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

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