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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"

27924 results found.

  1. GRB 220405A: Fermi GBM Final Localization
  2. GRB 220403B: Swift-BAT refined analysis
  3. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  4. GRB 220404B: Fermi GBM Final Real-time Localization
  5. GRB 220403B: Fermi GBM detection
  6. GRB 220404A: Swift detection of a burst
  7. GRB 220403B: Swift-XRT refined Analysis
  8. Swift GRB 220403B: Global MASTER-Net observations report
  9. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  10. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  11. GRB 220403A: Tautenburg observations
  12. GRB 220403B: optical detection by D50
  13. GRB 220403B: Swift detection of a burst with an optical counterpart
  14. GRB 220403A: Fermi GBM Final Real-time Localization
  15. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  16. Swift Trigger 1100848 is likely not a GRB
  17. Swift GRB220402.16: Global MASTER-Net observations report
  18. GRB 220401B: Fermi GBM Final Real-time Localization
  19. GRB 220401A: Fermi GBM Final Localization
  20. GRB 220331A: Fermi GBM Final Real-time Localization
  21. GRB 220330A: Fermi GBM Final Real-time Localization
  22. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  23. GRB 220320A: Detection by VZLUSAT-2
  24. Konus-Wind observation of GRB 220320A
  25. GRB 220325A: Swift/UVOT Upper Limits
  26. GRB 211024B: Host galaxy redshift from X-shooter/VLT
  27. GRB 220325A: Swift-BAT refined analysis
  28. GRB 220326A: Fermi GBM Final Localization
  29. GRB 220325A: LCO Optical Upper Limits
  30. GRB 220325A: Swift-XRT refined Analysis
  31. GRB 220325A: 1.3m DFOT Optical upper limit
  32. GRB 220325B: Fermi GBM Final Localization
  33. Fermi GBM Sub-Threshold Detection of GRB 220325A
  34. GRB 220325A: Enhanced Swift-XRT position
  35. GRB 220325A: MASTER Global Robotic Net optical observations
  36. GRB 220324A: AstroSat CZTI detection
  37. GRB 220325A: Swift detection of a burst
  38. GRB 220323A: AstroSat CZTI detection
  39. GRB 220323A: AGILE/MCAL detection
  40. IPN triangulation of GRB 220320A
  41. GRB 220323A: Fermi GBM Final Real-time Localization
  42. GRB 220319A: Swift-BAT refined analysis
  43. GRB 220316A: AstroSat CZTI detection
  44. GRB 220320A: AstroSat CZTI detection
  45. GRB 220317A: Fermi GBM detection
  46. GRB 220321A: Fermi GBM Final Localization
  47. GRB 220319A: MITSuME Akeno optical upper limits
  48. GRB 220319A: LCO Optical Upper Limit
  49. GRB 220319A: Mondy optical uper limit
  50. GRB 220319A: Swift-XRT refined Analysis
  51. GRB 220319A: Enhanced Swift-XRT position
  52. GRB 220319A: MASTER Global Robotic Net optical observations
  53. GRB 220319A: Swift detection of a burst
  54. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  55. GRB 220317A: Fermi GBM Final Real-time Localization
  56. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  57. GRB 220306B: Swift/UVOT Upper Limits
  58. GRB 220315A: Fermi GBM Final Real-time Localization
  59. IPN triangulation of GRB 220310A
  60. GRB 220310C: Fermi GBM observation
  61. GRB 210722A: TAROT Reunion observatory optical light curve
  62. GRB 210222B: TAROT Reunion observatory optical light curve
  63. GRB 201021C: TAROT Reunion observatory optical light curve
  64. GRB 220310C: Swift-XRT observations
  65. Konus-Wind detection of GRB 220310A
  66. GRB 220310C: Swift ToO observations
  67. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  68. Integral GRB220311.69: Global MASTER-Net OT detection
  69. GRB 220311A: Fermi GBM Final Real-time Localization
  70. GRB 220306B: Nanshan/NEXT optical upper limit
  71. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  72. GRB 220310C: Fermi GBM Final Real-time Localization
  73. Fermi GBM Detection of GRB 220308A
  74. GRB 220308A: AGILE detection
  75. GRB 220310A: MASTER optical counterpart detection
  76. GRB 220310A: Swift ToO observations
  77. GRB 220310A: CALET Gamma-Ray Burst Monitor detection
  78. GRB 220310B: Fermi GBM Final Real-time Localization
  79. GRB 220308B: Fermi GBM detection
  80. GRB 220310A: MAXI/GSC detection
  81. Konus-Wind detection of GRB 220308A
  82. IceCube-220306A: No significant detection in HAWC
  83. IceCube-220303A: No significant detection in HAWC
  84. CALET Gamma-Ray Burst Monitor detection of GRB 220308A and its possible precursor
  85. GRB 220309A: Fermi GBM Final Real-time Localization
  86. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  87. IPN triangulation of GRB 220308A (long / very bright)
  88. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  89. GRB 220306B: Tautenburg observations
  90. GRB 220304A Fermi GBM detection
  91. GRB 220306B: Swift-BAT refined analysis
  92. GRB 220306B: AbAO optical observations, possible afterglow candidate
  93. GRB 220306B: BOOTES-1 optical upper limit
  94. GRB 220306B: Swift-XRT refined Analysis
  95. GRB 220306B: Fermi GBM observation
  96. GRB 220306B: Enhanced Swift-XRT position
  97. Swift GRB 220306B: Global MASTER-Net observations report
  98. GRB 220305A: Swift-BAT refined analysis
  99. GRB 220306B: Swift detection of a burst
  100. Fermi GBM Sub-Threshold Detection of GRB 220305A

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