLA detection
  12. GRB 240809A: ALMA detection
  13. IPN triangulation of GRB 240810A (short)
  14. EP240807a: PRIME H-band upper limits
  15. GRB 240812B: AstroSat CZTI detection of a long burst
  16. GRB 240811A: Swift-XRT refined Analysis
  17. GRB 240811A: Swift/UVOT Upper Limits
  18. GRB 240812A: Fermi GBM Final Real-time Localization
  19. GRB 240811A: LCOGT Optical Upper Limit
  20. GRB 240811A: Enhanced Swift-XRT position
  21. Konus-Wind detection of GRB 240809A
  22. GRB 240811A: Swift detection of a burst
  23. GRB240809A: Liverpool Telescope optical follow-up observations
  24. GRB 240810A: Fermi GBM Final Real-time Localization
  25. GRB 240809A: REM detection of the optical afterglow
  26. GRB 240809A: Bassano Bresciano Observatory optical observations
  27. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  28. GRB 240809A: Conclusive redshift from VLT
  29. GRB 240809A: KAIT optical observations
  30. GRB 240808A: AstroSat CZTI detection
  31. GRB 240809A: GIT afterglow observations
  32. GRB 240809B: MAXI/GSC detection
  33. GRB 240809A: Swift/UVOT Detection
  34. GRB 240809A: Tentative redshift from NOT
  35. GRB 240809A: Swift-XRT refined Analysis
  36. IPN triangulation of GRB 240807A / EP 240807a
  37. X-ray Transient EP240807a: PRIME near-infrared upper limits
  38. GRB 240809A: JinShan optical observations
  39. GRB 240809A: Enhanced Swift-XRT position
  40. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  41. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  42. GRB 240807B: AstroSat CZTI detection of a short burst
  43. IceCube-240808A - IceCube observation of a high-energy neutrino candidate track-like event
  44. GRB 240801A: GRBAlpha detection
  45. GRB 240807B: Fermi GBM Final Localization
  46. GRB 240710B: VZLUSAT-2 detection
  47. GRB 240805A: ATCA Radio Upper Limits
  48. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  49. GRB 240720B: VZLUSAT-2 detection
  50. GRB 240710A: VZLUSAT-2 detection
  51. EP240806A: Liverpool Telescope optical follow-up observations
  52. The EP-WXT trigger 01709018832 on August 7th is likely a flaring star
  53. GRB 240807A: Fermi GBM Final Localization
  54. EP240807a: EP-WXT detection of a fast X-ray transient
  55. EP240806a: Gemini North-GMOS spectroscopic redshift of z = 2.818
  56. GRB 240805B: GIT optical upper limit
  57. EP240806a: LCOGT optical counterpart detection
  58. Konus-Wind detection of GRB 240802A (EP240802a)
  59. Konus-Wind detection of GRB 240805A
  60. GRB 240805B: JinShan optical afterglow detection
  61. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  62. EP240806a: EP-FXT detection of the X-ray emission
  63. GRB 240626B: VZLUSAT-2 detection
  64. GRB 240624B: VZLUSAT-2 detection
  65. GRB 240619C: VZLUSAT-2 detection
  66. EP240806a: GSP optical counterpart detection
  67. EP240806a: EP-WXT detection of a fast X-ray transient
  68. GRB 240805B: Optical detection with 1.6m Mephisto
  69. EP240804a: BOOTES-6/DPRT optical detection
  70. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  71. GRB 240805B: Swift-XRT refined Analysis
  72. GRB 240805B: Swift/UVOT Upper Limits
  73. GRB 240805A: Swift/UVOT Upper Limits
  74. GRB 240805B: BTA optical afterglow candidate
  75. GRB 240805B: Enhanced Swift-XRT position
  76. GRB 240805B: LCOGT Optical Upper Limits
  77. GRB 240805B: JinShan optical upper limits
  78. GRB 240805A: Swift-XRT refined Analysis
  79. GRB 240805B: Swift detection of a burst
  80. GRB 240805A: Fermi-LAT detection
  81. EP240804a: LCOGT optical counterpart detection
  82. EP240804a: NOT optical counterpart detection
  83. EP240804a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  84. GRB 240805A: Swift detection of a burst
  85. GRB 240805A: Fermi GBM Final Real-time Localization
  86. GRB 240804A: Fermi GBM Final Real-time Localization
  87. IPN triangulation of GRB 240802A / EP 240802a
  88. EP240802a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  89. GRB 240802A: AstroSat CZTI detection of a long burst
  90. EP240801a: GRANDMA and Kilonova-Catcher optical observations
  91. EP240801a: GSP follow-up observations of the candidate counterpart
  92. EP240801a: TRT optical counterpart detection
  93. EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  94. GRB 240801B: AstroSat CZTI detection of a bright long burst
  95. GRB 240801A: Fermi GBM Final Real-time Localization
  96. GRB 240730C: AstroSat CZTI detection of a long burst
  97. GRB 240731A: Fermi GBM Final Localization
  98. GRB 240731A: AstroSat CZTI detection
  99. GRB240730A: BOOTES-5/JGT early optical upper limit
  100. GRB 240730B: Fermi GBM Final Real-time Localization

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