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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"

28262 results found.

  1. IceCube-220907A: No significant detection in HAWC
  2. Konus-Wind detection of GRB 220910A
  3. GRB 220910B: Fermi GBM Final Localization
  4. IPN triangulation of GRB 220910A (bright/long)
  5. GRB 220912A: AstroSat CZTI detection
  6. GRB 220831A: DECam optical counterpart follow-up
  7. GRB 220909A: Swift-XRT observations
  8. GRB 220912A: Fermi GBM Final Real-time Localization
  9. IPN triangulation of GRB 220905A
  10. GRB 220909A: Swift ToO observations
  11. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  12. GRB 220910A: AstroSat CZTI detection
  13. GRB 220910A: AGILE detection
  14. GRB 220909A: Fermi GBM Final Real-time Localization
  15. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  16. GRB 220907A: Nanshan/NEXT optical upper limits
  17. GRB 220907A: Swift/UVOT Upper Limits
  18. GRB 220907A: Swift-XRT refined Analysis
  19. GRB 220831A: ATCA 5/9 GHz radio observations
  20. GRB 220907A: Swift-XRT position
  21. GRB 220907A: Swift detection of a burst
  22. GRB 220907A: Fermi GBM Final Real-time Localization
  23. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  24. GRB 220905A: Fermi GBM Final Real-time Localization
  25. GRB 220831A: DECam detection of a possible optical counterpart
  26. GRB 220902A: Fermi GBM Final Real-time Localization
  27. GRB 220831C: Fermi GBM Final Localization
  28. GRB 220831A: Swift-XRT observations
  29. GRB 220831B: Fermi GBM Final Localization
  30. GRB 220831A: Swift ToO observations
  31. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  32. IceCube-220822A: No significant detection in HAWC
  33. Konus-Wind detection of GRB 220826A
  34. GRB 220827A: Fermi GBM Final Real-time Localization
  35. GRB 220826A: Swift-XRT refined Analysis
  36. GRB 220826A: Lesedi optical afterglow detection
  37. GRB 220826A: Swift/UVOT Detection
  38. GRB 220826A: iTelescope optical afterglow observations
  39. GRB 220826A: Enhanced Swift-XRT position
  40. GRB 220826A: Swift detection of a burst with an optical counterpart
  41. GRB 220825A: Swift/BAT-GUANO detection
  42. GRB 220825A: Fermi GBM Final Localization
  43. GRB 220823A: Fermi GBM detection
  44. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  45. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  46. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  47. GRB 220821A: Fermi GBM Final Real-time Localization
  48. Konus-Wind detection of GRB 220813A
  49. GRB 220813A: VLT optical observations and possible host galaxy
  50. GRB 220813A: Swift/UVOT Detection
  51. GRB 220810A: Further Swift-XRT observations
  52. GRB 220813A: Swift-XRT refined Analysis
  53. GRB 220813A: Enhanced Swift-XRT position
  54. GRB 220813A: Swift detection of a burst with an optical counterpart
  55. GRB 220810A: Swift-XRT observations
  56. GRB 220719B: Detection by VZLUSAT-2
  57. GRB 220810A: Swift ToO observations
  58. GRB 220810A: MeerLICHT detection of two afterglow candidates
  59. GRB 220810A: Fermi GBM Final Real-time Localization
  60. IceCube Astrotrack Bronze 136918_45252263.amon is likely background
  61. GRB 220806A: Swift detection of a burst
  62. GRB 220804A: Fermi GBM Final Localization
  63. GRB 220803A: AstroSat CZTI detection
  64. Konus-Wind detection of GRB 220730A (short)
  65. GRB 220730A: Fermi GBM detection
  66. GRB 220730A: Swift-XRT afterglow detection
  67. GRB 220730A: Swift/UVOT Upper Limits
  68. GRB 220730A: Swift-XRT observations
  69. GRB 220729A: AstroSat CZTI detection
  70. GRB 220730A: Swift detection of a short hard burst
  71. GRB 220728A: Fermi GBM Final Real-time Localization
  72. GRB 220726A: Fermi GBM Final Real-time Localization
  73. GRB 220724A: Fermi GBM Final Real-time Localization
  74. GRB 220715B: VIRT Optical Upper Limit
  75. GRB 220721A: Fermi GBM Final Real-time Localization
  76. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  77. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  78. GRB 220719A: Fermi GBM Final Real-time Localization
  79. GRB220714B: UVOT detections
  80. GRB 220715B: Fermi GBM detection
  81. GRB 220715B: Swift-XRT refined Analysis
  82. GRB 220715B: Swift/UVOT Upper Limits
  83. GRB 220715B: Enhanced Swift-XRT position
  84. GRB 220715B: BOOTES-network optical upper limits
  85. GRB 220715B: Prompt enhanced Swift-XRT position
  86. GRB 220715B: Swift detection of a burst
  87. GRB 220715B: Fermi GBM Final Real-time Localization
  88. GRB 220715A: AGILE/MCAL detection
  89. GRB 220714B: LCO Optical Observations
  90. GRB 220715A: Fermi GBM Final Real-time Localization
  91. GRB 220714B: Swift-XRT refined Analysis
  92. GRB 220714B: UVOT afterglow discovery
  93. GRB 220714B: Enhanced Swift-XRT position
  94. GRB 220713A: Fermi GBM Final Localization
  95. GRB 220714B: Swift detection of a burst
  96. GRB 220714B: Fermi GBM Final Real-time Localization
  97. GRB 220714A: Possible Swift detection of a burst
  98. GRB 220710A: Swift/UVOT Upper Limits
  99. GRB 220711B: 10.4 m GTC(+EMIR) observations
  100. GRB 220711B: 10.4 m GTC(+EMIR) observations

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