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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"

11102 results found.

  1. Fermi-LAT Gamma-ray Observations of IceCube-190704A and detection of the new gamma-ray source 1WHSP J104516.2+275133
  2. IceCube-190704A: not observable by Fermi-GBM
  3. IceCube-190704A - IceCube observation of a high-energy neutrino candidate event
  4. GRB 190530A: Observation of the afterglow by NOEMA
  5. Fermi trigger No 583854113 Global MASTER-Net observations report
  6. Fermi Gamma-ray Burst Monitor trigger 190626526/583245413 is not a GRB
  7. Fermi-LAT Gamma-ray Observations of IceCube-190629A
  8. IPN triangulation of GRB 190630A (short)
  9. LIGO/Virgo S190701ah: Upper limits from Fermi-GBM Observations
  10. LIGO/Virgo S190630ag: No counterpart candidates in Fermi-LAT observations
  11. LIGO/Virgo S190630ag: Upper limits from Fermi-GBM Observations
  12. IceCube-190629A: Upper limits from Fermi-GBM Observations
  13. Fermi trigger No 583567803 Global MASTER-Net observations report
  14. GRB 190630A: Fermi GBM Final Real-time Localization
  15. IceCube-190629A - IceCube observation of a high-energy neutrino candidate event
  16. GRB 190628A: Fermi GBM Final Real-time Localization
  17. Fermi trigger No 583327924 Global MASTER-Net observations report
  18. Fermi trigger No 583245413 Global MASTER-Net observations report
  19. Fermi trigger No 583245413 Global MASTER-Net observations report
  20. Fermi trigger No 583221986 Global MASTER-Net observations report
  21. GRB 190626B: Fermi GBM Final Real-time Localization
  22. GRB 190619B: AstroSat CZTI detection
  23. GRB 190626A: Fermi GBM Final Real-time Localization
  24. Fermi trigger No 583111521 Global MASTER-Net observations report
  25. GRB 190623A: Fermi GBM Final Real-time Localization
  26. Fermi trigger No 582886211 Global MASTER-Net observations report
  27. GRB 190622A: BALROG localization (Fermi Trigger 582886211 / GRB 190622368)
  28. GRB 190622A: Fermi GBM Final Real-time Localization
  29. Fermi trigger No 582856902 Global MASTER-Net observations report
  30. Fermi trigger No 582748289 Global MASTER-Net observations report
  31. Fermi trigger No 582759998 Global MASTER-Net observations report
  32. Fermi-LAT Gamma-ray Observations of IceCube-190619A
  33. GRB 190620A: BALROG localization (Fermi Trigger 582725415 / GRB 190620507)
  34. GRB 190620A: Fermi GBM Final Real-time Localization
  35. Fermi trigger No 582615488 Global MASTER-Net observations report
  36. Fermi trigger No 582615488 Global MASTER-Net observations report
  37. IceCube-190619A: not observable by Fermi-GBM
  38. Fermi GBM trigger 190619235/582615488 likely not a GRB
  39. IceCube-190619A - IceCube observation of a high-energy neutrino candidate event
  40. Fermi trigger No 582646590 Global MASTER-Net observations report
  41. GRB 190619B: BALROG localization (Fermi Trigger 582646590 / GRB 190619595)
  42. GRB 190619B: Fermi GBM Final Real-time Localization
  43. Fermi trigger No 582596766 Global MASTER-Net observations report
  44. GRB 190619A: Fermi GBM Final Real-time Localization
  45. GRB 190613B: AstroSat CZTI detection
  46. GRB 190611B: AstroSat CZTI detection
  47. Konus-Wind observation of GRB 190613B
  48. GRB 190615A: Insight-HXMT/HE detection
  49. Fermi trigger No 582304592 Global MASTER-Net observations report
  50. GRB 190615A: Fermi GBM Final Real-time Localization
  51. Fermi trigger No 582159815 Global MASTER-Net observations report
  52. GRB 190613B: GROND Detection of the Optical/NIR Afterglow
  53. GRB 190611B: CALET Gamma-Ray Burst Monitor detection
  54. GRB 190613B: Insight-HXMT/HE detection
  55. Konus-Wind observation of GRB 190611B
  56. Fermi trigger No 582115625 Global MASTER-Net observations report
  57. GRB 190613A: Fermi GBM detection
  58. GRB 190613B: Fermi GBM observation
  59. GRB 190611B: BALROG localization (Fermi Trigger 581986074 / GRB 190611950)
  60. IPN Triangulation of GRB 190611B
  61. GRB 190613B: BALROG localization (Fermi Trigger 582115625 / GRB 190613449)
  62. GRB 190613B: Fermi GBM Final Real-time Localization
  63. GRB 190609A: AstroSat CZTI detection
  64. GRB 190613A: MASTER OT detection
  65. GRB 190613A: BALROG localization (Fermi Trigger 582091643 / GRB 190613172)
  66. GRB 190613A: Fermi GBM Final Real-time Localization
  67. Fermi trigger No 582091643 Global MASTER-Net observations report
  68. Fermi trigger No 582012834 Global MASTER-Net observations report
  69. Fermi trigger No 581986074 Global MASTER-Net observations report
  70. GRB 190611B: Fermi GBM detection
  71. GRB 190610B: AstroSat CZTI detection
  72. Fermi trigger No 582004649 Global MASTER-Net observations report
  73. GRB 190612A: Fermi GBM Final Real-time Localization
  74. Konus-Wind observation of GRB 190606A
  75. Fermi trigger No 581889628 Global MASTER-Net observations report
  76. GRB 190610C: Fermi GBM Final Real-time Localization
  77. Fermi trigger No 581882394 Global MASTER-Net observations report
  78. GRB190610B: BALROG localization (Fermi Trigger 581882394 / GRB 190610750)
  79. GRB 190610B: Fermi GBM Final Real-time Localization
  80. Fermi trigger No 581841498 Global MASTER-Net observations report
  81. GRB190609A: BALROG localization (Fermi Trigger 581758450 / GRB 190609315)
  82. GRB 190609A: Fermi GBM Final Real-time Localization
  83. Fermi trigger No 581719018 Global MASTER-Net observations report
  84. GRB 190605A: AstroSat CZTI detection
  85. Fermi trigger No 581645543 Global MASTER-Net observations report
  86. GRB 190608A: Fermi GBM Final Real-time Localization
  87. GRB 190606A: Insight-HXMT/HE detection
  88. IPN Triangulation of GRB 190606A (short)
  89. GRB 190606A: Fermi GBM detection
  90. GRB 190530A: Further OAJ/OSN photometry and analysis
  91. GRB 190606A: Fermi-LAT detection
  92. Fermi trigger No 581478912 / GRB 190606A: AGILE/MCAL observations
  93. GRB 190604A: Insight-HXMT/HE detection
  94. Fermi trigger No 581478912 Global MASTER-Net observations report
  95. Fermi trigger No 581469752 Global MASTER-Net observations report
  96. GRB 190605A: Fermi GBM Final Real-time Localization
  97. GRB 190604A: AstroSat CZTI detection
  98. GRB 190530A: optical follow-up observations at Konkoly
  99. GRB190530A: Photometric follow-up with GROWTH-India telescope
  100. Fermi trigger No 581337762 Global MASTER-Net observations report

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