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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"

28119 results found.

  1. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  2. GRB 220518A: Swift/UVOT Detection
  3. GRB 220518A: Enhanced Swift-XRT position
  4. GRB 220518A: Swift detection of a burst
  5. GRB 220514A: MITSuME Akeno optical observation
  6. GRB 220514A: GRANDMA Optical Afterglow Observations
  7. Konus-Wind detection of GRB 220506A
  8. Konus-Wind detection of GRB 220514B
  9. GRB 220514A: Fermi GBM observation
  10. GRB 220514B: Swift-XRT observations
  11. GRB 220511A: Swift-XRT afterglow detection
  12. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  13. IceCube-220513A: Upper limits from a search for additional neutrino events in IceCube
  14. IceCube-220513A: No significant detection in HAWC
  15. GRB 220514B: MAXI/GSC detection
  16. MAXI GRB220514.98: Global MASTER-Net observations report
  17. GRB 220514A: MeerLICHT optical afterglow candidate
  18. GRB 220514A: BALROG localization (Fermi Trigger 674223877 / GRB 220514517)
  19. Konus-Wind detection of GRB 220511A
  20. IceCube-220509A: No significant detection in HAWC
  21. GRB 220511A: Fermi GBM observation
  22. GRB 220511A: Swift-XRT observations
  23. GRB 220511A: Swift/BAT-GUANO arcminute localization
  24. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  25. GRB 220511A: BALROG localization (Fermi Trigger 673969321/ GRB 220511571)
  26. GRB 220507A: AstroSat CZTI detection
  27. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  28. Fermi trigger No 673846271: Global MASTER-Net observations report
  29. GRB 220506A: MITSuME Akeno optical upper limits
  30. GRB 220506A: GIT optical upper limit.
  31. Swift-BAT triggers 1105560-1 are not GRBs
  32. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  33. MAXI GRB220506.27: Global MASTER-Net observations report
  34. GRB 220430A: Nanshan/NEXT optical upper limit
  35. GRB 220430A: Nanshan/HMT optical upper limit
  36. GRB 220430A: GIT optical upper limits
  37. IPN triangulation of GRB 220423A
  38. GRB 220427A: LCO Optical Observations
  39. IceCube-220501A: Upper limits from a search for additional neutrino events in IceCube
  40. GRB 220501A: Swift-BAT refined analysis
  41. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  42. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  43. GRB 220501A: BOOTES-1 optical upper limit
  44. GRB 220501A: Fermi GBM observation
  45. GRB 220430A: AstroSat CZTI detection
  46. GRB 220501A: Fermi GBM Final Real-time Localization
  47. GRB 220430A: Swift-BAT refined analysis
  48. GRB 220430A: Swift-XRT refined Analysis
  49. GRB 220430A: Mondy and AbAO optical upper limits
  50. GRB 220430A: MeerLICHT optical upper limits
  51. GRB 220430A: Enhanced Swift-XRT position
  52. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  53. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  54. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  55. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  56. GRB 220427A: Swift-BAT refined analysis
  57. GRB 220427A: VLT/X-shooter photometry
  58. GRB 220426A: Swift-XRT and UVOT observations
  59. GRB 220423A: Detection by VZLUSAT-2
  60. GRB 220427A: Swift-XRT refined Analysis
  61. GRB 220427A: Enhanced Swift-XRT position
  62. GRB 220427A: Swift detection of a burst with an optical counterpart
  63. IPN triangulation of GRB 220426A
  64. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  65. GRB 220426A: Fermi GBM detection
  66. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  67. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  68. GRB 220426A: BALROG localization (Fermi Trigger 672648596/ GRB 220426285)
  69. Correction to 31937: GRB 220421B: Detection by VZLUSAT-2
  70. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  71. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  72. GRB 220421B: Detection by VZLUSAT-2
  73. GRB 220421A: Fermi GBM observation
  74. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  75. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  76. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  77. GRB 220403C: Further Swift-XRT observations
  78. GRB 220417A: Fermi GBM detection
  79. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  80. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  81. GRB 220412B: Swift/UVOT Upper Limits
  82. Fermi trigger No 671729344: Global MASTER-Net observations report
  83. GRB 220412B: Swift-BAT refined analysis
  84. GRB 220408B: Fermi GBM observation
  85. GRB 220412B: TNG optical observations
  86. GRB 220412A: GRANDMA observations
  87. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  88. GRB 220412B: BOOTES-1 optical upper limit
  89. GRB 220412A: Swift-BAT refined analysis
  90. GRB 220412A: RATIR Observations of the Fading Afterglow
  91. GRB 220412B: Swift-XRT observations
  92. IPN triangulation of short/soft GRB 220406A
  93. GRB 220412B: GIT optical upper limit
  94. GRB 220412A: MITSuME Akeno optical upper limits
  95. Correction to GCN 31888: GRB 220412A: Swift-XRT refined Analysis
  96. GRB 220412B: MITSuME Akeno optical upper limits
  97. GRB 220412A: Swift-XRT refined Analysis
  98. GRB 220412A: Enhanced Swift-XRT position
  99. GRB 220412B: Swift detection of a short burst
  100. GRB 220412A: Swift/UVOT Upper Limits

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