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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"

27817 results found.

  1. GRB 220831A: ATCA 5/9 GHz radio observations
  2. GRB 220907A: Swift-XRT position
  3. GRB 220907A: Swift detection of a burst
  4. GRB 220907A: Fermi GBM Final Real-time Localization
  5. Swift GRB220907.59: Global MASTER-Net observations report
  6. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  7. GRB 220831A: Swift-UVOT Upper Limits
  8. GRB 220905A: Fermi GBM Final Real-time Localization
  9. GRB 220831A: DECam detection of a possible optical counterpart
  10. GRB 220902A: Fermi GBM Final Real-time Localization
  11. GRB 220831A, VLT/HAWK-I near-infrared observations
  12. GRB 220831C: Fermi GBM Final Localization
  13. GRB 220831A: Fermi GBM observation
  14. GRB 220831A: Swift-XRT observations
  15. GRB 220831B: Fermi GBM Final Localization
  16. GRB 220831A: Swift ToO observations
  17. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  18. IceCube-220822A: No significant detection in HAWC
  19. Konus-Wind detection of GRB 220826A
  20. GRB 220827A: Fermi GBM Final Real-time Localization
  21. GRB 220826A: Swift-BAT refined analysis
  22. GRB 220826A: Fermi GBM observation
  23. GRB 220826A: Swift-XRT refined Analysis
  24. GRB 220825A: Fermi GBM observation
  25. GRB 220826A: Lesedi optical afterglow detection
  26. GRB 220826A: Swift/UVOT Detection
  27. Swift GRB 220826A: Global MASTER-Net observations report
  28. GRB 220826A: Enhanced Swift-XRT position
  29. GRB 220826A: Swift detection of a burst with an optical counterpart
  30. GRB 220825A: Swift/BAT-GUANO detection
  31. GRB 220825A: Fermi GBM Final Localization
  32. GRB 220823A: Fermi GBM detection
  33. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  34. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  35. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  36. GRB 220821A: Fermi GBM Final Real-time Localization
  37. Konus-Wind detection of GRB 220813A
  38. GRB 220813A: VLT optical observations and possible host galaxy
  39. GRB 220813A: Swift/UVOT Detection
  40. GRB 220810A: Further Swift-XRT observations
  41. GRB 220813A: Swift-XRT refined Analysis
  42. Swift GRB 220813A: Global MASTER-Net observations report
  43. GRB 220813A: Enhanced Swift-XRT position
  44. GRB 220813A: Swift detection of a burst with an optical counterpart
  45. GRB 220810A: Swift-XRT observations
  46. GRB 220719B: Detection by VZLUSAT-2
  47. GRB 220810A: Swift ToO observations
  48. GRB 220810A: MeerLICHT detection of two afterglow candidates
  49. GRB 220810A: Fermi GBM Final Real-time Localization
  50. GRB 220806A: Swift-BAT refined analysis
  51. IceCube Astrotrack Bronze 136918_45252263.amon is likely background
  52. GRB 220806A: Swift detection of a burst
  53. Swift GRB220806.76: Global MASTER-Net observations report
  54. GRB 220804A: Fermi GBM Final Localization
  55. GRB 220803A: AstroSat CZTI detection
  56. Konus-Wind detection of GRB 220730A (short)
  57. GRB 220730A: Swift-BAT refined analysis
  58. GRB 220730A: Fermi GBM detection
  59. GRB 220730A: Swift-XRT afterglow detection
  60. GRB 220730A: Swift/UVOT Upper Limits
  61. GRB 220730A: Swift-XRT observations
  62. GRB 220729A: AstroSat CZTI detection
  63. Swift GRB 220730A: Global MASTER-Net observations report
  64. GRB 220730A: Swift detection of a short hard burst
  65. GRB 220728A: Fermi GBM Final Real-time Localization
  66. GRB 220726A: Fermi GBM Final Real-time Localization
  67. GRB 220724A: Fermi GBM Final Real-time Localization
  68. GRB 220721A: Fermi GBM Final Real-time Localization
  69. GRB 220715A: CALET Gamma-Ray Burst Monitor detection
  70. GRB 220711B: CALET Gamma-Ray Burst Monitor detection
  71. GRB 220719A: Fermi GBM Final Real-time Localization
  72. GRB 220715B: Swift-BAT refined analysis
  73. GRB220714B: UVOT detections
  74. GRB 220715B: Fermi GBM detection
  75. GRB 220715B: Swift-XRT refined Analysis
  76. GRB 220715B: Swift/UVOT Upper Limits
  77. GRB 220715B: Enhanced Swift-XRT position
  78. GRB 220715B: BOOTES-network optical upper limits
  79. Swift GRB 220715B: Global MASTER-Net observations report
  80. GRB 220715B: Prompt enhanced Swift-XRT position
  81. GRB 220715B: Swift detection of a burst
  82. GRB 220715B: Fermi GBM Final Real-time Localization
  83. GRB 220714B: Swift-BAT refined analysis
  84. GRB 220714B: Fermi GBM observation
  85. GRB 220715A: AGILE/MCAL detection
  86. GRB 220714B: LCO Optical Observations
  87. GRB 220715A: Fermi GBM Final Real-time Localization
  88. GRB 220714B: Swift-XRT refined Analysis
  89. Swift/BAT Trigger 1116172 (=GRB 220714A) is not a real astrophysical event
  90. GRB 220714B: UVOT afterglow discovery
  91. GRB 220714B: Enhanced Swift-XRT position
  92. GRB 220713A: Fermi GBM Final Localization
  93. GRB 220714B: Swift detection of a burst
  94. GRB 220714B: Fermi GBM Final Real-time Localization
  95. GRB 220714A: Possible Swift detection of a burst
  96. GRB 220710A: Swift/UVOT Upper Limits
  97. GRB 220711C: Fermi GBM Observation
  98. GRB 220710A: Swift-XRT afterglow detection
  99. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  100. Konus-Wind detection of GRB 220711C

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