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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"

27828 results found.

  1. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  2. GRB 220910A: AstroSat CZTI detection
  3. GRB 220910A: AGILE detection
  4. GRB 220909A: Fermi GBM Final Real-time Localization
  5. GRB 220907A: Swift-BAT refined analysis
  6. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  7. IPN triangulation of GRB 220903A (long)
  8. GRB 220907A: Fermi GBM observation
  9. GRB 220907A: Nanshan/NEXT optical upper limits
  10. GRB 220907A: Swift/UVOT Upper Limits
  11. GRB 220907A: Swift-XRT refined Analysis
  12. GRB 220831A: ATCA 5/9 GHz radio observations
  13. GRB 220907A: Swift-XRT position
  14. GRB 220907A: Swift detection of a burst
  15. GRB 220907A: Fermi GBM Final Real-time Localization
  16. Swift GRB220907.59: Global MASTER-Net observations report
  17. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  18. GRB 220831A: Swift-UVOT Upper Limits
  19. GRB 220905A: Fermi GBM Final Real-time Localization
  20. GRB 220831A: DECam detection of a possible optical counterpart
  21. GRB 220902A: Fermi GBM Final Real-time Localization
  22. GRB 220831A, VLT/HAWK-I near-infrared observations
  23. GRB 220831C: Fermi GBM Final Localization
  24. GRB 220831A: Fermi GBM observation
  25. GRB 220831A: Swift-XRT observations
  26. GRB 220831B: Fermi GBM Final Localization
  27. GRB 220831A: Swift ToO observations
  28. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  29. IceCube-220822A: No significant detection in HAWC
  30. Konus-Wind detection of GRB 220826A
  31. GRB 220827A: Fermi GBM Final Real-time Localization
  32. GRB 220826A: Swift-BAT refined analysis
  33. GRB 220826A: Fermi GBM observation
  34. GRB 220826A: Swift-XRT refined Analysis
  35. GRB 220825A: Fermi GBM observation
  36. GRB 220826A: Lesedi optical afterglow detection
  37. GRB 220826A: Swift/UVOT Detection
  38. Swift GRB 220826A: Global MASTER-Net observations report
  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. Swift GRB 220813A: Global MASTER-Net observations report
  54. GRB 220813A: Enhanced Swift-XRT position
  55. GRB 220813A: Swift detection of a burst with an optical counterpart
  56. GRB 220810A: Swift-XRT observations
  57. GRB 220719B: Detection by VZLUSAT-2
  58. GRB 220810A: Swift ToO observations
  59. GRB 220810A: MeerLICHT detection of two afterglow candidates
  60. GRB 220810A: Fermi GBM Final Real-time Localization
  61. GRB 220806A: Swift-BAT refined analysis
  62. IceCube Astrotrack Bronze 136918_45252263.amon is likely background
  63. GRB 220806A: Swift detection of a burst
  64. Swift GRB220806.76: Global MASTER-Net observations report
  65. GRB 220804A: Fermi GBM Final Localization
  66. GRB 220803A: AstroSat CZTI detection
  67. Konus-Wind detection of GRB 220730A (short)
  68. GRB 220730A: Swift-BAT refined analysis
  69. GRB 220730A: Fermi GBM detection
  70. GRB 220730A: Swift-XRT afterglow detection
  71. GRB 220730A: Swift/UVOT Upper Limits
  72. GRB 220730A: Swift-XRT observations
  73. GRB 220729A: AstroSat CZTI detection
  74. Swift GRB 220730A: Global MASTER-Net observations report
  75. GRB 220730A: Swift detection of a short hard burst
  76. GRB 220728A: Fermi GBM Final Real-time Localization
  77. GRB 220726A: Fermi GBM Final Real-time Localization
  78. GRB 220724A: Fermi GBM Final Real-time Localization
  79. GRB 220721A: Fermi GBM Final Real-time Localization
  80. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  81. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  82. GRB 220719A: Fermi GBM Final Real-time Localization
  83. GRB 220715B: Swift-BAT refined analysis
  84. GRB220714B: UVOT detections
  85. GRB 220715B: Fermi GBM detection
  86. GRB 220715B: Swift-XRT refined Analysis
  87. GRB 220715B: Swift/UVOT Upper Limits
  88. GRB 220715B: Enhanced Swift-XRT position
  89. GRB 220715B: BOOTES-network optical upper limits
  90. Swift GRB 220715B: Global MASTER-Net observations report
  91. GRB 220715B: Prompt enhanced Swift-XRT position
  92. GRB 220715B: Swift detection of a burst
  93. GRB 220715B: Fermi GBM Final Real-time Localization
  94. GRB 220714B: Swift-BAT refined analysis
  95. GRB 220714B: Fermi GBM observation
  96. GRB 220715A: AGILE/MCAL detection
  97. GRB 220714B: LCO Optical Observations
  98. GRB 220715A: Fermi GBM Final Real-time Localization
  99. GRB 220714B: Swift-XRT refined Analysis
  100. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event

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