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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"

39340 results found.

  1. GRB 240213A: BALROG localization (Fermi Trigger / GRB 240213841)
  2. Fermi GRB 240213A: Global MASTER-Net observations report
  3. GRB 240213A: Fermi GBM Final Real-time Localization
  4. GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
  5. GRB 240209A: NOT photometry of the AT2024cew / GOTO24pw counterpart candidate
  6. GRB 240209A: GOTO optical counterpart candidate
  7. Konus-Wind detection of GRB 240204A
  8. Konus-Wind detection of GRB 240205A (short)
  9. GRB 240209A: Fermi GBM Final Localization
  10. Fermi trigger No 729152364: Global MASTER-Net observations report
  11. IPN triangulation of GRB 240205A (short)
  12. Fermi-LAT gamma-ray observations of IceCube-240204A
  13. GRB 240205B: PRIME near infrared detection
  14. GRB 240205A (short): Glowbug gamma-ray detection
  15. GRB240204A: Swift/UVOT Upper Limits
  16. GRB 240205B: AstroSat CZTI detection
  17. Fermi trigger No 729012023: Global MASTER-Net observations report
  18. GRB 240205B: Swift-BAT refined analysis
  19. Konus-Wind detection of GRB 240205B (long / very soft)
  20. GRB 240207A: Fermi GBM Final Real-time Localization
  21. Konus-Wind detection of GRB 240125A
  22. GRB 240205B: VLT/X-shooter redshift
  23. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  24. GRB 240205B: BOOTES-6 optical afterglow follow-up
  25. GRB 240205B: ATCA detection of radio counterpart
  26. GRB 240205B: REM detection of the optical/NIR afterglow
  27. GRB 240205B: Fermi GBM Observation
  28. GRB 240204A: AstroSat CZTI detection
  29. GRB 240204A: Mondy optical afterglow observations
  30. GRB 240204A : OHP/T193/T120 optical afterglow fading detection
  31. GRB 240205B: GECAM detection of a long burst
  32. GRB 240204A: Swift-BAT refined analysis
  33. GRB 240205B: Skynet Optical Afterglow Observations
  34. GRB 240205B: BOOTES-7 optical afterglow follow-up
  35. Fermi trigger No 728749569: Global MASTER-Net observations report
  36. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  37. GRB 240205B: Swift detection of a burst
  38. GRB 240205B: Fermi GBM Final Real-time Localization
  39. Swift GRB240205.93: Global MASTER-Net observations report
  40. GRB 240204A: Fermi GBM Observation
  41. GRB 240205A: Fermi GBM Final Real-time Localization
  42. GRB 240204a: Liverpool Telescope optical afterglow detection
  43. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  44. Fermi Gamma-ray Burst Monitor trigger 728740048/240204491 is not a GRB
  45. Fermi trigger No 728796365: Global MASTER-Net observations report
  46. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  47. GRB 240204A: Montarrenti Observatory optical observations
  48. GRB 240204A: Enhanced Swift-XRT position
  49. GRB 240204A: Mondy optical afterglow candidate
  50. Fermi Gamma-ray Burst Monitor trigger 728706420/240204102 is not a GRB
  51. Fermi GRB 240204A: Global MASTER-Net observations report
  52. Fermi trigger No 728706420: Global MASTER-Net observations report
  53. GRB 240204A: Swift detection of a burst
  54. GRB 240204A: Fermi GBM Final Real-time Localization
  55. IceCube Alert 240204.38: Global MASTER-Net observations report
  56. GRB 230812B: Update on Bad Time Intervals for Fermi GBM data
  57. Konus-Wind detection of GRB 240124B
  58. Konus-Wind detection of GRB 240123C
  59. IPN triangulation of GRB 240124B
  60. GRB 240201A: AstroSat CZTI detection
  61. GRB 240129A: Fermi GBM Observation
  62. IPN triangulation of GRB 240125B (short)
  63. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  64. IPN triangulation of GRB 240125A (short)
  65. GRB 240128A: Glowbug gamma-ray detection
  66. GRB 240128A: Swift-XRT observations
  67. GRB 240128A: GRBAlpha detection
  68. GRB 240128A: Tiled Swift observations
  69. GRB 240128A: CALET Gamma-Ray Burst Monitor detection
  70. GRB 240128A: MAXI/GSC detection
  71. GRB 240125A: GRBAlpha detection
  72. Fermi GRB 240127A: Global MASTER-Net observations report
  73. GRB 240123C: GRBAlpha detection
  74. GRB 240122A: ATCA detection of radio counterpart
  75. GRB 240127A: Fermi GBM Final Real-time Localization
  76. GRB 240125A: CALET Gamma-Ray Burst Monitor detection
  77. GRB 240125A: AstroSat CZTI detection of a short burst
  78. GRB 240124B: AstroSat CZTI detection
  79. GRB 240123C: AstroSat CZTI detection
  80. GRB 240125B: Fermi GBM Final Localization
  81. GRB240122A: PRIME near infrared detection
  82. GRB 240123B: Fermi GBM Observation
  83. GRB 240123A: Glowbug gamma-ray detection
  84. GRB 240125A (short): Glowbug gamma-ray detection
  85. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  86. GRB 240123A: GRBAlpha detection
  87. IPN triangulation of GRB 240123C (short)
  88. GRB 240123A: further SAO RAS optical observations
  89. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  90. GRB 240123A: Swift-BAT refined analysis
  91. IceCube Alert 240123.48: Global MASTER-Net observations report
  92. GRB 240123A: Mondy continued optical observations and the PL decay index
  93. GRB 240123A: SAO RAS optical observations
  94. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  95. Fermi/GBM trigger 727752941: BALROG analysis retraction
  96. GRB 240123A: Enhanced Swift-XRT position
  97. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  98. Fermi GRB 240123B: Global MASTER-Net observations report
  99. GRB 240122A: Swift/UVOT Upper Limits
  100. GRB 240123A: Swift-XRT refined Analysis

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