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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"

27921 results found.

  1. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  2. GRB 220427A: Swift-BAT refined analysis
  3. GRB 220426A: Swift-XRT and UVOT observations
  4. GRB 220423A: Detection by VZLUSAT-2
  5. Konus-Wind detection of GRB 220427A
  6. GRB 220427A: Swift-XRT refined Analysis
  7. GRB 220427A: Enhanced Swift-XRT position
  8. GRB 220426A: Tiled Swift observations
  9. GRB 220427A: Swift detection of a burst with an optical counterpart
  10. Konus-Wind detection of GRB 220426A
  11. IPN triangulation of GRB 220426A
  12. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  13. GRB 220426A: Fermi GBM detection
  14. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  15. GRB 220426B: Fermi GBM Final Real-time Localization
  16. Correction to 31937: GRB 220421B: Detection by VZLUSAT-2
  17. IceCube-220425A: MASTER: flaring blazar TXS 1742-078 as the possible neutrino source candidate
  18. IceCube-220425A - IceCube observation of a high-energy neutrino candidate track-like event
  19. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  20. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  21. On the AGILE detection of GRB 220423A
  22. GRB 220423A: AGILE detection
  23. GRB 220421B: Detection by VZLUSAT-2
  24. GRB 220421A: Fermi GBM observation
  25. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  26. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  27. GRB 220418B: Swift-XRT observations
  28. GRB 220418B Fermi GBM observation
  29. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  30. GRB 220403C: Further Swift-XRT observations
  31. GRB 220418B: Swift ToO observations
  32. GRB 220417A: Fermi GBM detection
  33. GRB 220418B: Swift/BAT-GUANO refined location of a short burst
  34. IPN triangulation of GRB 220411A
  35. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  36. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  37. GRB 220412B: Swift/UVOT Upper Limits
  38. GRB 220418B: Fermi GBM Final Real-time Localization
  39. GRB 220418A: Fermi GBM Final Real-time Localization
  40. GRB 220417A: Fermi GBM Final Real-time Localization
  41. GRB 220412B: Swift-BAT refined analysis
  42. Konus-Wind detection of GRB 220412B
  43. GRB 220412B: Fermi GBM observation
  44. Konus-Wind detection of GRB 220403C
  45. Konus-Wind detection of GRB 220408B
  46. GRB 220412A: GRANDMA observations
  47. GRB 220412A: BOOTES-network optical upper limits
  48. GRB 220412B: BOOTES-1 optical upper limit
  49. GRB 220412A: Swift-BAT refined analysis
  50. GRB 220412B: Swift-XRT observations
  51. GRB 220408B: Fermi-LAT detection
  52. IPN triangulation of short/soft GRB 220406A
  53. Swift GRB 220412B: Global MASTER-Net observations report
  54. GRB 220408A: HCT optical upper limit
  55. GRB 220412B: GIT optical upper limit
  56. GRB 220412A: MITSuME Akeno optical upper limits
  57. Correction to GCN 31888: GRB 220412A: Swift-XRT refined Analysis
  58. GRB 220412B: MITSuME Akeno optical upper limits
  59. GRB 220412A: Swift-XRT refined Analysis
  60. GRB 220412A: Enhanced Swift-XRT position
  61. GRB 220412B: Swift detection of a short burst
  62. GRB 220412A: Swift/UVOT Upper Limits
  63. GRB 220408A: GRANDMA observations
  64. GRB 220412A: RATIR Afterglow Candidate
  65. GRB 220412A: Swift detection of a burst
  66. Swift GRB220412.28: Global MASTER-Net observations report
  67. GRB 220411A: AstroSat CZTI detection
  68. IPN triangulation of GRB 220408B
  69. IPN triangulation of GRB 220403C
  70. GRB 220403B: Swift/UVOT Detection
  71. GRB 220408A: Lowell Discovery Telescope Optical Observations
  72. GRB 220408A: Swift-BAT refined analysis
  73. GRB 220411A: Fermi GBM Final Real-time Localization
  74. GRB 220408A: RATIR Optical and NIR Observations
  75. GRB 220403B: 1.3m DFOT Optical upper limit
  76. GRB 220408A: 1.3m DFOT Optical upper limit
  77. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  78. GRB 220403C: Swift-XRT observations
  79. GRB 220408A: redshift lower limit estimating
  80. GRB 220408A: NOT optical observations and archival detection
  81. GRB 220408B: AstroSat CZTI detection
  82. GRB 220408A: LCO Optical Afterglow Detection
  83. GRB 220408A: Swift-XRT refined Analysis
  84. GRB 220403C: Swift ToO observations
  85. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  86. GRB 220408A: GIT optical upper limit
  87. GRB 220408A: Fermi GBM observation
  88. GRB 220408A: Swift/UVOT Detection
  89. GRB 220408B: Fermi GBM Final Localization
  90. GRB 220408A: Xinglong-2.16m optical upper limit
  91. GRB 220408A: Enhanced Swift-XRT position
  92. GRB 220408A: KAIT Optical Observations
  93. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  94. GRB 220408A: Fermi GBM Final Real-time Localization
  95. GRB 220403B: 1.5m OSN optical observation
  96. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  97. GRB 220404A: Swift-BAT refined analysis
  98. GRB 220405A: Fermi GBM Final Localization
  99. GRB 220403B: Swift-BAT refined analysis
  100. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event

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