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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"

11105 results found.

  1. Fermi trigger No 623846261: Global MASTER-Net observations report
  2. Fermi trigger No 623873165: Global MASTER-Net observations report
  3. GRB 201008A: BALROG localization (Fermi Trigger 623846261 / GRB 201008443)
  4. IceCube-201007A - IceCube observation of a high-energy neutrino candidate track-like event
  5. Fermi GRB 201007A: Global MASTER-Net observations report
  6. GRB 201007A: Fermi GBM Final Real-time Localization
  7. GRB 201006A: Fermi GBM detection
  8. GRB 201006A is likely a short burst
  9. Fermi trigger No 623470566: Global MASTER-Net observations report
  10. GRB 201004A: Fermi GBM Final Localization
  11. Fermi trigger No 623493962: Global MASTER-Net observations report
  12. GRB 201001A: MITSuME Akeno optical upper limits
  13. GRB 201001A: Fermi GBM observation
  14. GRB 201001A: Fermi GBM Final Real-time Localization
  15. Fermi-LAT Gamma-ray Observations of IceCube-200929A
  16. IceCube-200929A: Upper limits from Fermi-GBM Observations
  17. GRB 200928B: Insight-HXMT/HE detection
  18. IceCube-200929A: IceCube observation of a high-energy neutrino candidate event
  19. IceCube-200926B: Upper limits from Fermi-GBM Observations
  20. IceCube-200926A: Upper limits from Fermi-GBM Observations
  21. Fermi GRB 200929A: Global MASTER-Net observations report
  22. GRB 200928B: AstroSat CZTI detection
  23. GRB 200929A: Fermi GBM Final Real-time Localization
  24. GRB 200928B: BALROG localization (Fermi Trigger 622991684 / GRB 200928552)
  25. GRB 200928B: Fermi GBM Final Real-time Localization
  26. Fermi-LAT Gamma-ray Observations of IceCube-200926B
  27. GRB 200928A: Fermi GBM Final Localization
  28. Fermi-LAT Gamma-ray Observations of IceCube-200926A
  29. IceCube-200926B: IceCube observation of a high-energy neutrino candidate event
  30. IceCube-200926A: IceCube observation of a high-energy neutrino candidate event
  31. Fermi GRB 200925A: Global MASTER-Net observations report
  32. GRB 200925A: Fermi GBM Final Real-time Localization
  33. Konus-Wind observation of GRB 200914A
  34. Fermi GRB 200924A: Global MASTER-Net observations report
  35. GRB 200924B: Fermi GBM Final Localization
  36. Fermi trigger No 622618714: Global MASTER-Net observations report
  37. GRB 200924A: Fermi GBM Final Real-time Localization
  38. Fermi GRB 200923A: Global MASTER-Net observations report
  39. GRB 200923A: Fermi GBM Final Real-time Localization
  40. Fermi-LAT Gamma-ray Observations of IceCube-200921A and detection of a new gamma-ray source, Fermi J1256.9+2630
  41. Fermi GRB 200922B: Global MASTER-Net observations report
  42. GRB 200922B: Fermi GBM Final Real-time Localization
  43. GRB 200919C: Insight-HXMT/HE detection
  44. IceCube-200921A: Upper limits from Fermi-GBM Observations
  45. IceCube-200921A: IceCube observation of a high-energy neutrino candidate event
  46. IPN triangulation of GRB 200920B (short)
  47. GRB 200920B: AGILE/MCAL detection of a burst
  48. GRB 200920A: Fermi GBM Final Real-time Localization
  49. Fermi GRB 200919C: Global MASTER-Net observations report
  50. GRB 200919C: Fermi GBM Final Real-time Localization
  51. Fermi GRB 200919B: Global MASTER-Net observations report
  52. GRB 200919B: Fermi GBM Final Real-time Localization
  53. Fermi-GBM Sub-Threshold Detection of GRB 200917A
  54. IceCube-200916A: Upper limits from Fermi-GBM Observations
  55. Fermi-LAT Gamma-ray Observations of IceCube-200916A
  56. IceCube-200916A - IceCube observation of a high-energy neutrino candidate track-like event
  57. Fermi GRB 200916A: Global MASTER-Net observations report
  58. GRB 200916A: Fermi GBM Final Real-time Localization
  59. Fermi trigger No 621893860: Global MASTER-Net observations report
  60. Fermi trigger No 621833240: Global MASTER-Net observations report
  61. Fermi GRB 200914A: Global MASTER-Net observations report
  62. GRB 200914A: AGILE detection
  63. GRB 200914A: Fermi GBM observation
  64. IceCube-200911A: No significant detection in HAWC
  65. Fermi-LAT Gamma-ray Observations of IceCube-200911A and detection of a new gamma-ray source, Fermi J0330.1+3743
  66. GRB 200914A: BALROG localization (Fermi Trigger 621780515 / GRB 200914534)
  67. GRB 200914A: Fermi GBM Final Real-time Localization
  68. IceCube-200911A: not observable by Fermi-GBM
  69. IceCube-200911A: IceCube observation of a high-energy neutrino candidate event
  70. GRB 200826A: uGMRT radio upper limit at 1.25 GHz
  71. GRB 200909A: AstroSat CZTI detection
  72. Fermi GRB 200909A: Global MASTER-Net observations report
  73. GRB 200909A: BALROG localization (Fermi Trigger 621316887 / GRB 200909168)
  74. GRB 200909A: Fermi GBM Final Real-time Localization
  75. Fermi GRB 200908A: Global MASTER-Net observations report
  76. GRB 200908A: Fermi GBM Final Real-time Localization
  77. Fermi GRB 200907C: Global MASTER-Net observations report
  78. GRB 200907C: Fermi GBM Final Real-time Localization
  79. Fermi GRB 200906A: Global MASTER-Net observations report
  80. GRB 200906A: EMIR/GTC NIR upper limit
  81. GRB 200906A: OSN 1.5m Upper Limit
  82. GRB 200906A: Fermi GBM detection
  83. GRB 200906A: Fermi GBM Final Real-time Localization
  84. Fermi GRB 200904A: Global MASTER-Net observations report
  85. GRB 200904A: Fermi GBM Final Real-time Localization
  86. Fermi GRB 200903C: Global MASTER-Net observations report
  87. GRB 200903A: Fermi GBM detection
  88. GRB 200903C: Fermi GBM Final Real-time Localization
  89. GRB 200903B: Insight-HXMT/HE detection
  90. AGILE detection of a burst (AGILE trigger no. 526185273)
  91. Fermi GRB 200903B: Global MASTER-Net observations report
  92. GRB 200903B: Fermi GBM Final Real-time Localization
  93. GRB 200903A: Fermi GBM Final Real-time Localization
  94. GRB 200901A: Fermi GBM observation
  95. Fermi GBM trigger 620564765/200831463 is not a GRB
  96. Fermi GRB 200830A: Global MASTER-Net observations report
  97. GRB 200829A: Fermi GBM detection
  98. GRB 200830A: BALROG localization (Fermi Trigger 620474063 / GRB 200830413)
  99. GRB 200830A: Fermi GBM Final Real-time Localization
  100. GRB 200826A: Lowell Discovery Telescope observations of ZTF20abwysqy

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