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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"

11519 results found.

  1. Fermi trigger No 584583925 Global MASTER-Net observations report
  2. Fermi trigger No 584465880 Global MASTER-Net observations report
  3. Fermi trigger No 584404689 Global MASTER-Net observations report
  4. IPN triangulation of GRB 190706D (short)
  5. IPN triangulation of GRB 190706C (long/very bright)
  6. Fermi trigger No 584264100 Global MASTER-Net observations report
  7. LIGO/Virgo S190707q: No counterpart candidates in Fermi-LAT observations
  8. GRB 190708A: Fermi GBM Final Real-time Localization
  9. LIGO/Virgo S190707q: Upper limits from Fermi-GBM Observations
  10. IPN triangulation of GRB 190704A (short)
  11. LIGO/Virgo S190706ai: No counterpart candidates in Fermi-LAT observations
  12. LIGO/Virgo S190701ah: No counterpart candidates in Fermi-LAT observations
  13. LIGO/Virgo S190706ai: Upper limits from Fermi-GBM Observations
  14. GRB 190707B: Fermi GBM Final Real-time Localization
  15. GRB 190707A: BALROG localization (Fermi Trigger 584175010 / GRB 190707285)
  16. GRB 190707A: Fermi GBM Final Real-time Localization
  17. Fermi trigger No 584007338 Global MASTER-Net observations report
  18. Fermi-LAT Gamma-ray Observations of IceCube-190704A and detection of the new gamma-ray source 1WHSP J104516.2+275133
  19. IceCube-190704A: not observable by Fermi-GBM
  20. IceCube-190704A - IceCube observation of a high-energy neutrino candidate event
  21. GRB 190530A: Observation of the afterglow by NOEMA
  22. Fermi trigger No 583854113 Global MASTER-Net observations report
  23. Fermi Gamma-ray Burst Monitor trigger 190626526/583245413 is not a GRB
  24. Fermi-LAT Gamma-ray Observations of IceCube-190629A
  25. IPN triangulation of GRB 190630A (short)
  26. LIGO/Virgo S190701ah: Upper limits from Fermi-GBM Observations
  27. LIGO/Virgo S190630ag: No counterpart candidates in Fermi-LAT observations
  28. LIGO/Virgo S190630ag: Upper limits from Fermi-GBM Observations
  29. IceCube-190629A: Upper limits from Fermi-GBM Observations
  30. Fermi trigger No 583567803 Global MASTER-Net observations report
  31. GRB 190630A: Fermi GBM Final Real-time Localization
  32. IceCube-190629A - IceCube observation of a high-energy neutrino candidate event
  33. GRB 190628A: Fermi GBM Final Real-time Localization
  34. Fermi trigger No 583327924 Global MASTER-Net observations report
  35. Fermi trigger No 583245413 Global MASTER-Net observations report
  36. Fermi trigger No 583245413 Global MASTER-Net observations report
  37. Fermi trigger No 583221986 Global MASTER-Net observations report
  38. GRB 190626B: Fermi GBM Final Real-time Localization
  39. GRB 190619B: AstroSat CZTI detection
  40. GRB 190626A: Fermi GBM Final Real-time Localization
  41. Fermi trigger No 583111521 Global MASTER-Net observations report
  42. GRB 190623A: Fermi GBM Final Real-time Localization
  43. Fermi trigger No 582886211 Global MASTER-Net observations report
  44. GRB 190622A: BALROG localization (Fermi Trigger 582886211 / GRB 190622368)
  45. GRB 190622A: Fermi GBM Final Real-time Localization
  46. Fermi trigger No 582856902 Global MASTER-Net observations report
  47. Fermi trigger No 582748289 Global MASTER-Net observations report
  48. Fermi trigger No 582759998 Global MASTER-Net observations report
  49. Fermi-LAT Gamma-ray Observations of IceCube-190619A
  50. GRB 190620A: BALROG localization (Fermi Trigger 582725415 / GRB 190620507)
  51. GRB 190620A: Fermi GBM Final Real-time Localization
  52. Fermi trigger No 582615488 Global MASTER-Net observations report
  53. Fermi trigger No 582615488 Global MASTER-Net observations report
  54. IceCube-190619A: not observable by Fermi-GBM
  55. Fermi GBM trigger 190619235/582615488 likely not a GRB
  56. IceCube-190619A - IceCube observation of a high-energy neutrino candidate event
  57. Fermi trigger No 582646590 Global MASTER-Net observations report
  58. GRB 190619B: BALROG localization (Fermi Trigger 582646590 / GRB 190619595)
  59. GRB 190619B: Fermi GBM Final Real-time Localization
  60. Fermi trigger No 582596766 Global MASTER-Net observations report
  61. GRB 190619A: Fermi GBM Final Real-time Localization
  62. GRB 190613B: AstroSat CZTI detection
  63. GRB 190611B: AstroSat CZTI detection
  64. Konus-Wind observation of GRB 190613B
  65. GRB 190615A: Insight-HXMT/HE detection
  66. Fermi trigger No 582304592 Global MASTER-Net observations report
  67. GRB 190615A: Fermi GBM Final Real-time Localization
  68. Fermi trigger No 582159815 Global MASTER-Net observations report
  69. GRB 190613B: GROND Detection of the Optical/NIR Afterglow
  70. GRB 190611B: CALET Gamma-Ray Burst Monitor detection
  71. GRB 190613B: Insight-HXMT/HE detection
  72. Konus-Wind observation of GRB 190611B
  73. Fermi trigger No 582115625 Global MASTER-Net observations report
  74. GRB 190613A: Fermi GBM detection
  75. GRB 190613B: Fermi GBM observation
  76. GRB 190611B: BALROG localization (Fermi Trigger 581986074 / GRB 190611950)
  77. IPN Triangulation of GRB 190611B
  78. GRB 190613B: BALROG localization (Fermi Trigger 582115625 / GRB 190613449)
  79. GRB 190613B: Fermi GBM Final Real-time Localization
  80. GRB 190609A: AstroSat CZTI detection
  81. GRB 190613A: MASTER OT detection
  82. GRB 190613A: BALROG localization (Fermi Trigger 582091643 / GRB 190613172)
  83. GRB 190613A: Fermi GBM Final Real-time Localization
  84. Fermi trigger No 582091643 Global MASTER-Net observations report
  85. Fermi trigger No 582012834 Global MASTER-Net observations report
  86. Fermi trigger No 581986074 Global MASTER-Net observations report
  87. GRB 190611B: Fermi GBM detection
  88. GRB 190610B: AstroSat CZTI detection
  89. Fermi trigger No 582004649 Global MASTER-Net observations report
  90. GRB 190612A: Fermi GBM Final Real-time Localization
  91. Konus-Wind observation of GRB 190606A
  92. Fermi trigger No 581889628 Global MASTER-Net observations report
  93. GRB 190610C: Fermi GBM Final Real-time Localization
  94. Fermi trigger No 581882394 Global MASTER-Net observations report
  95. GRB190610B: BALROG localization (Fermi Trigger 581882394 / GRB 190610750)
  96. GRB 190610B: Fermi GBM Final Real-time Localization
  97. Fermi trigger No 581841498 Global MASTER-Net observations report
  98. GRB190609A: BALROG localization (Fermi Trigger 581758450 / GRB 190609315)
  99. GRB 190609A: Fermi GBM Final Real-time Localization
  100. Fermi trigger No 581719018 Global MASTER-Net observations report

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