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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"

26119 results found.

  1. GRB 220527A: Swift/UVOT detection
  2. GRB 220527A: Swift-XRT afterglow detection
  3. Swift trigger 1108208 is not an interesting astrophysical event.
  4. GRB 220527A: Swift ToO observations
  5. Swift GRB220526.48: Global MASTER-Net observations report
  6. IPN triangulation of GRB 220524A
  7. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  8. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  9. GRB 220521A: ISON-Castelgrande observatory optical observations
  10. GRB 220521A: MITSuME Akeno optical upper limits
  11. GRB 220521A: Gemini Observations
  12. GRB 220521A: MMT Afterglow Imaging
  13. GRB 220521A: REM optical/NIR upper limits
  14. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  15. GRB 220521A: LCO Optical Detection
  16. GRB 220521A: Swift-BAT refined analysis
  17. GRB 220521A: Fermi GBM detection
  18. GRB 220521A: Sintesz-Newton/CrAO optical upper limit
  19. GRB 220521A: RATIR Optical and NIR Observations
  20. GRB 220521A: Swift-XRT refined Analysis
  21. GRB 220521A: Swift/UVOT Upper Limits
  22. GRB 220521A: Enhanced Swift-XRT position
  23. GRB 220521A: NOT optical afterglow detection
  24. GRB 220521A: Prompt enhanced Swift-XRT position
  25. GRB 220521A: Swift detection of a burst
  26. Swift GRB220521.97: Global MASTER-Net observations report
  27. Swift BAT Trigger 1107209 is not an astrophysical event
  28. GRB 220518A: Swift-BAT refined analysis
  29. Swift GRB220519.84: Global MASTER-Net observations report
  30. GRB 220518A: Swift-XRT refined Analysis
  31. GRB 220518A: Swift/UVOT Detection
  32. GRB 220518A: Enhanced Swift-XRT position
  33. Swift GRB 220518A: Global MASTER-Net observations report
  34. GRB 220518A: Swift detection of a burst
  35. GRB 220514A: MITSuME Akeno optical observation
  36. GRB 220514A: GRANDMA Optical Afterglow Observations
  37. GRB 220514B: Swift-XRT observations
  38. GRB 220511A: Swift-XRT afterglow detection
  39. GRB 220514A: KAIT Optical Afterglow Confirmation
  40. GRB 220514B: Tiled Swift observations
  41. GRB 220514A: MeerLICHT optical afterglow candidate
  42. GRB 220427A: MeerLICHT afterglow observations
  43. GRB 220511A: Fermi GBM observation
  44. GRB 220511A: Swift-XRT observations
  45. GRB 220511A: AstroSat CZTI detection
  46. GRB 220511A: BOOTES-2/TELMA optical upper limit
  47. GRB 220511A: Swift ToO observations
  48. GRB 220511A: Swift/BAT-GUANO arcminute localization
  49. GRB 220506A: MITSuME Akeno optical upper limits
  50. GRB 220506A: GIT optical upper limit.
  51. GRB 220506A: BOOTES-5/JGT optical upper limit
  52. GRB 220506A: Swift-XRT afterglow detection
  53. GRB 220506A: Tiled Swift observations
  54. Swift-BAT triggers 1105560-1 are not GRBs
  55. Swift GRB220506.51: Global MASTER-Net observations report
  56. GRB 220430A: Nanshan/NEXT optical upper limit
  57. GRB 220430A: Nanshan/HMT optical upper limit
  58. GRB 220430A: GIT optical upper limits
  59. IPN triangulation of GRB 220423A
  60. GRB 220427A: LCO Optical Observations
  61. GRB 220501A: Swift-BAT refined analysis
  62. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  63. GRB 220501A: BOOTES-1 optical upper limit
  64. GRB 220501A: Fermi GBM observation
  65. GRB 220430A: AstroSat CZTI detection
  66. GRB 220501A: Swift detection of a burst
  67. GRB 220430A: Swift-BAT refined analysis
  68. GRB 220430A: CAHA 2.2m telescope optical limit
  69. GRB 220430A: Swift-XRT refined Analysis
  70. Swift GRB 220430A: Global MASTER-Net observations report
  71. GRB 220430A: GRANDMA observations
  72. GRB 220430A: Mondy and AbAO optical upper limits
  73. GRB 220430A: AGILE detection
  74. GRB 220430A: MeerLICHT optical upper limits
  75. GRB 220430A: Enhanced Swift-XRT position
  76. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  77. GRB 220427A: Swift-BAT refined analysis
  78. GRB 220427A: VLT/X-shooter photometry
  79. GRB 220426A: Swift-XRT and UVOT observations
  80. GRB 220423A: Detection by VZLUSAT-2
  81. Konus-Wind detection of GRB 220427A
  82. GRB 220427A: Swift-XRT refined Analysis
  83. GRB 220427A: Enhanced Swift-XRT position
  84. GRB 220426A: Tiled Swift observations
  85. GRB 220427A: Swift detection of a burst with an optical counterpart
  86. Konus-Wind detection of GRB 220426A
  87. IPN triangulation of GRB 220426A
  88. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  89. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  90. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  91. GRB 220421A: Fermi GBM observation
  92. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  93. GRB 220418B: Swift-XRT observations
  94. GRB 220418B Fermi GBM observation
  95. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  96. GRB 220403C: Further Swift-XRT observations
  97. GRB 220418B: Swift ToO observations
  98. GRB 220417A: Fermi GBM detection
  99. GRB 220418B: Swift/BAT-GUANO refined location of a short burst
  100. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst

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