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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. IPN Triangulation of GRB 170207A (long/very bright)
  2. Konus-Wind observation of GRB 170206A
  3. GRB 170206A: POLAR observation
  4. IPN Triangulation of GRB 170206A (short/hard)
  5. GRB 170206A: Fermi-LAT detection
  6. GRB 170206A: Fermi GBM observation
  7. Fermi GBM trigger 508010837/170205755 is not a GRB
  8. Fermi GBM trigger 507959893/170205165 is not a GRB
  9. GRB 170131A: POLAR Observation
  10. GRB 170131A: Fermi GBM observation
  11. GRB 170131A detected in Swift/BAT ground processing
  12. GRB 170130A: POLAR Observation
  13. Konus-Wind observation of GRB 170127C (short/hard GRB with extended emission)
  14. GRB 170127C: Swift-XRT observations
  15. GRB 170127C: POLAR Observation
  16. GRB 170127C: AstroSat CZTI detection
  17. GRB 170124A: POLAR Observation
  18. GRB 170124A: CALET Gamma-Ray Burst Monitor detection
  19. GRB 170127B: Fermi GBM observation
  20. Konus-Wind observation of GRB 170126A
  21. GRB 170127C: Tiled Swift observations
  22. GRB 170127C (Fermi/GBM trigger 507173752): AGILE analysis
  23. GRB 170127C: Fermi-LAT detection
  24. GRB 170127C: Fermi GBM detection
  25. GRB 170126A: Fermi GBM observation
  26. LIGO/Virgo G270580: Fermi GBM Observations
  27. GRB 170115B: AGILE/SuperAGILE localisation
  28. GRB 170121B: AbAO optical observations
  29. GRB 170121B: MASTER early optical observations of the Swift possible XT
  30. GRB 170121B: AstroSat CZTI detection
  31. GRB 170121B: Swift-XRT and UVOT observations
  32. GRB 170121B: LCO FTN observations
  33. GRB 170121B: Fermi GBM detection
  34. GRB 170121B: Swift ToO observations
  35. GRB 170121B/Fermi trigger 506702667 MASTER-Amur OT detection
  36. GRB 170121A: POLAR Observation
  37. GRB 170120A: POLAR Observation
  38. LIGO/Virgo G270580: Fermi-LAT search for a high-energy gamma-ray counterpart
  39. GRB 170115B: Swift-XRT observations
  40. Konus-Wind observation of GRB 170115B
  41. IPN Triangulation of GRB 170115B
  42. GRB 170115B: AGILE detection
  43. GRB 170114B: POLAR Observation
  44. GRB 170114A: POLAR Observation
  45. GRB 170115B: Tiled Swift observations
  46. GRB 170115B: AstroSat CZTI (Veto) detection
  47. GRB 170115B: Fermi-LAT detection
  48. GRB 170115B: Fermi GBM detection
  49. GRB 170114A: Fermi GBM detection
  50. GRB 170112B: POLAR observation
  51. GRB 170113A: Fermi GBM observations
  52. GRB 161230A: POLAR Observation
  53. GRB 170109A: POLAR Observation
  54. LIGO/Virgo G268556: DESGW/DECam observations
  55. LIGO/Virgo G268556: Fermi-LAT search for high-energy gamma-ray counterpart
  56. LIGO/Virgo G268556: Fermi GBM Observations
  57. GRB 170101B: POLAR observation
  58. GRB 161228C: POLAR observation
  59. GRB 161229A: POLAR observation
  60. GRB 170101B: Astrosat CZTI detection
  61. GRB 170101B: Fermi GBM detection
  62. GRB 161228B: POLAR Observation
  63. GRB 161228A: POLAR Observation
  64. Fermi GBM trigger 504490076/161227005 is not a GRB
  65. Fermi GBM trigger 504233075/161224301 is not a GRB
  66. Fermi GBM trigger 504061556/161222046 is not a GRB
  67. Fermi GBM trigger 504043585/161221838 is not a GRB
  68. GRB 161218B: Astrosat CZTI detection
  69. Fermi GBM trigger 503982114/161221126 is not a GRB
  70. GRB 161217B: POLAR Observation
  71. Konus-Wind observation of GRB 161218B
  72. IPN Triangulation of GRB 161218B (long/very bright)
  73. GRB 161212A: POLAR Detection
  74. GRB 161218B: POLAR observation
  75. GRB 161218A: POLAR observation
  76. GRB 161218B: Fermi GBM detection
  77. GRB 161207A: POLAR observation
  78. GRB 161213A: POLAR Observation
  79. GRB 161207B: POLAR observation
  80. GRB 161205A: POLAR observation
  81. GRB 161210A: POLAR observation
  82. Fermi-LAT Gamma-ray Observations of IceCube-161210
  83. GRB 161207A: CALET Gamma-Ray Burst Monitor detection
  84. GRB 161206A: Fermi GBM detection
  85. Konus-Wind observation of GRB 161202A
  86. MASTER: Optical Blazar Flare Detection during Fermi trigger 502272781 inspection
  87. GRB 161129A: POLAR Detection
  88. GRB 161202A: Fermi-LAT detection
  89. Fermi GBM trigger 502258294/161201175 is not a GRB
  90. Fermi Gamma-ray Burst Monitor trigger 161130183 is not a GRB
  91. GRB 161129A: Fermi GBM Detection
  92. Fermi GBM trigger 501785179/161125699 is not a GRB
  93. Fermi GBM trigger 501779084/161125628 is not a GRB
  94. GRB 161119A: MASTER-SAAO possible OT detection during Fermi Alert
  95. Konus-Wind observation of GRB 161117A
  96. GRB 161117A: Fermi GBM detection/observation
  97. GRB 161109A: Swift/UVOT Upper Limits
  98. GRB 161109A: Swift-XRT observations
  99. GRB 161109A: Tiled Swift observations
  100. GRB 161109A: Fermi GBM observation

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