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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"

37718 results found.

  1. GRB 240204A: AstroSat CZTI detection
  2. GRB 240204A: Mondy optical afterglow observations
  3. GRB 240204A : OHP/T193/T120 optical afterglow fading detection
  4. GRB 240205B: GECAM detection of a long burst
  5. GRB 240204A: Swift-BAT refined analysis
  6. GRB 240205B: Skynet Optical Afterglow Observations
  7. GRB 240205B: BOOTES-7 optical afterglow follow-up
  8. Fermi trigger No 728749569: Global MASTER-Net observations report
  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: Osservatorio Astronomico Nastro Verde upper limit
  16. Fermi Gamma-ray Burst Monitor trigger 728740048/240204491 is not a GRB
  17. Fermi trigger No 728796365: Global MASTER-Net observations report
  18. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  19. GRB 240204A: Montarrenti Observatory optical observations
  20. GRB 240204A: Enhanced Swift-XRT position
  21. GRB 240204A: Mondy optical afterglow candidate
  22. Fermi Gamma-ray Burst Monitor trigger 728706420/240204102 is not a GRB
  23. Fermi GRB 240204A: Global MASTER-Net observations report
  24. Fermi trigger No 728706420: Global MASTER-Net observations report
  25. GRB 240204A: Swift detection of a burst
  26. IceCube-240204A - IceCube observation of a high-energy neutrino candidate track-like event
  27. GRB 240204A: Fermi GBM Final Real-time Localization
  28. GRB 230812B: Update on Bad Time Intervals for Fermi GBM data
  29. Konus-Wind detection of GRB 240124B
  30. Konus-Wind detection of GRB 240123C
  31. IPN triangulation of GRB 240124B
  32. GRB 240201A: AstroSat CZTI detection
  33. GRB 240129A: Fermi GBM Observation
  34. IPN triangulation of GRB 240125B (short)
  35. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  36. IPN triangulation of GRB 240125A (short)
  37. GRB 240128A: Glowbug gamma-ray detection
  38. GRB 240128A: Swift-XRT observations
  39. GRB 240128A: GRBAlpha detection
  40. GRB 240128A: Tiled Swift observations
  41. GRB 240128A: CALET Gamma-Ray Burst Monitor detection
  42. GRB 240128A: MAXI/GSC detection
  43. GRB 240125A: GRBAlpha detection
  44. Fermi GRB 240127A: Global MASTER-Net observations report
  45. GRB 240123C: GRBAlpha detection
  46. GRB 240122A: ATCA detection of radio counterpart
  47. GRB 240127A: Fermi GBM Final Real-time Localization
  48. GRB 240125A: CALET Gamma-Ray Burst Monitor detection
  49. GRB 240125A: AstroSat CZTI detection of a short burst
  50. GRB 240124B: AstroSat CZTI detection
  51. GRB 240123C: AstroSat CZTI detection
  52. GRB 240125B: Fermi GBM Final Localization
  53. GRB 240123B: Fermi GBM Observation
  54. GRB 240123A: Glowbug gamma-ray detection
  55. GRB 240125A (short): Glowbug gamma-ray detection
  56. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  57. GRB 240123A: GRBAlpha detection
  58. IPN triangulation of GRB 240123C (short)
  59. Fermi-LAT gamma-ray observations of IceCube-240123A
  60. GRB 240123A: further SAO RAS optical observations
  61. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  62. GRB 240123A: Swift-BAT refined analysis
  63. GRB 240123A: Mondy continued optical observations and the PL decay index
  64. GRB 240123A: SAO RAS optical observations
  65. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  66. Fermi/GBM trigger 727752941: BALROG analysis retraction
  67. GRB 240123A: Enhanced Swift-XRT position
  68. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  69. Fermi GRB 240123B: Global MASTER-Net observations report
  70. GRB 240122A: Swift/UVOT Upper Limits
  71. GRB 240123A: Swift-XRT refined Analysis
  72. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  73. Fermi GBM Sub-Threshold Detection of GRB 240123A
  74. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  75. GRB 240123B: Fermi GBM Final Real-time Localization
  76. GRB 240118A: Swift/UVOT Upper Limits
  77. GRB 240122B: Glowbug gamma-ray detection
  78. GRB 240123A: Mondy optical afterglow observations
  79. IceCube-240123A - IceCube observation of a high-energy neutrino candidate track-like event
  80. Konus-Wind detection of GRB 240112A
  81. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  82. GRB 240122A: Swift-XRT afterglow detection
  83. GRB 240122A: VLT/X-shooter redshift confirmation
  84. GRB 240122A: Redshift from OSIRIS+/GTC
  85. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  86. GRB 240122A: GOTO optical counterpart candidate
  87. GRB 240122A: Tiled Swift observations
  88. Konus-Wind detection of GRB 240119A (short/hard)
  89. GRB 240122A: MAXI/GSC detection
  90. IPN triangulation of GRB 240119A (short)
  91. GRB 240119A: GECAM detection of a short burst
  92. GRB 240118C: GECAM-B detection of a long burst
  93. GRB 240119A: AstroSat CZTI detection of a short burst
  94. GRB 240118A: Mondy optical observations
  95. GRB 240118A: Swift-XRT afterglow detection
  96. GRB 240118C: Fermi GBM Observation
  97. Fermi GRB 240119A: Global MASTER-Net observations report
  98. GRB 240119A: Fermi GBM Final Localization
  99. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  100. GRB 240118C: Swift/BAT-GUANO detection of a burst

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