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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"

11546 results found.

  1. GRB 190719C: Fermi GBM detection
  2. GRB 190720A: BALROG localization (Fermi Trigger 585326534 / GRB 190720613)
  3. GRB 190720A: Fermi GBM Final Real-time Localization
  4. LIGO/Virgo S190720a: Upper limits from Fermi-GBM Observations
  5. Fermi trigger No 585196946 Global MASTER-Net observations report
  6. GRB 190719C: NOT candidate optical afterglow and host
  7. GRB 190719C: Swift detection of a burst
  8. GRB 190719C: Fermi GBM Final Real-time Localization
  9. LIGO/Virgo S190718y: No counterpart candidates in Fermi-LAT observations
  10. GRB 190719A: Fermi GBM Final Real-time Localization
  11. LIGO/Virgo S190718y: Upper limits from Fermi-GBM Observations
  12. GRB 190613B: FRAM-Auger afterglow detection
  13. Fermi trigger No 585007213 Global MASTER-Net observations report
  14. GRB 190716A: BALROG localization (Fermi Trigger 585007213 / GRB 190716917)
  15. GRB 190716A: Fermi GBM Final Real-time Localization
  16. Fermi trigger No 584977168 Global MASTER-Net observations report
  17. Fermi trigger No 584929684 Global MASTER-Net observations report
  18. Fermi trigger No 584929684 Global MASTER-Net observations report
  19. Fermi trigger No 584804684 Global MASTER-Net observations report
  20. GRB 190714B: Fermi GBM Final Real-time Localization
  21. Fermi trigger No 584710308 Global MASTER-Net observations report
  22. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  23. Fermi trigger No 584637077 Global MASTER-Net observations report
  24. IceCube-190712A: Upper limits from Fermi-GBM Observations
  25. IceCube-190712A - IceCube observation of a high-energy neutrino candidate event
  26. Fermi trigger No 584590606 Global MASTER-Net observations report
  27. GRB 190712A: Fermi GBM Final Real-time Localization
  28. Fermi trigger No 584583925 Global MASTER-Net observations report
  29. Fermi trigger No 584465880 Global MASTER-Net observations report
  30. Fermi trigger No 584404689 Global MASTER-Net observations report
  31. IPN triangulation of GRB 190706D (short)
  32. IPN triangulation of GRB 190706C (long/very bright)
  33. Fermi trigger No 584264100 Global MASTER-Net observations report
  34. LIGO/Virgo S190707q: No counterpart candidates in Fermi-LAT observations
  35. GRB 190708A: Fermi GBM Final Real-time Localization
  36. LIGO/Virgo S190707q: Upper limits from Fermi-GBM Observations
  37. IPN triangulation of GRB 190704A (short)
  38. LIGO/Virgo S190706ai: No counterpart candidates in Fermi-LAT observations
  39. LIGO/Virgo S190701ah: No counterpart candidates in Fermi-LAT observations
  40. LIGO/Virgo S190706ai: Upper limits from Fermi-GBM Observations
  41. GRB 190707B: Fermi GBM Final Real-time Localization
  42. GRB 190707A: BALROG localization (Fermi Trigger 584175010 / GRB 190707285)
  43. GRB 190707A: Fermi GBM Final Real-time Localization
  44. Fermi trigger No 584007338 Global MASTER-Net observations report
  45. Fermi-LAT Gamma-ray Observations of IceCube-190704A and detection of the new gamma-ray source 1WHSP J104516.2+275133
  46. IceCube-190704A: not observable by Fermi-GBM
  47. IceCube-190704A - IceCube observation of a high-energy neutrino candidate event
  48. GRB 190530A: Observation of the afterglow by NOEMA
  49. Fermi trigger No 583854113 Global MASTER-Net observations report
  50. Fermi Gamma-ray Burst Monitor trigger 190626526/583245413 is not a GRB
  51. Fermi-LAT Gamma-ray Observations of IceCube-190629A
  52. IPN triangulation of GRB 190630A (short)
  53. LIGO/Virgo S190701ah: Upper limits from Fermi-GBM Observations
  54. LIGO/Virgo S190630ag: No counterpart candidates in Fermi-LAT observations
  55. LIGO/Virgo S190630ag: Upper limits from Fermi-GBM Observations
  56. IceCube-190629A: Upper limits from Fermi-GBM Observations
  57. Fermi trigger No 583567803 Global MASTER-Net observations report
  58. GRB 190630A: Fermi GBM Final Real-time Localization
  59. IceCube-190629A - IceCube observation of a high-energy neutrino candidate event
  60. GRB 190628A: Fermi GBM Final Real-time Localization
  61. Fermi trigger No 583327924 Global MASTER-Net observations report
  62. Fermi trigger No 583245413 Global MASTER-Net observations report
  63. Fermi trigger No 583245413 Global MASTER-Net observations report
  64. Fermi trigger No 583221986 Global MASTER-Net observations report
  65. GRB 190626B: Fermi GBM Final Real-time Localization
  66. GRB 190619B: AstroSat CZTI detection
  67. GRB 190626A: Fermi GBM Final Real-time Localization
  68. Fermi trigger No 583111521 Global MASTER-Net observations report
  69. GRB 190623A: Fermi GBM Final Real-time Localization
  70. Fermi trigger No 582886211 Global MASTER-Net observations report
  71. GRB 190622A: BALROG localization (Fermi Trigger 582886211 / GRB 190622368)
  72. GRB 190622A: Fermi GBM Final Real-time Localization
  73. Fermi trigger No 582856902 Global MASTER-Net observations report
  74. Fermi trigger No 582748289 Global MASTER-Net observations report
  75. Fermi trigger No 582759998 Global MASTER-Net observations report
  76. Fermi-LAT Gamma-ray Observations of IceCube-190619A
  77. GRB 190620A: BALROG localization (Fermi Trigger 582725415 / GRB 190620507)
  78. GRB 190620A: Fermi GBM Final Real-time Localization
  79. Fermi trigger No 582615488 Global MASTER-Net observations report
  80. Fermi trigger No 582615488 Global MASTER-Net observations report
  81. IceCube-190619A: not observable by Fermi-GBM
  82. Fermi GBM trigger 190619235/582615488 likely not a GRB
  83. IceCube-190619A - IceCube observation of a high-energy neutrino candidate event
  84. Fermi trigger No 582646590 Global MASTER-Net observations report
  85. GRB 190619B: BALROG localization (Fermi Trigger 582646590 / GRB 190619595)
  86. GRB 190619B: Fermi GBM Final Real-time Localization
  87. Fermi trigger No 582596766 Global MASTER-Net observations report
  88. GRB 190619A: Fermi GBM Final Real-time Localization
  89. GRB 190613B: AstroSat CZTI detection
  90. GRB 190611B: AstroSat CZTI detection
  91. Konus-Wind observation of GRB 190613B
  92. GRB 190615A: Insight-HXMT/HE detection
  93. Fermi trigger No 582304592 Global MASTER-Net observations report
  94. GRB 190615A: Fermi GBM Final Real-time Localization
  95. Fermi trigger No 582159815 Global MASTER-Net observations report
  96. GRB 190613B: GROND Detection of the Optical/NIR Afterglow
  97. GRB 190611B: CALET Gamma-Ray Burst Monitor detection
  98. GRB 190613B: Insight-HXMT/HE detection
  99. Konus-Wind observation of GRB 190611B
  100. Fermi trigger No 582115625 Global MASTER-Net observations report

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