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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"

27295 results found.

  1. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  2. Swift trigger 1210856 is not astrophysical
  3. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  4. GRB 240123A: Swift-BAT refined analysis
  5. IceCube Alert 240123.48: Global MASTER-Net observations report
  6. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  7. Fermi/GBM trigger 727752941: BALROG analysis retraction
  8. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  9. Fermi GRB 240123B: Global MASTER-Net observations report
  10. GRB 240122A: Swift/UVOT Upper Limits
  11. GRB 240123A: Swift-XRT refined Analysis
  12. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  13. Fermi GBM Sub-Threshold Detection of GRB 240123A
  14. GRB 240123B: Fermi GBM Final Real-time Localization
  15. GRB 240118A: Swift/UVOT Upper Limits
  16. GRB 240122B: Glowbug gamma-ray detection
  17. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  18. Swift GRB240123.46: Global MASTER-Net observations report
  19. GRB 240122A: VLT/X-shooter redshift confirmation
  20. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  21. GRB 240122A: GOTO optical counterpart candidate
  22. IPN triangulation of GRB 240119A (short)
  23. GRB 240119A: GECAM detection of a short burst
  24. GRB 240118C: GECAM-B detection of a long burst
  25. GRB 240118C: Fermi GBM Observation
  26. Fermi GRB 240119A: Global MASTER-Net observations report
  27. GRB 240119A: Fermi GBM Final Localization
  28. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  29. GRB 240118C: Swift/BAT-GUANO detection of a burst
  30. GRB 240118A: GRBAlpha detection
  31. GRB 240115A: Fermi GBM Observation
  32. Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events
  33. GRB 240118C: Fermi GBM Final Localization
  34. GRB 240118D: AstroSat CZTI detection
  35. GRB 240117A: AstroSat CZTI detection
  36. Fermi GRB 240118B: Global MASTER-Net observations report
  37. GRB 240117A: Glowbug gamma-ray detection
  38. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  39. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  40. GRB 240118A: NuSTAR Detection of a Long GRB
  41. GRB 240118A: Fermi GBM Observation
  42. GRB 240118B: Fermi GBM Final Real-time Localization
  43. LAT GRB240118.08: Global MASTER-Net observations report
  44. GRB 240118A: Fermi-LAT detection
  45. GRID detection of GRB 231230A
  46. GRB 240118A: Fermi GBM Final Real-time Localization
  47. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  48. Swift Trigger 1209406 is not an astrophysical event
  49. Swift Triggers 1209401 and 1209403 are not astrophysical events
  50. Swift Triggers 1209371 through 1209374 are not astrophysical events
  51. Swift Triggers 1209369 and 1209370 are not astrophysical events
  52. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  53. GRB 240115B: Fermi GBM Detection
  54. GRB 240112D: Glowbug gamma-ray detection
  55. GRB 240112C: Glowbug gamma-ray detection
  56. GRB 240112C: VZLUSAT-2 detection
  57. GRB 240107A: VZLUSAT-2 detection
  58. Integral GRB240115.70: Global MASTER-Net observations report
  59. Fermi GRB 240115B: Global MASTER-Net observations report
  60. GRB 240115B: Fermi GBM Final Real-time Localization
  61. Fermi GRB 240115A: Global MASTER-Net observations report
  62. GRB 240115A: Fermi GBM Final Real-time Localization
  63. GRB 240112C: GRBAlpha detection
  64. GRB 240112C: Swift/UVOT Detection
  65. GRB 240112C: Fermi GBM Detection
  66. Fermi trigger No 726773850: Global MASTER-Net observations report
  67. GRB 240112C: Swift-XRT refined Analysis
  68. GRB 240112E: Fermi GBM Final Localization
  69. Fermi GRB 240112D: Global MASTER-Net observations report
  70. GRB 240112D: Fermi GBM Final Real-time Localization
  71. Fermi trigger No 726774492: Global MASTER-Net observations report
  72. Swift GRB 240112C: Global MASTER-Net observations report
  73. Fermi GRB 240112B: Global MASTER-Net observations report
  74. GRB 240109A: Swift-BAT refined analysis
  75. GRB 240112C: Swift detection of a burst with an optical counterpart
  76. GRB 240112B: Fermi GBM Final Real-time Localization
  77. GRB 240112A: GECAM detection of a burst
  78. GRB 240109A: Fermi GBM Observation
  79. GRB 240110A: AstroSat CZTI detection
  80. GRB 240108A: Glowbug gamma-ray detection
  81. GRB 240109B: Fermi GBM Final Real-time Localization
  82. Swift GRB240109.17: Global MASTER-Net observations report
  83. GRB 240109A: Swift detection of a short burst
  84. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  85. GRB 240106A: GRBAlpha detection
  86. Fermi trigger No 726347794: Global MASTER-Net observations report
  87. GRB 240106B: Fermi GBM Final Real-time Localization
  88. Fermi trigger No 726194053: Global MASTER-Net observations report
  89. GRB 240106A: Fermi GBM Final Real-time Localization
  90. IPN triangulation of GRB 240101C (short)
  91. GRB GRB240101C: Fermi GBM observation
  92. IceCube Alert 240105.52: Global MASTER-Net observations report
  93. GRB 240102A: 1.3m DFOT optical upper limit
  94. GRB 240101B: 1.3m DFOT optical upper limit
  95. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  96. GRB 240102C: AstroSat CZTI detection
  97. GRB 240102A: Swift-BAT refined analysis
  98. GRB 240102A: Swift/UVOT Upper Limits
  99. GRB 231230A: Swift-BAT refined analysis
  100. GRB 240101A: Swift-BAT refined analysis

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