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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"

28232 results found.

  1. GRB 240205B: ATCA detection of radio counterpart
  2. GRB 240205B: REM detection of the optical/NIR afterglow
  3. GRB 240204A: AstroSat CZTI detection
  4. GRB 240204A: Mondy optical afterglow observations
  5. GRB 240204A : OHP/T193/T120 optical afterglow fading detection
  6. GRB 240205B: GECAM detection of a long burst
  7. GRB 240205B: Skynet Optical Afterglow Observations
  8. GRB 240205B: BOOTES-7 optical afterglow follow-up
  9. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  10. GRB 240205B: Swift detection of a burst
  11. GRB 240205B: Fermi GBM Final Real-time Localization
  12. GRB 240204A: Fermi GBM Observation
  13. GRB 240205A: Fermi GBM Final Real-time Localization
  14. GRB 240204a: Liverpool Telescope optical afterglow detection
  15. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  16. GRB 240204A: Enhanced Swift-XRT position
  17. GRB 240204A: Mondy optical afterglow candidate
  18. GRB 240204A: Swift detection of a burst
  19. IceCube-240204A - IceCube observation of a high-energy neutrino candidate track-like event
  20. GRB 240204A: Fermi GBM Final Real-time Localization
  21. Konus-Wind detection of GRB 240124B
  22. Konus-Wind detection of GRB 240123C
  23. IPN triangulation of GRB 240124B
  24. GRB 240201A: AstroSat CZTI detection
  25. IPN triangulation of GRB 240125B (short)
  26. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  27. IPN triangulation of GRB 240125A (short)
  28. GRB 240128A: Glowbug gamma-ray detection
  29. GRB 240128A: Swift-XRT observations
  30. GRB 240128A: GRBAlpha detection
  31. GRB 240128A: Tiled Swift observations
  32. GRB 240128A: CALET Gamma-Ray Burst Monitor detection
  33. GRB 240128A: MAXI/GSC detection
  34. GRB 240125A: GRBAlpha detection
  35. GRB 240123C: GRBAlpha detection
  36. GRB 240122A: ATCA detection of radio counterpart
  37. GRB 240127A: Fermi GBM Final Real-time Localization
  38. GRB 240125A: CALET Gamma-Ray Burst Monitor detection
  39. GRB 240125A: AstroSat CZTI detection of a short burst
  40. GRB 240124B: AstroSat CZTI detection
  41. GRB 240123C: AstroSat CZTI detection
  42. GRB 240125B: Fermi GBM Final Localization
  43. GRB240122A: PRIME near infrared detection
  44. GRB 240123A: Glowbug gamma-ray detection
  45. GRB 240125A (short): Glowbug gamma-ray detection
  46. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  47. GRB 240123A: GRBAlpha detection
  48. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  49. GRB 240123A: Mondy continued optical observations and the PL decay index
  50. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  51. GRB 240123A: Enhanced Swift-XRT position
  52. GRB 240122A: Swift/UVOT Upper Limits
  53. GRB 240123A: Swift-XRT refined Analysis
  54. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  55. Fermi GBM Sub-Threshold Detection of GRB 240123A
  56. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  57. GRB 240123B: Fermi GBM Final Real-time Localization
  58. GRB 240118A: Swift/UVOT Upper Limits
  59. GRB 240122B: Glowbug gamma-ray detection
  60. GRB 240123A: Mondy optical afterglow observations
  61. IceCube-240123A - IceCube observation of a high-energy neutrino candidate track-like event
  62. Konus-Wind detection of GRB 240112A
  63. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  64. GRB 240122A: Swift-XRT afterglow detection
  65. GRB 240122A: VLT/X-shooter redshift confirmation
  66. GRB 240122A: Redshift from OSIRIS+/GTC
  67. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  68. GRB 240122A: Tiled Swift observations
  69. Konus-Wind detection of GRB 240119A (short/hard)
  70. GRB 240122A: MAXI/GSC detection
  71. IPN triangulation of GRB 240119A (short)
  72. GRB 240119A: GECAM detection of a short burst
  73. GRB 240118C: GECAM-B detection of a long burst
  74. GRB 240119A: AstroSat CZTI detection of a short burst
  75. GRB 240118A: Mondy optical observations
  76. GRB 240118A: Swift-XRT afterglow detection
  77. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  78. GRB 240119A: Fermi GBM Final Localization
  79. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  80. GRB 240118C: Swift/BAT-GUANO detection of a burst
  81. GRB 240118A: GRBAlpha detection
  82. GRB 240118D: AstroSat CZTI detection
  83. GRB 240117A: AstroSat CZTI detection
  84. GRB 240118A: Swift ToO observations
  85. GRB 240117A: Glowbug gamma-ray detection
  86. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  87. Konus-Wind detection of GRB 240118A
  88. GRB 240118A: NuSTAR Detection of a Long GRB
  89. GRB 240118B: Fermi GBM Final Real-time Localization
  90. GRB 240118A: Fermi-LAT detection
  91. GRID detection of GRB 231230A
  92. GRB 240118A: Fermi GBM Final Real-time Localization
  93. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  94. IPN triangulation of GRB 240112A (long)
  95. GRB 240115B: AstroSat CZTI detection
  96. GRB 240115B: Fermi GBM Detection
  97. IceCube-240105A: ZTF optical observation of blazar PKS 0446+11
  98. GRB 240112D: Glowbug gamma-ray detection
  99. GRB 240112C: Glowbug gamma-ray detection
  100. GRB 240112C: VZLUSAT-2 detection

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