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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"

39456 results found.

  1. Fermi GBM trigger 666393834/220212892 is not a GRB
  2. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  3. IPN triangulation of GRB 220211A (short)
  4. GRB 220210A: Insight-HXMT/HE detection
  5. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  6. GRB 220210A: 1.5m OSN optical upper limit
  7. GRB 220210A: Fermi GBM detection
  8. Fermi GRB 220211B: Global MASTER-Net observations report
  9. GRB 220211B: Fermi GBM Final Real-time Localization
  10. GRB 220209A: Fermi-LAT detection
  11. GRB 220210A: Fermi-LAT detection
  12. GRB 220210A: AGILE detection
  13. GRB 220210A: BOOTES-5/JGT optical afterglow candidate discarded
  14. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  15. GRB 220210A: Swift/BAT-GUANO localization
  16. Fermi GRB 220211A: Global MASTER-Net observations report
  17. GRB 220211A: Fermi GBM Final Real-time Localization
  18. Fermi GRB 220210A: Global MASTER-Net observations report
  19. GRB 220210A: Fermi GBM Final Real-time Localization
  20. GRB 210919A: Maidanak optical observations
  21. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  22. GRB 220209A: Fermi GBM Detection
  23. GRB 220209A: GECAM detection
  24. GRB 220209A: AGILE/MCAL detection
  25. Fermi GRB 220209A: Global MASTER-Net observations report
  26. GRB 220209A: Fermi GBM Final Real-time Localization
  27. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  28. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  29. Konus-Wind detection of GRB 220130A
  30. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  31. Konus-Wind detection of GRB 220203A
  32. GRB 220203A: GECAM detection
  33. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  34. IPN triangulation of GRB 220203A (short)
  35. IPN triangulation of GRB 220130A
  36. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  37. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  38. IceCube Alert 220202.49: Global MASTER-Net observations report
  39. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  40. GRB 220201A: Fermi GBM Final Localization
  41. GRB 220128A: AstroSat CZTI detection
  42. GRB 220130A: Fermi GBM Observation
  43. Konus-Wind detection of GRB 220128A
  44. IPN triangulation of GRB 220128A (long)
  45. Fermi GRB 220131A: Global MASTER-Net observations report
  46. GRB 220131B: GECAM detection
  47. GRB 220130A: GECAM detection
  48. GRB 220131A: Fermi GBM Final Real-time Localization
  49. Fermi GRB 220129A: Global MASTER-Net observations report
  50. GRB 220129A: Fermi GBM Final Real-time Localization
  51. IceCube-211208A: the optical observation of the candidate PKS0735+178
  52. GRB 220127A: GECAM detection
  53. Konus-Wind detection of GRB 220124A
  54. IPN triangulation of GRB 220124A
  55. GRB 220124A: GECAM detection
  56. Fermi trigger No 664738369: Global MASTER-Net observations report
  57. GRB 220117A, GROND observations
  58. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  59. GRB 220117A: Terskol and AbAO optical upper limits
  60. GRB 220118A: TARGET optical upper limit
  61. GRB 220117B: TARGET optical upper limit
  62. GRB 220121B: GECAM detection
  63. IPN triangulation of a bright burst from SGR 1935+2154
  64. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  65. IPN triangulation of GRB 211226A
  66. GRB 220120A: Fermi GBM Final Localization
  67. GRB 220117C: Fermi GBM Observation
  68. GRB 220118A: 2.2m CAHA/CAFOS detections
  69. GRB 220118A: Fermi GBM detection
  70. GRB 220118A: COATLI Optical Observations
  71. GRB 220101A: KAO optical-R observation
  72. GRB 211221A: No V & R detection, KAO telescope
  73. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  74. GRB 220117C: Swift/BAT-GUANO arcminute localization
  75. GRB 220118A: Swift-BAT refined analysis
  76. GRB 220118A: Swift/UVOT Detection
  77. GRB 220118A: GIT optical observations
  78. GRB 220118A: Enhanced Swift-XRT position
  79. Swift GRB220118.50: Global MASTER-Net observations report
  80. GRB 220118A: MITSuME Akeno optical observation
  81. GRB 220117B: z-band limit
  82. Swift GRB 220118A: Global MASTER-Net observations report
  83. GRB 220118A: Swift detection of a burst with an optical counterpart
  84. GRB 220118A: Fermi GBM Final Real-time Localization
  85. GRB 220117A: MITSuME Akeno optical upper limits
  86. Fermi GBM Sub-Threshold Detection of GRB 220117A
  87. GRB 220117B: Swift-BAT refined analysis
  88. GRB 220117A: Swift-BAT refined analysis
  89. GRB 220117B: Swift/UVOT Upper Limits
  90. GRB 220117A: Swift/UVOT Upper Limits
  91. GRB 220117A: LCO Optical Observations
  92. GRB 220117A: VLT/X-shooter optical afterglow and redshift
  93. GRB 220117B: Swift-XRT refined Analysis
  94. GRB 220117A: Swift-XRT refined Analysis
  95. AMON IC_HAWC NuEm-220116A: No neutrino counterpart detected with ANTARES
  96. GRB 220117B: Nanshan/NEXT optical upper limit
  97. GRB 220117B: MITSuME Akeno optical upper limits
  98. GRB 220117B: Enhanced Swift-XRT position
  99. GRB 220117A: Enhanced Swift-XRT position
  100. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits

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