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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"

14979 results found.

  1. Correction to 31937: GRB 220421B: Detection by VZLUSAT-2
  2. IceCube-220425A: MASTER: flaring blazar TXS 1742-078 as the possible neutrino source candidate
  3. IceCube-220425A - IceCube observation of a high-energy neutrino candidate track-like event
  4. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  5. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  6. On the AGILE detection of GRB 220423A
  7. GRB 220423A: AGILE detection
  8. GRB 220421B: Detection by VZLUSAT-2
  9. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  10. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  11. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  12. GRB 220417A: Fermi GBM detection
  13. IPN triangulation of GRB 220411A
  14. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  15. GRB 220418B: Fermi GBM Final Real-time Localization
  16. GRB 220418A: Fermi GBM Final Real-time Localization
  17. GRB 220417A: Fermi GBM Final Real-time Localization
  18. Konus-Wind detection of GRB 220412B
  19. Konus-Wind detection of GRB 220403C
  20. Konus-Wind detection of GRB 220408B
  21. GRB 220412A: BOOTES-network optical upper limits
  22. GRB 220412B: BOOTES-1 optical upper limit
  23. GRB 220408B: Fermi-LAT detection
  24. GRB 220412B: Swift detection of a short burst
  25. GRB 220412A: Swift detection of a burst
  26. GRB 220411A: AstroSat CZTI detection
  27. IPN triangulation of GRB 220408B
  28. IPN triangulation of GRB 220403C
  29. GRB 220403B: Swift/UVOT Detection
  30. GRB 220408A: Lowell Discovery Telescope Optical Observations
  31. GRB 220411A: Fermi GBM Final Real-time Localization
  32. GRB 220408A: RATIR Optical and NIR Observations
  33. GRB 220408A: 1.3m DFOT Optical upper limit
  34. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  35. GRB 220408A: NOT optical observations and archival detection
  36. GRB 220408B: AstroSat CZTI detection
  37. GRB 220408A: LCO Optical Afterglow Detection
  38. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  39. GRB 220408A: Swift/UVOT Detection
  40. GRB 220408B: Fermi GBM Final Localization
  41. GRB 220408A: KAIT Optical Observations
  42. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  43. GRB 220408A: Fermi GBM Final Real-time Localization
  44. GRB 220403B: 1.5m OSN optical observation
  45. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  46. GRB 220405A: Fermi GBM Final Localization
  47. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  48. GRB 220404B: Fermi GBM Final Real-time Localization
  49. GRB 220403B: Fermi GBM detection
  50. GRB 220404A: Swift detection of a burst
  51. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  52. GRB 220403B: optical detection by D50
  53. GRB 220403B: Swift detection of a burst with an optical counterpart
  54. GRB 220403A: Fermi GBM Final Real-time Localization
  55. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  56. Swift Trigger 1100848 is likely not a GRB
  57. GRB 220401B: Fermi GBM Final Real-time Localization
  58. GRB 220401A: Fermi GBM Final Localization
  59. GRB 220331A: Fermi GBM Final Real-time Localization
  60. GRB 220330A: Fermi GBM Final Real-time Localization
  61. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  62. GRB 220320A: Detection by VZLUSAT-2
  63. Konus-Wind observation of GRB 220320A
  64. GRB 211024B: Host galaxy redshift from X-shooter/VLT
  65. GRB 220326A: Fermi GBM Final Localization
  66. GRB 220325B: Fermi GBM Final Localization
  67. Fermi GBM Sub-Threshold Detection of GRB 220325A
  68. GRB 220324A: AstroSat CZTI detection
  69. GRB 220325A: Swift detection of a burst
  70. GRB 220323A: AstroSat CZTI detection
  71. GRB 220323A: AGILE/MCAL detection
  72. IPN triangulation of GRB 220320A
  73. GRB 220323A: Fermi GBM Final Real-time Localization
  74. GRB 220316A: AstroSat CZTI detection
  75. GRB 220320A: AstroSat CZTI detection
  76. GRB 220317A: Fermi GBM detection
  77. GRB 220321A: Fermi GBM Final Localization
  78. GRB 220319A: LCO Optical Upper Limit
  79. GRB 220319A: Swift detection of a burst
  80. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  81. GRB 220317A: Fermi GBM Final Real-time Localization
  82. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  83. GRB 220315A: Fermi GBM Final Real-time Localization
  84. IPN triangulation of GRB 220310A
  85. GRB 210722A: TAROT Reunion observatory optical light curve
  86. GRB 210222B: TAROT Reunion observatory optical light curve
  87. GRB 201021C: TAROT Reunion observatory optical light curve
  88. Konus-Wind detection of GRB 220310A
  89. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  90. Integral GRB220311.69: Global MASTER-Net OT detection
  91. GRB 220311A: Fermi GBM Final Real-time Localization
  92. GRB 220310C: Fermi GBM Final Real-time Localization
  93. Fermi GBM Detection of GRB 220308A
  94. GRB 220308A: AGILE detection
  95. GRB 220310A: MASTER optical counterpart detection
  96. GRB 220310A: CALET Gamma-Ray Burst Monitor detection
  97. GRB 220310B: Fermi GBM Final Real-time Localization
  98. GRB 220308B: Fermi GBM detection
  99. GRB 220310A: MAXI/GSC detection
  100. Konus-Wind detection of GRB 220308A

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