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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"

11623 results found.

  1. Swift BAT Sub-Threshold Detection of EPW20240219aa
  2. GRB 240222A: GECAM detection of a burst
  3. GRB 240222A: Fermi GBM Observation
  4. Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB
  5. Fermi GRB 240222A: Global MASTER-Net observations report
  6. EPW20240219aa is Likely a GRB Event
  7. GRB 240222A: Fermi GBM Final Real-time Localization
  8. GRB 240216A: Glowbug gamma-ray detection
  9. GRB 240215B: Fermi GBM Observation
  10. GRB 240218A: LBT H-band detection
  11. Fermi GRB 240220A: Global MASTER-Net observations report
  12. GRB 240220A: Fermi GBM Final Real-time Localization
  13. Konus-Wind detection of GRB 240218A
  14. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  15. GRB 240218A: Fermi GBM Detection
  16. GRB 240215A: Fermi GBM Observation
  17. GRB 240216A: GRBAlpha detection
  18. GRB 240215B: GRBAlpha detection
  19. IPN triangulation of GRB 240209A
  20. Fermi trigger No 729914426: Global MASTER-Net observations report
  21. Gamma-ray flaring activity from the blazar 1ES 1959+650 observed by the Fermi-LAT
  22. GRB 240213A: GRBAlpha detection
  23. GRB 240215C: Fermi GBM Final Real-time Localization
  24. GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  25. Fermi GRB 240216A: Global MASTER-Net observations report
  26. GRB 240216A: Fermi GBM Final Real-time Localization
  27. Fermi trigger No 729719508: Global MASTER-Net observations report
  28. GRB 240215A: Swift/BAT-GUANO localization of a burst
  29. Fermi trigger No 729703985: Global MASTER-Net observations report
  30. Fermi trigger No 729650855: Global MASTER-Net observations report
  31. GRB 240209A: Classification of AT2024cew/GOTO24pw as Type Ia-pec supernova
  32. GRB 240209A: Fermi GBM observation
  33. GRB 240213A: Glowbug gamma-ray detection
  34. GRB240209A: OHP/T193 detection of the GOTO afterglow candidate AT2024cew / GOTO24pw
  35. GRB 240209A: Wendelstein Optical Observations
  36. GRB 240213A: BALROG localization (Fermi Trigger / GRB 240213841)
  37. Fermi GRB 240213A: Global MASTER-Net observations report
  38. GRB 240213A: Fermi GBM Final Real-time Localization
  39. GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
  40. GRB 240209A: NOT photometry of the AT2024cew / GOTO24pw counterpart candidate
  41. GRB 240209A: GOTO optical counterpart candidate
  42. Konus-Wind detection of GRB 240204A
  43. Konus-Wind detection of GRB 240205A (short)
  44. GRB 240209A: Fermi GBM Final Localization
  45. Fermi trigger No 729152364: Global MASTER-Net observations report
  46. IPN triangulation of GRB 240205A (short)
  47. Fermi-LAT gamma-ray observations of IceCube-240204A
  48. GRB 240205B: PRIME near infrared detection
  49. GRB 240205A (short): Glowbug gamma-ray detection
  50. GRB 240205B: AstroSat CZTI detection
  51. Fermi trigger No 729012023: Global MASTER-Net observations report
  52. Konus-Wind detection of GRB 240205B (long / very soft)
  53. GRB 240207A: Fermi GBM Final Real-time Localization
  54. GRB 240205B: VLT/X-shooter redshift
  55. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  56. GRB 240205B: BOOTES-6 optical afterglow follow-up
  57. GRB 240205B: ATCA detection of radio counterpart
  58. GRB 240205B: REM detection of the optical/NIR afterglow
  59. GRB 240205B: Fermi GBM Observation
  60. GRB 240204A: AstroSat CZTI detection
  61. GRB 240204A: Mondy optical afterglow observations
  62. GRB 240204A : OHP/T193/T120 optical afterglow fading detection
  63. GRB 240205B: GECAM detection of a long burst
  64. GRB 240205B: Skynet Optical Afterglow Observations
  65. GRB 240205B: BOOTES-7 optical afterglow follow-up
  66. Fermi trigger No 728749569: Global MASTER-Net observations report
  67. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  68. GRB 240205B: Fermi GBM Final Real-time Localization
  69. GRB 240204A: Fermi GBM Observation
  70. GRB 240205A: Fermi GBM Final Real-time Localization
  71. GRB 240204a: Liverpool Telescope optical afterglow detection
  72. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  73. Fermi Gamma-ray Burst Monitor trigger 728740048/240204491 is not a GRB
  74. Fermi trigger No 728796365: Global MASTER-Net observations report
  75. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  76. GRB 240204A: Montarrenti Observatory optical observations
  77. GRB 240204A: Mondy optical afterglow candidate
  78. Fermi Gamma-ray Burst Monitor trigger 728706420/240204102 is not a GRB
  79. Fermi GRB 240204A: Global MASTER-Net observations report
  80. Fermi trigger No 728706420: Global MASTER-Net observations report
  81. GRB 240204A: Swift detection of a burst
  82. IceCube-240204A - IceCube observation of a high-energy neutrino candidate track-like event
  83. GRB 240204A: Fermi GBM Final Real-time Localization
  84. GRB 230812B: Update on Bad Time Intervals for Fermi GBM data
  85. GRB 240129A: Fermi GBM Observation
  86. IPN triangulation of GRB 240125B (short)
  87. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  88. Fermi GRB 240127A: Global MASTER-Net observations report
  89. GRB 240127A: Fermi GBM Final Real-time Localization
  90. GRB 240125B: Fermi GBM Final Localization
  91. GRB 240123B: Fermi GBM Observation
  92. GRB 240123A: Glowbug gamma-ray detection
  93. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  94. GRB 240123A: GRBAlpha detection
  95. Fermi-LAT gamma-ray observations of IceCube-240123A
  96. Fermi/GBM trigger 727752941: BALROG analysis retraction
  97. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  98. Fermi GRB 240123B: Global MASTER-Net observations report
  99. Fermi GBM Sub-Threshold Detection of GRB 240123A
  100. GRB 240123B: Fermi GBM Final Real-time Localization

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