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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"

27939 results found.

  1. GRB 220209A: Fermi GBM Final Real-time Localization
  2. IceCube-220205B: No neutrino counterpart candidates in ANTARES search
  3. Konus-Wind detection of GRB 220130A
  4. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  5. Konus-Wind detection of GRB 220203A
  6. GRB 220203A: GECAM detection
  7. IceCube-220205A - IceCube observation of a high-energy neutrino candidate track-like event
  8. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  9. IPN triangulation of GRB 220203A (short)
  10. IPN triangulation of GRB 220130A
  11. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  12. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  13. IceCube-220202A: IceCube observation of a high-energy neutrino candidate track-like event
  14. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  15. GRB 220201A: Fermi GBM Final Localization
  16. GRB 220128A: AstroSat CZTI detection
  17. Konus-Wind detection of GRB 220128A
  18. IPN triangulation of GRB 220128A (long)
  19. GRB 220131B: GECAM detection
  20. GRB 220130A: GECAM detection
  21. GRB 220131A: Fermi GBM Final Real-time Localization
  22. GRB 220129A: Fermi GBM Final Real-time Localization
  23. GRB 220127A: GECAM detection
  24. Konus-Wind detection of GRB 220124A
  25. IPN triangulation of GRB 220124A
  26. GRB 220124A: GECAM detection
  27. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  28. GRB 220117A: Terskol and AbAO optical upper limits
  29. GRB 220118A: TARGET optical upper limit
  30. GRB 220117B: TARGET optical upper limit
  31. GRB 220121B: GECAM detection
  32. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  33. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  34. IPN triangulation of GRB 211226A
  35. GRB 220120A: Fermi GBM Final Localization
  36. GRB 220117C: Fermi GBM Observation
  37. GRB 220118A: 2.2m CAHA/CAFOS detections
  38. GRB 220118A: Fermi GBM detection
  39. GRB 220118A: COATLI Optical Observations
  40. GRB 211221A: No V & R detection, KAO telescope
  41. GRB 220117C: Swift/BAT-GUANO arcminute localization
  42. Swift currently in safe hold with science slews disabled
  43. GRB 220118A: Swift-BAT refined analysis
  44. GRB 220118A: Swift/UVOT Detection
  45. GRB 220118A: GIT optical observations
  46. GRB 220118A: Enhanced Swift-XRT position
  47. Swift GRB220118.50: Global MASTER-Net observations report
  48. GRB 220118A: MITSuME Akeno optical observation
  49. Swift GRB 220118A: Global MASTER-Net observations report
  50. GRB 220118A: Swift detection of a burst with an optical counterpart
  51. GRB 220118A: Fermi GBM Final Real-time Localization
  52. GRB 220117A: MITSuME Akeno optical upper limits
  53. Fermi GBM Sub-Threshold Detection of GRB 220117A
  54. GRB 220117B: Swift-BAT refined analysis
  55. GRB 220117A: Swift-BAT refined analysis
  56. GRB 220117B: Swift/UVOT Upper Limits
  57. GRB 220117A: Swift/UVOT Upper Limits
  58. GRB 220117A: LCO Optical Observations
  59. Fermi-LAT Gamma-ray Observations of IceCube-220115A and detection of a new gamma-ray source, Fermi J2350.2+2620
  60. GRB 220117B: Swift-XRT refined Analysis
  61. GRB 220117A: Swift-XRT refined Analysis
  62. AMON IC_HAWC NuEm-220116A: No neutrino counterpart detected with ANTARES
  63. GRB 220117B: Nanshan/NEXT optical upper limit
  64. GRB 220117B: MITSuME Akeno optical upper limits
  65. GRB 220117B: Enhanced Swift-XRT position
  66. GRB 220117A: Enhanced Swift-XRT position
  67. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  68. Swift GRB 220117A: Global MASTER-Net observations report
  69. Swift GRB 220117B: Global MASTER-Net observations report
  70. GRB 220117B: Swift detection of a burst
  71. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  72. GRB 220117A: Swift detection of a burst
  73. GRB 220101A: The most powerful GRB and BDHN I in 26 years
  74. GRB 220115B: Fermi GBM Final Real-time Localization
  75. GRB 210919A: LBT spectroscopic redshift of the host galaxy candidates
  76. GRB 220115A: Fermi GBM Final Real-time Localization
  77. IceCube-220115A - IceCube observation of a high-energy neutrino candidate track-like event
  78. GRB 220114A: Fermi GBM Final Localization
  79. GRB 220101A: continued 1.3m DFOT optical observations of a high-redshift afterglow
  80. GRB 220111A: AstroSat CZTI detection
  81. Konus-Wind detection of GRB 220101A (correction to GCN 31433)
  82. GRB 220111A: Fermi GBM Final Real-time Localization
  83. Konus-Wind detection of GRB 220101A
  84. Konus-Wind detection of GRB 220107B
  85. Konus-Wind detection of GRB 220107A
  86. Confirmation of the X-ray afterglow of GRB 220107B
  87. GRB 220107A: 6m BTA spectroscopic redshift
  88. GRB 220108A: Swift/BAT-GUANO detection outside the coded FOV
  89. GRB 220101A: SAO RAS optical observations
  90. GRB 220107A: AbAO and Terskol optical observations
  91. GRB 220107B: Nanshan/NEXT optical upper limits and host galaxy candidate
  92. GRB 220107A: Nanshan/NEXT optical observations
  93. GRB 220107A: Swift/UVOT Detection
  94. GRB 220107A: MITSuME Akeno optical observation
  95. GRB 220107B: AstroSat CZTI detection
  96. GRB 220107B: Swift-XRT afterglow detection
  97. GRB 220107A: Swift-XRT afterglow detection
  98. GRB 220107B: Fermi-LAT detection
  99. GRB 220107A: AstroSat CZTI detection
  100. GRB 220107B: Tiled Swift observations

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