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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"

11561 results found.

  1. GRB 240205B: GECAM detection of a long burst
  2. GRB 240205B: Skynet Optical Afterglow Observations
  3. GRB 240205B: BOOTES-7 optical afterglow follow-up
  4. Fermi trigger No 728749569: Global MASTER-Net observations report
  5. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  6. GRB 240205B: Fermi GBM Final Real-time Localization
  7. GRB 240204A: Fermi GBM Observation
  8. GRB 240205A: Fermi GBM Final Real-time Localization
  9. GRB 240204a: Liverpool Telescope optical afterglow detection
  10. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  11. Fermi Gamma-ray Burst Monitor trigger 728740048/240204491 is not a GRB
  12. Fermi trigger No 728796365: Global MASTER-Net observations report
  13. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  14. GRB 240204A: Montarrenti Observatory optical observations
  15. GRB 240204A: Mondy optical afterglow candidate
  16. Fermi Gamma-ray Burst Monitor trigger 728706420/240204102 is not a GRB
  17. Fermi GRB 240204A: Global MASTER-Net observations report
  18. Fermi trigger No 728706420: Global MASTER-Net observations report
  19. GRB 240204A: Swift detection of a burst
  20. IceCube-240204A - IceCube observation of a high-energy neutrino candidate track-like event
  21. GRB 240204A: Fermi GBM Final Real-time Localization
  22. GRB 230812B: Update on Bad Time Intervals for Fermi GBM data
  23. GRB 240129A: Fermi GBM Observation
  24. IPN triangulation of GRB 240125B (short)
  25. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  26. Fermi GRB 240127A: Global MASTER-Net observations report
  27. GRB 240127A: Fermi GBM Final Real-time Localization
  28. GRB 240125B: Fermi GBM Final Localization
  29. GRB 240123B: Fermi GBM Observation
  30. GRB 240123A: Glowbug gamma-ray detection
  31. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  32. GRB 240123A: GRBAlpha detection
  33. Fermi-LAT gamma-ray observations of IceCube-240123A
  34. Fermi/GBM trigger 727752941: BALROG analysis retraction
  35. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  36. Fermi GRB 240123B: Global MASTER-Net observations report
  37. Fermi GBM Sub-Threshold Detection of GRB 240123A
  38. GRB 240123B: Fermi GBM Final Real-time Localization
  39. IceCube-240123A - IceCube observation of a high-energy neutrino candidate track-like event
  40. Konus-Wind detection of GRB 240119A (short/hard)
  41. IPN triangulation of GRB 240119A (short)
  42. GRB 240119A: GECAM detection of a short burst
  43. GRB 240118C: GECAM-B detection of a long burst
  44. GRB 240119A: AstroSat CZTI detection of a short burst
  45. GRB 240118A: Mondy optical observations
  46. GRB 240118A: Swift-XRT afterglow detection
  47. GRB 240118C: Fermi GBM Observation
  48. Fermi GRB 240119A: Global MASTER-Net observations report
  49. GRB 240119A: Fermi GBM Final Localization
  50. GRB 240118C: Swift/BAT-GUANO detection of a burst
  51. GRB 240118A: GRBAlpha detection
  52. GRB 240115A: Fermi GBM Observation
  53. GRB 240118C: Fermi GBM Final Localization
  54. GRB 240118A: Swift ToO observations
  55. GRB 240118A: AbAO optical upper limit
  56. Fermi GRB 240118B: Global MASTER-Net observations report
  57. GRB 240118A: NuSTAR Offline Analysis of the GRB
  58. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  59. Konus-Wind detection of GRB 240118A
  60. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  61. GRB 240118A: NuSTAR Detection of a Long GRB
  62. GRB 240118A: Fermi GBM Observation
  63. GRB 240118B: Fermi GBM Final Real-time Localization
  64. GRB 240118A: Fermi-LAT detection
  65. GRID detection of GRB 231230A
  66. GRB 240118A: Fermi GBM Final Real-time Localization
  67. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  68. GRB 240115B: AstroSat CZTI detection
  69. GRB 240115B: Fermi GBM Detection
  70. GRB 240112D: Glowbug gamma-ray detection
  71. GRB 240112C: Glowbug gamma-ray detection
  72. GRB 240112C: VZLUSAT-2 detection
  73. GRB 240107A: VZLUSAT-2 detection
  74. Fermi GRB 240115B: Global MASTER-Net observations report
  75. GRB 240115B: A long GRB detected by INTEGRAL
  76. GRB 240115B: Fermi GBM Final Real-time Localization
  77. Konus-Wind detection of GRB 240112C
  78. Fermi GRB 240115A: Global MASTER-Net observations report
  79. GRB 240115A: Fermi GBM Final Real-time Localization
  80. GRB 240112C: GRBAlpha detection
  81. GRB 240112C: Fermi GBM Detection
  82. Fermi trigger No 726773850: Global MASTER-Net observations report
  83. GRB 240112E: Fermi GBM Final Localization
  84. Fermi GRB 240112D: Global MASTER-Net observations report
  85. GRB 240112D: Fermi GBM Final Real-time Localization
  86. Fermi trigger No 726774492: Global MASTER-Net observations report
  87. Fermi GRB 240112B: Global MASTER-Net observations report
  88. GRB 240112B: Fermi GBM Final Real-time Localization
  89. GRB 240109A: Fermi GBM Observation
  90. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  91. GRB 231214A: ATCA Radio Upper Limits
  92. GRB 240106B: Glowbug gamma-ray detection
  93. GRB 240106A: Glowbug gamma-ray detection
  94. GRB 240109B: Fermi GBM Final Real-time Localization
  95. Konus-Wind detection of GRB 240101C
  96. GRB 231215A: radio detection with the VLA
  97. GRB 230818A: further radio observations with the VLA
  98. GRB 230812B: further radio observations with the VLA
  99. Update of IceCube-240105A - Corrected errors
  100. GRB 240106A: GRBAlpha detection

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