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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"

11649 results found.

  1. GRB 201020B: MASTER bright optical afterglow detection
  2. GRB 201020B: Fermi-LAT detection
  3. IceCube-201021A: IceCube observation of a high-energy neutrino candidate event
  4. GRB 201020B: AGILE detection
  5. GRB 201021A: Fermi GBM Final Real-time Localization
  6. GRB 201020B: Fermi GBM detection
  7. GRB 201020A: Fermi GBM observation
  8. Fermi GRB 201020B: Global MASTER-Net observations report
  9. GRB 201020B: Fermi GBM Final Real-time Localization
  10. GRB 201019B: AstroSat CZTI detection
  11. GRB 201016A: Insight-HXMT/HE detection
  12. GRB 201017A: SAO RAS optical observations
  13. GRB 201017A: GROWTH-India optical upper limit
  14. GRB 201019B: Fermi GBM correction to GCN 28687
  15. GRB 201019A: Fermi GBM Final Real-time Localization
  16. GRB 201017A: MITSuME Akeno optical upper limits
  17. GRB 201019A: Fermi GBM Final Real-time Localization
  18. GRB 201017A: Assy and Mondy optical observations, possible afterglow detection
  19. GRB 201017A: Fermi GBM detection
  20. GRB 201015A: classification as long GRB
  21. GRB 201017A: Fermi GBM Final Real-time Localization
  22. Fermi GBM Sub-Threshold Detection of GRB 201015A
  23. GRB 201016A: AstroSat CZTI detection
  24. GRB 201008A: Swift-XRT afterglow detection
  25. GRB 201016A: Fermi GBM detection
  26. Fermi GRB 201016B: Global MASTER-Net observations report
  27. GRB 201016B: BALROG localization (Fermi Trigger 624510986 / GRB 201016136)
  28. GRB 201016A: BALROG localization (Fermi Trigger 624500874 / GRB 201016019)
  29. GRB 201016B: Fermi GBM Final Real-time Localization
  30. GRB 201016A: Fermi GBM Final Real-time Localization
  31. Fermi-LAT Gamma-ray Observations of IceCube-201014A
  32. IceCube-201014A: Not observable by GBM
  33. IceCube-201014A - IceCube observation of a high-energy neutrino candidate track-like event
  34. GRB 201011A: Fermi GBM detection of a likely Long GRB in the direction of SGR 1830-0645
  35. Fermi trigger No 624139481: AGILE detection
  36. GRB 201012A: Fermi GBM Final Real-time Localization
  37. Fermi trigger No 624139481: Global MASTER-Net observations report
  38. Fermi trigger No 624121589: Global MASTER-Net observations report
  39. GRB 201008B: Fermi GBM Final Localization
  40. GRB 201008A: Swift-XRT observations
  41. GRB 201008A: Swift ToO observations
  42. IceCube-201007A: Upper limits from Fermi-GBM Observations
  43. GRB 201008A: Swift/BAT-GUANO detection and possible arcminute localization
  44. Fermi-LAT Gamma-ray Observations of IceCube-201007A
  45. Fermi trigger No 623846261: Global MASTER-Net observations report
  46. Fermi trigger No 623873165: Global MASTER-Net observations report
  47. GRB 201008A: BALROG localization (Fermi Trigger 623846261 / GRB 201008443)
  48. IceCube-201007A - IceCube observation of a high-energy neutrino candidate track-like event
  49. Fermi GRB 201007A: Global MASTER-Net observations report
  50. GRB 201007A: Fermi GBM Final Real-time Localization
  51. GRB 201006A: Fermi GBM detection
  52. GRB 201006A is likely a short burst
  53. Fermi trigger No 623470566: Global MASTER-Net observations report
  54. GRB 201004A: Fermi GBM Final Localization
  55. Fermi trigger No 623493962: Global MASTER-Net observations report
  56. GRB 201001A: MITSuME Akeno optical upper limits
  57. GRB 201001A: Fermi GBM observation
  58. GRB 201001A: Fermi GBM Final Real-time Localization
  59. Fermi-LAT Gamma-ray Observations of IceCube-200929A
  60. IceCube-200929A: Upper limits from Fermi-GBM Observations
  61. GRB 200928B: Insight-HXMT/HE detection
  62. IceCube-200929A: IceCube observation of a high-energy neutrino candidate event
  63. IceCube-200926B: Upper limits from Fermi-GBM Observations
  64. IceCube-200926A: Upper limits from Fermi-GBM Observations
  65. Fermi GRB 200929A: Global MASTER-Net observations report
  66. GRB 200928B: AstroSat CZTI detection
  67. GRB 200929A: Fermi GBM Final Real-time Localization
  68. GRB 200928B: BALROG localization (Fermi Trigger 622991684 / GRB 200928552)
  69. GRB 200928B: Fermi GBM Final Real-time Localization
  70. Fermi-LAT Gamma-ray Observations of IceCube-200926B
  71. GRB 200928A: Fermi GBM Final Localization
  72. Fermi-LAT Gamma-ray Observations of IceCube-200926A
  73. IceCube-200926B: IceCube observation of a high-energy neutrino candidate event
  74. IceCube-200926A: IceCube observation of a high-energy neutrino candidate event
  75. Fermi GRB 200925A: Global MASTER-Net observations report
  76. GRB 200925A: Fermi GBM Final Real-time Localization
  77. Konus-Wind observation of GRB 200914A
  78. Fermi GRB 200924A: Global MASTER-Net observations report
  79. GRB 200924B: Fermi GBM Final Localization
  80. Fermi trigger No 622618714: Global MASTER-Net observations report
  81. GRB 200924A: Fermi GBM Final Real-time Localization
  82. Fermi GRB 200923A: Global MASTER-Net observations report
  83. GRB 200923A: Fermi GBM Final Real-time Localization
  84. Fermi-LAT Gamma-ray Observations of IceCube-200921A and detection of a new gamma-ray source, Fermi J1256.9+2630
  85. Fermi GRB 200922B: Global MASTER-Net observations report
  86. GRB 200922B: Fermi GBM Final Real-time Localization
  87. GRB 200919C: Insight-HXMT/HE detection
  88. IceCube-200921A: Upper limits from Fermi-GBM Observations
  89. IceCube-200921A: IceCube observation of a high-energy neutrino candidate event
  90. IPN triangulation of GRB 200920B (short)
  91. GRB 200920B: AGILE/MCAL detection of a burst
  92. GRB 200920A: Fermi GBM Final Real-time Localization
  93. Fermi GRB 200919C: Global MASTER-Net observations report
  94. GRB 200919C: Fermi GBM Final Real-time Localization
  95. Fermi GRB 200919B: Global MASTER-Net observations report
  96. GRB 200919B: Fermi GBM Final Real-time Localization
  97. Fermi-GBM Sub-Threshold Detection of GRB 200917A
  98. IceCube-200916A: Upper limits from Fermi-GBM Observations
  99. Fermi-LAT Gamma-ray Observations of IceCube-200916A
  100. IceCube-200916A - IceCube observation of a high-energy neutrino candidate track-like event

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