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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"

11622 results found.

  1. GRB 201016A: BALROG localization (Fermi Trigger 624500874 / GRB 201016019)
  2. GRB 201016B: Fermi GBM Final Real-time Localization
  3. GRB 201016A: Fermi GBM Final Real-time Localization
  4. Fermi-LAT Gamma-ray Observations of IceCube-201014A
  5. IceCube-201014A: Not observable by GBM
  6. IceCube-201014A - IceCube observation of a high-energy neutrino candidate track-like event
  7. GRB 201011A: Fermi GBM detection of a likely Long GRB in the direction of SGR 1830-0645
  8. Fermi trigger No 624139481: AGILE detection
  9. GRB 201012A: Fermi GBM Final Real-time Localization
  10. Fermi trigger No 624139481: Global MASTER-Net observations report
  11. Fermi trigger No 624121589: Global MASTER-Net observations report
  12. GRB 201008B: Fermi GBM Final Localization
  13. GRB 201008A: Swift-XRT observations
  14. GRB 201008A: Swift ToO observations
  15. IceCube-201007A: Upper limits from Fermi-GBM Observations
  16. GRB 201008A: Swift/BAT-GUANO detection and possible arcminute localization
  17. Fermi-LAT Gamma-ray Observations of IceCube-201007A
  18. Fermi trigger No 623846261: Global MASTER-Net observations report
  19. Fermi trigger No 623873165: Global MASTER-Net observations report
  20. GRB 201008A: BALROG localization (Fermi Trigger 623846261 / GRB 201008443)
  21. IceCube-201007A - IceCube observation of a high-energy neutrino candidate track-like event
  22. Fermi GRB 201007A: Global MASTER-Net observations report
  23. GRB 201007A: Fermi GBM Final Real-time Localization
  24. GRB 201006A: Fermi GBM detection
  25. GRB 201006A is likely a short burst
  26. Fermi trigger No 623470566: Global MASTER-Net observations report
  27. GRB 201004A: Fermi GBM Final Localization
  28. Fermi trigger No 623493962: Global MASTER-Net observations report
  29. GRB 201001A: MITSuME Akeno optical upper limits
  30. GRB 201001A: Fermi GBM observation
  31. GRB 201001A: Fermi GBM Final Real-time Localization
  32. Fermi-LAT Gamma-ray Observations of IceCube-200929A
  33. IceCube-200929A: Upper limits from Fermi-GBM Observations
  34. GRB 200928B: Insight-HXMT/HE detection
  35. IceCube-200929A: IceCube observation of a high-energy neutrino candidate event
  36. IceCube-200926B: Upper limits from Fermi-GBM Observations
  37. IceCube-200926A: Upper limits from Fermi-GBM Observations
  38. Fermi GRB 200929A: Global MASTER-Net observations report
  39. GRB 200928B: AstroSat CZTI detection
  40. GRB 200929A: Fermi GBM Final Real-time Localization
  41. GRB 200928B: BALROG localization (Fermi Trigger 622991684 / GRB 200928552)
  42. GRB 200928B: Fermi GBM Final Real-time Localization
  43. Fermi-LAT Gamma-ray Observations of IceCube-200926B
  44. GRB 200928A: Fermi GBM Final Localization
  45. Fermi-LAT Gamma-ray Observations of IceCube-200926A
  46. IceCube-200926B: IceCube observation of a high-energy neutrino candidate event
  47. IceCube-200926A: IceCube observation of a high-energy neutrino candidate event
  48. Fermi GRB 200925A: Global MASTER-Net observations report
  49. GRB 200925A: Fermi GBM Final Real-time Localization
  50. Konus-Wind observation of GRB 200914A
  51. Fermi GRB 200924A: Global MASTER-Net observations report
  52. GRB 200924B: Fermi GBM Final Localization
  53. Fermi trigger No 622618714: Global MASTER-Net observations report
  54. GRB 200924A: Fermi GBM Final Real-time Localization
  55. Fermi GRB 200923A: Global MASTER-Net observations report
  56. GRB 200923A: Fermi GBM Final Real-time Localization
  57. Fermi-LAT Gamma-ray Observations of IceCube-200921A and detection of a new gamma-ray source, Fermi J1256.9+2630
  58. Fermi GRB 200922B: Global MASTER-Net observations report
  59. GRB 200922B: Fermi GBM Final Real-time Localization
  60. GRB 200919C: Insight-HXMT/HE detection
  61. IceCube-200921A: Upper limits from Fermi-GBM Observations
  62. IceCube-200921A: IceCube observation of a high-energy neutrino candidate event
  63. IPN triangulation of GRB 200920B (short)
  64. GRB 200920B: AGILE/MCAL detection of a burst
  65. GRB 200920A: Fermi GBM Final Real-time Localization
  66. Fermi GRB 200919C: Global MASTER-Net observations report
  67. GRB 200919C: Fermi GBM Final Real-time Localization
  68. Fermi GRB 200919B: Global MASTER-Net observations report
  69. GRB 200919B: Fermi GBM Final Real-time Localization
  70. Fermi-GBM Sub-Threshold Detection of GRB 200917A
  71. IceCube-200916A: Upper limits from Fermi-GBM Observations
  72. Fermi-LAT Gamma-ray Observations of IceCube-200916A
  73. IceCube-200916A - IceCube observation of a high-energy neutrino candidate track-like event
  74. Fermi GRB 200916A: Global MASTER-Net observations report
  75. GRB 200916A: Fermi GBM Final Real-time Localization
  76. Fermi trigger No 621893860: Global MASTER-Net observations report
  77. Fermi trigger No 621833240: Global MASTER-Net observations report
  78. Fermi GRB 200914A: Global MASTER-Net observations report
  79. GRB 200914A: AGILE detection
  80. GRB 200914A: Fermi GBM observation
  81. IceCube-200911A: No significant detection in HAWC
  82. Fermi-LAT Gamma-ray Observations of IceCube-200911A and detection of a new gamma-ray source, Fermi J0330.1+3743
  83. GRB 200914A: BALROG localization (Fermi Trigger 621780515 / GRB 200914534)
  84. GRB 200914A: Fermi GBM Final Real-time Localization
  85. IceCube-200911A: not observable by Fermi-GBM
  86. IceCube-200911A: IceCube observation of a high-energy neutrino candidate event
  87. GRB 200826A: uGMRT radio upper limit at 1.25 GHz
  88. GRB 200909A: AstroSat CZTI detection
  89. Fermi GRB 200909A: Global MASTER-Net observations report
  90. GRB 200909A: BALROG localization (Fermi Trigger 621316887 / GRB 200909168)
  91. GRB 200909A: Fermi GBM Final Real-time Localization
  92. Fermi GRB 200908A: Global MASTER-Net observations report
  93. GRB 200908A: Fermi GBM Final Real-time Localization
  94. Fermi GRB 200907C: Global MASTER-Net observations report
  95. GRB 200907C: Fermi GBM Final Real-time Localization
  96. Fermi GRB 200906A: Global MASTER-Net observations report
  97. GRB 200906A: EMIR/GTC NIR upper limit
  98. GRB 200906A: OSN 1.5m Upper Limit
  99. GRB 200906A: Fermi GBM detection
  100. GRB 200906A: Fermi GBM Final Real-time Localization

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