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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"

37733 results found.

  1. GRB 240205B: PRIME near infrared detection
  2. GRB 240205A (short): Glowbug gamma-ray detection
  3. GRB240204A: Swift/UVOT Upper Limits
  4. GRB 240205B: AstroSat CZTI detection
  5. Fermi trigger No 729012023: Global MASTER-Net observations report
  6. GRB 240205B: Swift-BAT refined analysis
  7. Konus-Wind detection of GRB 240205B (long / very soft)
  8. GRB 240207A: Fermi GBM Final Real-time Localization
  9. Konus-Wind detection of GRB 240125A
  10. GRB 240205B: VLT/X-shooter redshift
  11. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  12. GRB 240205B: BOOTES-6 optical afterglow follow-up
  13. GRB 240205B: ATCA detection of radio counterpart
  14. GRB 240205B: REM detection of the optical/NIR afterglow
  15. GRB 240205B: Fermi GBM Observation
  16. GRB 240204A: AstroSat CZTI detection
  17. GRB 240204A: Mondy optical afterglow observations
  18. GRB 240204A : OHP/T193/T120 optical afterglow fading detection
  19. GRB 240205B: GECAM detection of a long burst
  20. GRB 240204A: Swift-BAT refined analysis
  21. GRB 240205B: Skynet Optical Afterglow Observations
  22. GRB 240205B: BOOTES-7 optical afterglow follow-up
  23. Fermi trigger No 728749569: Global MASTER-Net observations report
  24. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  25. GRB 240205B: Swift detection of a burst
  26. GRB 240205B: Fermi GBM Final Real-time Localization
  27. GRB 240204A: Fermi GBM Observation
  28. GRB 240205A: Fermi GBM Final Real-time Localization
  29. GRB 240204a: Liverpool Telescope optical afterglow detection
  30. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  31. Fermi Gamma-ray Burst Monitor trigger 728740048/240204491 is not a GRB
  32. Fermi trigger No 728796365: Global MASTER-Net observations report
  33. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  34. GRB 240204A: Montarrenti Observatory optical observations
  35. GRB 240204A: Enhanced Swift-XRT position
  36. GRB 240204A: Mondy optical afterglow candidate
  37. Fermi Gamma-ray Burst Monitor trigger 728706420/240204102 is not a GRB
  38. Fermi GRB 240204A: Global MASTER-Net observations report
  39. Fermi trigger No 728706420: Global MASTER-Net observations report
  40. GRB 240204A: Swift detection of a burst
  41. IceCube-240204A - IceCube observation of a high-energy neutrino candidate track-like event
  42. GRB 240204A: Fermi GBM Final Real-time Localization
  43. GRB 230812B: Update on Bad Time Intervals for Fermi GBM data
  44. Konus-Wind detection of GRB 240124B
  45. Konus-Wind detection of GRB 240123C
  46. IPN triangulation of GRB 240124B
  47. GRB 240201A: AstroSat CZTI detection
  48. GRB 240129A: Fermi GBM Observation
  49. IPN triangulation of GRB 240125B (short)
  50. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  51. IPN triangulation of GRB 240125A (short)
  52. GRB 240128A: Glowbug gamma-ray detection
  53. GRB 240128A: Swift-XRT observations
  54. GRB 240128A: GRBAlpha detection
  55. GRB 240128A: Tiled Swift observations
  56. GRB 240128A: CALET Gamma-Ray Burst Monitor detection
  57. GRB 240128A: MAXI/GSC detection
  58. GRB 240125A: GRBAlpha detection
  59. Fermi GRB 240127A: Global MASTER-Net observations report
  60. GRB 240123C: GRBAlpha detection
  61. GRB 240122A: ATCA detection of radio counterpart
  62. GRB 240127A: Fermi GBM Final Real-time Localization
  63. GRB 240125A: CALET Gamma-Ray Burst Monitor detection
  64. GRB 240125A: AstroSat CZTI detection of a short burst
  65. GRB 240124B: AstroSat CZTI detection
  66. GRB 240123C: AstroSat CZTI detection
  67. GRB 240125B: Fermi GBM Final Localization
  68. GRB 240123B: Fermi GBM Observation
  69. GRB 240123A: Glowbug gamma-ray detection
  70. GRB 240125A (short): Glowbug gamma-ray detection
  71. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  72. GRB 240123A: GRBAlpha detection
  73. IPN triangulation of GRB 240123C (short)
  74. Fermi-LAT gamma-ray observations of IceCube-240123A
  75. GRB 240123A: further SAO RAS optical observations
  76. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  77. GRB 240123A: Swift-BAT refined analysis
  78. GRB 240123A: Mondy continued optical observations and the PL decay index
  79. GRB 240123A: SAO RAS optical observations
  80. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  81. Fermi/GBM trigger 727752941: BALROG analysis retraction
  82. GRB 240123A: Enhanced Swift-XRT position
  83. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  84. Fermi GRB 240123B: Global MASTER-Net observations report
  85. GRB 240122A: Swift/UVOT Upper Limits
  86. GRB 240123A: Swift-XRT refined Analysis
  87. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  88. Fermi GBM Sub-Threshold Detection of GRB 240123A
  89. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  90. GRB 240123B: Fermi GBM Final Real-time Localization
  91. GRB 240118A: Swift/UVOT Upper Limits
  92. GRB 240122B: Glowbug gamma-ray detection
  93. GRB 240123A: Mondy optical afterglow observations
  94. IceCube-240123A - IceCube observation of a high-energy neutrino candidate track-like event
  95. Konus-Wind detection of GRB 240112A
  96. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  97. GRB 240122A: Swift-XRT afterglow detection
  98. GRB 240122A: VLT/X-shooter redshift confirmation
  99. GRB 240122A: Redshift from OSIRIS+/GTC
  100. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading

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