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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"

14980 results found.

  1. Swift GRB200716C: Global MASTER-Net OT detection
  2. GRB 200716C: Swift detection of a burst with an optical counterpart
  3. GRB 200716C: Fermi GBM Final Real-time Localization
  4. IPN triangulation of GRB 200716A
  5. GRB 200716A: Fermi GBM detection
  6. GRB 200716B: AstroSat CZTI detection
  7. GRB 200716A: AstroSat CZTI detection
  8. GRB 200716A: AGILE detection
  9. GRB 200715A: Swift-XRT afterglow detection
  10. GRB 200716B: Fermi GBM Final Real-time Localization
  11. GRB 200716A: Fermi GBM Final Real-time Localization
  12. GRB 200714E: AGILE detection
  13. GRB 200714E: Swift/BAT-GUANO detection and arcminute localization
  14. GRB 200714E: Fermi GBM Final Real-time Localization
  15. GRB 200714D: Fermi GBM Final Real-time Localization
  16. GRB 200714C: Fermi GBM Final Real-time Localization
  17. GRB 200711A: Insight-HXMT/HE detection
  18. GRB 200714B: Fermi GBM Final Real-time Localization
  19. GRB 200714A: Fermi GBM Final Real-time Localization
  20. GRB 200713A: Swift detection of a burst
  21. GRB 200711A: CALET Gamma-Ray Burst Monitor detection
  22. GRB 200711A: Fermi-LAT marginal detection
  23. GRB 200711A: KAIT Optical Upper Limit
  24. GRB 200711A: Fermi GBM detection
  25. GRB 200711A: Swift detection of a burst
  26. GRB 200711A: Fermi GBM Final Real-time Localization
  27. HAWC-200907A: No Neutrino Counterpart detected with ANTARES
  28. GRB 200710A: Fermi GBM Final Real-time Localization
  29. GRB 200709A: Fermi GBM Final Real-time Localization
  30. GRB 200707A: Insight-HXMT/HE detection
  31. GRB 200707A: Fermi GBM Final Localization
  32. GRB 200704A: Insight-HXMT/HE detection
  33. GRB 200706A: Fermi GBM Final Real-time Localization
  34. GRB 200705A: Fermi GBM Final Real-time Localization
  35. GRB 200703B: Insight-HXMT/HE detection
  36. GRB 200703B: AstroSat CZTI detection
  37. GRB 200703B: Fermi GBM Final Real-time Localization
  38. GRB 200703A: Fermi GBM Final Real-time Localization
  39. GRB 200702A: Fermi GBM Final Real-time Localization
  40. Trigger 980513: Swift detection of SGR Swift J1818.0-1607
  41. Fermi-GBM Sub-Threshold Detection of GRB 200701A
  42. GRB 200701A: Swift detection of a burst
  43. GRB 200630B: Fermi GBM Final Localization
  44. GRB 200630A: Fermi GBM detection
  45. GRB 200629A: AstroSat CZTI detection
  46. GRB 200630A: Swift detection of a burst
  47. GRB 200629A: Fermi GBM Final Real-time Localization
  48. Konus-Wind detection of short/hard GRB 200623B
  49. GRB 200625A: Fermi-LAT detection is likely a flare from PKS 1127-14
  50. GRB 200626A: Fermi GBM Final Real-time Localization
  51. GRB 200625A: Fermi GBM Final Real-time Localization
  52. Updated catalog of X-ray bursts of SGR J1935+2154 from Insight-HXMT observations
  53. IPN triangulation of GRB 200623B (short)
  54. GRB 200623A: OAJ deep multi-color imaging, XRT #2 is pre-detected
  55. GRB 200623B: Fermi GBM Final Real-time Localization
  56. IceCube-200620A: No significant detection in HAWC
  57. GRB 200623A: Swift/BAT-GUANO detection and arcminute localization of a short GRB
  58. GRB 200623A: Fermi GBM Final Real-time Localization
  59. GRB 200622A: Fermi GBM Final Real-time Localization
  60. IceCube-200620A: MASTER previous detection of ZTF20abgvabi/AT2020ncr
  61. IceCube-200620A: No ANTARES neutrino counterpart
  62. IceCube-200620A - IceCube observation of a high-energy neutrino candidate track-like event
  63. GRB 200619C: Fermi GBM Final Real-time Localization
  64. GRB 200619B: AstroSat CZTI detection
  65. GRB 200619A: Fermi GBM observation
  66. GRB 200619A: AGILE detection
  67. GRB 200619B: Fermi GBM Final Real-time Localization
  68. GRB 200619A: Insight-HXMT/HE detection
  69. GRB 200617A: Insight-HXMT/HE detection
  70. IceCube-200530A - SN2020lls likely unrelated
  71. GRB 200615B: CALET Gamma-Ray Burst Monitor detection
  72. Swift-XRT observations of IceCube 200615A
  73. IceCube-200615A: No significant detection in HAWC
  74. IceCube-200614A: No significant detection in HAWC
  75. GRB 200616B: Fermi GBM Final Real-time Localization
  76. Fermi-LAT Gamma-ray Observations of IceCube-200614A and detection of a new gamma-ray source, Fermi J0202.8+3132
  77. GRB 200613A: CALET Gamma-Ray Burst Monitor detection
  78. GRB 200615B: MAXI/GSC detection
  79. GRB 200616A: Fermi GBM Final Real-time Localization
  80. IceCube-200615A: IceCube observation of a high-energy neutrino candidate event
  81. GRB 200615A: Fermi GBM Final Real-time Localization
  82. GRB 200613A: Swift/UVOT Detection
  83. IceCube-200614A - IceCube observation of a high-energy neutrino candidate track-like event
  84. GRB 200614A: Fermi GBM Final Real-time Localization
  85. GRB 200613A: Swift-XRT afterglow detection
  86. GRB 200613A: Candidate afterglow from OAJ
  87. GRB 200612A: Fermi GBM detection
  88. GRB 200613A: Fermi-LAT detection
  89. GRB 200613A: Fermi GBM Final Real-time Localization
  90. Konus-Wind observation of ultra-long GRB 200612A
  91. Swift GRB200612.19: Global MASTER-Net OT detection
  92. GRB 200612A: Swift detection of a burst
  93. GRB 200609A: Insight-HXMT/HE detection
  94. Konus-Wind detection of GRB 200605A
  95. GRB 200605A: CALET Gamma-Ray Burst Monitor detection
  96. GRB 200609A: Fermi GBM Final Real-time Localization
  97. GRB 200608A: Swift detection of a burst
  98. GRB 200607B: AstroSat CZTI detection
  99. GRB 200607B: Fermi GBM Final Real-time Localization
  100. IPN triangulation of GRB 200605A (short)

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