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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"

28231 results found.

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

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