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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"

11552 results found.

  1. Konus-Wind detection of GRB 220826A
  2. GRB 220827A: Fermi GBM Final Real-time Localization
  3. GRB 220826A: Fermi GBM observation
  4. Fermi trigger No 683202084: Global MASTER-Net observations report
  5. Fermi trigger No 683183601: Global MASTER-Net observations report
  6. Fermi trigger No 683152759: Global MASTER-Net observations report
  7. GRB 220825A: Fermi GBM observation
  8. GRB 220825A: Swift/BAT-GUANO detection
  9. GRB 220825A: Fermi GBM Final Localization
  10. GRB 220823A: Fermi GBM detection
  11. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  12. Fermi trigger No 682918137: Global MASTER-Net observations report
  13. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  14. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  15. GRB 220821A: Fermi GBM Final Real-time Localization
  16. GRB 220810A: Further Swift-XRT observations
  17. GRB 220810A: Swift-XRT observations
  18. Fermi trigger No 681998863: Global MASTER-Net observations report
  19. GRB 220810A: Swift ToO observations
  20. GRB 220810A: MeerLICHT detection of two afterglow candidates
  21. Fermi GBM trigger 681998863/220812505 is not a GRB
  22. Fermi trigger No 681890304: Global MASTER-Net observations report
  23. Fermi GBM trigger 681890304/220811249 is not a GRB
  24. Fermi GRB 220810A: Global MASTER-Net observations report
  25. GRB 220810A: Fermi GBM Final Real-time Localization
  26. GRB 220627A: MeerKAT radio observations
  27. Fermi trigger No 681719116: Global MASTER-Net observations report
  28. Fermi GBM trigger 681719116/220809267 is not a GRB
  29. Fermi trigger No 681633544: Global MASTER-Net observations report
  30. Fermi GBM trigger 681633544/220808277 is not a GRB
  31. Fermi GBM trigger 681547990 / 220807287 is not a GRB
  32. GRB 220804A: Fermi GBM Final Localization
  33. Fermi trigger No 681271717: Global MASTER-Net observations report
  34. GRB 220803A: AstroSat CZTI detection
  35. Fermi trigger No 681212354: Global MASTER-Net observations report
  36. Konus-Wind detection of GRB 220730A (short)
  37. GRB 220730A: Fermi GBM detection
  38. GRB 220729A: AstroSat CZTI detection
  39. Fermi trigger No 680782656: Global MASTER-Net observations report
  40. Fermi GRB 220728A: Global MASTER-Net observations report
  41. GRB 220728A: Fermi GBM Final Real-time Localization
  42. GRB 220726A: Fermi GBM Final Real-time Localization
  43. Fermi trigger No 680421061: Global MASTER-Net observations report
  44. Fermi GRB 220724A: Global MASTER-Net observations report
  45. GRB 220724A: Fermi GBM Final Real-time Localization
  46. GRB 220715B: VIRT Optical Upper Limit
  47. Fermi GRB 220721A: Global MASTER-Net observations report
  48. GRB 220721A: Fermi GBM Final Real-time Localization
  49. Retraction: Fermi GBM trigger 679932336.585264/220719587 is not a GRB
  50. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  51. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  52. GRB 220719A: Fermi GBM Final Real-time Localization
  53. GRB 220715B: Fermi GBM detection
  54. GRB 220715B: BOOTES-network optical upper limits
  55. GRB 220715B: Fermi GBM Final Real-time Localization
  56. GRB 220714B: Fermi GBM observation
  57. GRB 220715A: AGILE/MCAL detection
  58. GRB 220715A: Fermi GBM Final Real-time Localization
  59. GRB 220713A: Fermi GBM Final Localization
  60. GRB 220714B: Fermi GBM Final Real-time Localization
  61. GRB 220711C: Fermi GBM Observation
  62. GRB 220711B: 10.4 m GTC(+EMIR) observations
  63. GRB 220711B: 10.4 m GTC(+EMIR) observations
  64. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  65. GRB 220711B: GIT optical upper limits
  66. Fermi trigger No 679248723: Global MASTER-Net observations report
  67. Fermi GRB 220711B: Global MASTER-Net observations report
  68. IPN triangulation of GRB 220711C (short)
  69. GRB 220711B: Fermi GBM Detection
  70. GRB 220711B: LCO Optical Upper Limits
  71. GRB 220711B: Fermi GBM Final Real-time Localization
  72. GRB 220708B: GIT optical upper limits
  73. GRB 220711A: Fermi GBM Final Real-time Localization
  74. GRB 220627A: ATCA detection of radio counterpart
  75. GRB 220702B: AstroSat CZTI detection
  76. GRB 220702B: Fermi GBM Final Localization
  77. GRB 220702A: Fermi GBM Final Localization
  78. GRB 220705A: Fermi GBM Final Localization
  79. Fermi trigger No 678635286: Global MASTER-Net observations report
  80. GRB 220627A: AstroSat CZTI detection
  81. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  82. GRB 220627A, GROND observations
  83. GRB 220624A: AGILE/GRID refined analysis
  84. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  85. IceCube-220629A - IceCube observation of a high-energy neutrino candidate track-like event
  86. GRB 220627A: Swift-XRT afterglow detection
  87. Konus-Wind detection of GRB 220627A
  88. GRB 220627A: VLT MUSE redshift
  89. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  90. GRB 220627A: MeerLICHT candidate optical afterglow
  91. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  92. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  93. Konus-Wind detection of GRB 220624A
  94. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  95. GRB 220627A: Swift ToO observations
  96. GRB 220627A: Fermi-LAT detection
  97. Fermi trigger No 678058621: Global MASTER-Net observations report
  98. GRB 220627A: MeerLICHT detection of two afterglow candidates
  99. Fermi GRB 220627A: Global MASTER-Net observations report
  100. GRB 220627A: Fermi GBM Final Real-time Localization

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