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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"

11562 results found.

  1. GRB 240814C: Fermi GBM Final Real-time Localization
  2. Fermi GRB 240814B: Global MASTER-Net observations report
  3. GRB 240814B: Fermi GBM Final Real-time Localization
  4. GRB 240814A: Fermi GBM Final Real-time Localization
  5. Fermi trigger No 745220784: Global MASTER-Net observations report
  6. Konus-Wind detection of GRB 240810A
  7. Fermi Gamma-ray Burst Monitor trigger 745220784/240813240 is not a GRB
  8. GRB 240810A: SVOM/GRM observation
  9. Fermi Gamma-ray Burst Monitor trigger 240812940/745194848 is not a GRB
  10. Fermi Gamma-ray Burst Monitor trigger 240812917/745192855 is not a GRB
  11. Fermi Gamma-ray Burst Monitor trigger 240812917/745192855 is not a GRB
  12. GRB 240812D: Fermi GBM Final Real-time Localization
  13. GRB 240812C: Fermi GBM Final Real-time Localization
  14. IPN triangulation of GRB 240810A (short)
  15. Fermi Gamma-ray Burst Monitor trigger 745135620/240812255 is not a GRB
  16. Fermi GRB 240810A: Global MASTER-Net observations report
  17. Fermi Gamma-ray Burst Monitor trigger 240812094/745121685 is not a GRB
  18. GRB 240812A: Fermi GBM Final Real-time Localization
  19. Fermi trigger No 745057312: Global MASTER-Net observations report
  20. Fermi Gamma-ray Burst Monitor trigger 745050426/240811269 is not a GRB
  21. GRB 240810A: Fermi GBM Final Real-time Localization
  22. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  23. Fermi-LAT gamma-ray observations of IceCube-240808A
  24. IPN triangulation of GRB 240807A / EP 240807a
  25. GRB 240807A: SVOM/GRM observation
  26. EP240807a: STEP/T80S optical limits
  27. GRB 240807B: AstroSat CZTI detection of a short burst
  28. IceCube-240808A - IceCube observation of a high-energy neutrino candidate track-like event
  29. GRB 240801A: GRBAlpha detection
  30. GRB 240807B: Fermi GBM Final Localization
  31. GRB 240710B: VZLUSAT-2 detection
  32. GRB 240805A: ATCA Radio Upper Limits
  33. Fermi trigger No 744761058: Global MASTER-Net observations report
  34. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  35. GRB 240710A: VZLUSAT-2 detection
  36. GRB 240807A: Fermi GBM Final Localization
  37. Fermi trigger No 744629911: Global MASTER-Net observations report
  38. Konus-Wind detection of GRB 240805A
  39. GRB240805A: Fermi GBM Observation
  40. Fermi Gamma-ray Burst Monitor trigger 240806402/744629911 is not a GRB
  41. GRB 240624B: VZLUSAT-2 detection
  42. GRB 240619C: VZLUSAT-2 detection
  43. Fermi trigger No 744544656: Global MASTER-Net observations report
  44. GRB 240805A: SVOM/GRM observation
  45. Fermi GRB 240805A: Global MASTER-Net observations report
  46. Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
  47. GRB 240805A: Fermi-LAT detection
  48. GRB 240805A: INTEGRAL spectral analysis
  49. GRB 240805A: A long GRB detected by INTEGRAL
  50. GRB 240805A: Fermi GBM Final Real-time Localization
  51. Fermi GRB 240804A: Global MASTER-Net observations report
  52. GRB 240804A: Fermi GBM Final Real-time Localization
  53. Fermi trigger No 744459130: Global MASTER-Net observations report
  54. Fermi Gamma-ray Burst Monitor trigger 744459130/240804425 is not a GRB
  55. Fermi trigger No 744278264: Global MASTER-Net observations report
  56. GRB 240801B: AstroSat CZTI Updated classification - likely a solar flare
  57. Fermi GBM trigger 744179961 / 240801194 can not be confirmed as a GRB
  58. Fermi trigger No 744204856: Global MASTER-Net observations report
  59. GRB 240801B: AstroSat CZTI detection of a bright long burst
  60. Fermi GRB 240801A: Global MASTER-Net observations report
  61. GRB 240801A: Fermi GBM Final Real-time Localization
  62. GRB 240731A: Fermi GBM Final Localization
  63. Fermi trigger No 744128417: Global MASTER-Net observations report
  64. Fermi trigger No 744083370: Global MASTER-Net observations report
  65. GRB 240731A: AstroSat CZTI detection
  66. Fermi Gamma-ray Burst Monitor trigger 744061103/240730818 is not a GRB
  67. Fermi GRB 240730B: Global MASTER-Net observations report
  68. GRB 240730B: Fermi GBM Final Real-time Localization
  69. Fermi trigger No 743953682: Global MASTER-Net observations report
  70. Fermi Gamma-ray Burst Monitor trigger 743953682/240729575 is not a GRB
  71. GRB 240727B: Swift-XRT observations
  72. Fermi GRB 240727A: Global MASTER-Net observations report
  73. Fermi trigger No 743868421: Global MASTER-Net observations report
  74. Fermi Gamma-ray Burst Monitor trigger 743868421/240728588 is not a GRB
  75. GRB 240727D: Correction to the GRB name in GCN 36958
  76. GRB 240727A: Fermi GBM Final Real-time Localization
  77. GRB 240718A: GRBAlpha detection
  78. GRB 240710B: GRBAlpha detection
  79. Fermi GRB 240726A: Global MASTER-Net observations report
  80. GRB 240727B: Fermi GBM Observation
  81. GRB 240727B: Swift ToO observations
  82. GRB 240727B: Swift/BAT-GUANO arcminute localization of a long burst
  83. GRB 240726A: SVOM/GRM observation
  84. GRB 240727B: AstroSat CZTI detection
  85. GRB 240726A: AstroSat CZTI detection of a short burst
  86. GRB 240726A: Fermi GBM Final Real-time Localization
  87. Fermi-LAT gamma-ray observations of IceCube-240725A
  88. IceCube-240725A - IceCube observation of a high-energy neutrino candidate track-like event
  89. Fermi trigger No 743418632: Global MASTER-Net observations report
  90. Fermi trigger No 743315411: Global MASTER-Net observations report
  91. Fermi trigger No 743345551: Global MASTER-Net observations report
  92. Fermi-LAT gamma-ray observations of IceCube-240721A
  93. Fermi Gamma-ray Burst Monitor trigger 743271526/240721680 is not a GRB
  94. Fermi trigger No 743219692: Global MASTER-Net observations report
  95. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  96. Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
  97. GRB 240721A: Fermi GBM Final Real-time Localization
  98. Fermi GRB 240720A: Global MASTER-Net observations report
  99. GRB 240720A: AstroSat CZTI detection
  100. GRB 240720A: Fermi GBM observation

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