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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"

28129 results found.

  1. GRB 220521A: RATIR Optical and NIR Observations
  2. GRB 220521A: Swift-XRT refined Analysis
  3. GRB 220521A: Swift/UVOT Upper Limits
  4. GRB 220521A: SAO RAS optical observations
  5. GRB 220521A: Enhanced Swift-XRT position
  6. GRB 220521A: NOT optical afterglow detection
  7. GRB 220521A: Swift detection of a burst
  8. Swift BAT Trigger 1107209 is not an astrophysical event
  9. GRB 220518A: Swift-BAT refined analysis
  10. GRB 220518A: Swift-XRT refined Analysis
  11. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  12. GRB 220518A: Swift/UVOT Detection
  13. GRB 220518A: Enhanced Swift-XRT position
  14. GRB 220518A: Swift detection of a burst
  15. GRB 220514A: MITSuME Akeno optical observation
  16. GRB 220514A: GRANDMA Optical Afterglow Observations
  17. Konus-Wind detection of GRB 220506A
  18. Konus-Wind detection of GRB 220514B
  19. GRB 220514A: Fermi GBM observation
  20. GRB 220514B: Swift-XRT observations
  21. GRB 220511A: Swift-XRT afterglow detection
  22. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  23. IceCube-220513A: Upper limits from a search for additional neutrino events in IceCube
  24. IceCube-220513A: No significant detection in HAWC
  25. GRB 220514B: MAXI/GSC detection
  26. MAXI GRB220514.98: Global MASTER-Net observations report
  27. GRB 220514A: MeerLICHT optical afterglow candidate
  28. GRB 220514A: BALROG localization (Fermi Trigger 674223877 / GRB 220514517)
  29. Konus-Wind detection of GRB 220511A
  30. IceCube-220509A: No significant detection in HAWC
  31. GRB 220511A: Fermi GBM observation
  32. GRB 220511A: Swift-XRT observations
  33. GRB 220511A: Swift/BAT-GUANO arcminute localization
  34. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  35. GRB 220511A: BALROG localization (Fermi Trigger 673969321/ GRB 220511571)
  36. GRB 220507A: AstroSat CZTI detection
  37. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  38. Fermi trigger No 673846271: Global MASTER-Net observations report
  39. GRB 220506A: MITSuME Akeno optical upper limits
  40. GRB 220506A: GIT optical upper limit.
  41. Swift-BAT triggers 1105560-1 are not GRBs
  42. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  43. MAXI GRB220506.27: Global MASTER-Net observations report
  44. GRB 220430A: Nanshan/NEXT optical upper limit
  45. GRB 220430A: Nanshan/HMT optical upper limit
  46. GRB 220430A: GIT optical upper limits
  47. IPN triangulation of GRB 220423A
  48. GRB 220427A: LCO Optical Observations
  49. IceCube-220501A: Upper limits from a search for additional neutrino events in IceCube
  50. GRB 220501A: Swift-BAT refined analysis
  51. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  52. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  53. GRB 220501A: BOOTES-1 optical upper limit
  54. GRB 220501A: Fermi GBM observation
  55. GRB 220430A: AstroSat CZTI detection
  56. GRB 220501A: Fermi GBM Final Real-time Localization
  57. GRB 220430A: Swift-BAT refined analysis
  58. GRB 220430A: Swift-XRT refined Analysis
  59. GRB 220430A: Mondy and AbAO optical upper limits
  60. GRB 220430A: MeerLICHT optical upper limits
  61. GRB 220430A: Enhanced Swift-XRT position
  62. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  63. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  64. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  65. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  66. GRB 220427A: Swift-BAT refined analysis
  67. GRB 220427A: VLT/X-shooter photometry
  68. GRB 220426A: Swift-XRT and UVOT observations
  69. GRB 220423A: Detection by VZLUSAT-2
  70. GRB 220427A: Swift-XRT refined Analysis
  71. GRB 220427A: Enhanced Swift-XRT position
  72. GRB 220427A: Swift detection of a burst with an optical counterpart
  73. IPN triangulation of GRB 220426A
  74. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  75. GRB 220426A: Fermi GBM detection
  76. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  77. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  78. GRB 220426A: BALROG localization (Fermi Trigger 672648596/ GRB 220426285)
  79. Correction to 31937: GRB 220421B: Detection by VZLUSAT-2
  80. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  81. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  82. GRB 220421B: Detection by VZLUSAT-2
  83. GRB 220421A: Fermi GBM observation
  84. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  85. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  86. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  87. GRB 220403C: Further Swift-XRT observations
  88. GRB 220417A: Fermi GBM detection
  89. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  90. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  91. GRB 220412B: Swift/UVOT Upper Limits
  92. Fermi trigger No 671729344: Global MASTER-Net observations report
  93. GRB 220412B: Swift-BAT refined analysis
  94. GRB 220408B: Fermi GBM observation
  95. GRB 220412B: TNG optical observations
  96. GRB 220412A: GRANDMA observations
  97. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  98. GRB 220412B: BOOTES-1 optical upper limit
  99. GRB 220412A: Swift-BAT refined analysis
  100. GRB 220412A: RATIR Observations of the Fading Afterglow

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