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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"

36105 results found.

  1. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  2. IPN triangulation of GRB 220203A (short)
  3. IPN triangulation of GRB 220130A
  4. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  5. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  6. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  7. GRB 220201A: Fermi GBM Final Localization
  8. GRB 220128A: AstroSat CZTI detection
  9. GRB 220130A: Fermi GBM Observation
  10. Konus-Wind detection of GRB 220128A
  11. IPN triangulation of GRB 220128A (long)
  12. Fermi GRB 220131A: Global MASTER-Net observations report
  13. GRB 220131B: GECAM detection
  14. GRB 220130A: GECAM detection
  15. GRB 220131A: Fermi GBM Final Real-time Localization
  16. Fermi GRB 220129A: Global MASTER-Net observations report
  17. GRB 220129A: Fermi GBM Final Real-time Localization
  18. GRB 220127A: GECAM detection
  19. Konus-Wind detection of GRB 220124A
  20. IPN triangulation of GRB 220124A
  21. GRB 220124A: GECAM detection
  22. GRB 220117A, GROND observations
  23. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  24. GRB 220117A: Terskol and AbAO optical upper limits
  25. GRB 220118A: TARGET optical upper limit
  26. GRB 220117B: TARGET optical upper limit
  27. GRB 220121B: GECAM detection
  28. IPN triangulation of a bright burst from SGR 1935+2154
  29. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  30. IPN triangulation of GRB 211226A
  31. GRB 220120A: Fermi GBM Final Localization
  32. GRB 220117C: Fermi GBM Observation
  33. GRB 220118A: 2.2m CAHA/CAFOS detections
  34. GRB 220118A: Fermi GBM detection
  35. GRB 220118A: COATLI Optical Observations
  36. GRB 220101A: KAO optical-R observation
  37. GRB 211221A: No V & R detection, KAO telescope
  38. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  39. GRB 220117C: Swift/BAT-GUANO arcminute localization
  40. GRB 220118A: Swift-BAT refined analysis
  41. GRB 220118A: Swift/UVOT Detection
  42. GRB 220118A: GIT optical observations
  43. GRB 220118A: Enhanced Swift-XRT position
  44. GRB 220118A: MITSuME Akeno optical observation
  45. GRB 220117B: z-band limit
  46. Swift GRB 220118A: Global MASTER-Net observations report
  47. GRB 220118A: Swift detection of a burst with an optical counterpart
  48. GRB 220118A: Fermi GBM Final Real-time Localization
  49. GRB 220117A: MITSuME Akeno optical upper limits
  50. Fermi GBM Sub-Threshold Detection of GRB 220117A
  51. GRB 220117B: Swift-BAT refined analysis
  52. GRB 220117A: Swift-BAT refined analysis
  53. GRB 220117B: Swift/UVOT Upper Limits
  54. GRB 220117A: Swift/UVOT Upper Limits
  55. GRB 220117A: LCO Optical Observations
  56. GRB 220117A: VLT/X-shooter optical afterglow and redshift
  57. GRB 220117B: Swift-XRT refined Analysis
  58. GRB 220117A: Swift-XRT refined Analysis
  59. GRB 220117B: Nanshan/NEXT optical upper limit
  60. GRB 220117B: MITSuME Akeno optical upper limits
  61. GRB 220117B: Enhanced Swift-XRT position
  62. GRB 220117A: Enhanced Swift-XRT position
  63. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  64. Swift GRB 220117A: Global MASTER-Net observations report
  65. Swift GRB 220117B: Global MASTER-Net observations report
  66. GRB 220117B: Swift detection of a burst
  67. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  68. GRB 220117A: Swift detection of a burst
  69. GRB 220101A: The most powerful GRB and BDHN I in 26 years
  70. GRB 220115B: Fermi GBM Final Real-time Localization
  71. GRB 210919A: LBT spectroscopic redshift of the host galaxy candidates
  72. GRB 220115A: Fermi GBM Final Real-time Localization
  73. Fermi Gamma-ray Burst Monitor trigger 663917434/220115230 is not a GRB
  74. GRB 220114A: Fermi GBM Final Localization
  75. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  76. GRB 220101A: continued 1.3m DFOT optical observations of a high-redshift afterglow
  77. GRB 220111A: AstroSat CZTI detection
  78. Fermi GRB 220111A: Global MASTER-Net observations report
  79. Konus-Wind detection of GRB 220101A (correction to GCN 31433)
  80. GRB 220111A: BALROG localization (Fermi Trigger 663621714 / GRB 220111807)
  81. GRB 220111A: Fermi GBM Final Real-time Localization
  82. Konus-Wind detection of GRB 220101A
  83. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  84. GRB 220107A: SAO RAS optical observations
  85. Konus-Wind detection of GRB 220107B
  86. Konus-Wind detection of GRB 220107A
  87. Confirmation of the X-ray afterglow of GRB 220107B
  88. GRB 220107A: further SAO RAS optical observations
  89. GRB 220101A: Additional Liverpool telescope photometry
  90. GRB 220107A: 6m BTA spectroscopic redshift
  91. GRB 220107A: SAO RAS optical observations
  92. GRB 220108A: Swift/BAT-GUANO detection outside the coded FOV
  93. GRB 220101A: SAO RAS optical observations
  94. GRB 220107A: AbAO and Terskol optical observations
  95. GRB 220107B: MITSuME Akeno optical upper limits
  96. GRB 220107B: Nanshan/NEXT optical upper limits and host galaxy candidate
  97. GRB 220107A: Nanshan/NEXT optical observations
  98. GRB 220107A: Swift/UVOT Detection
  99. GRB 220107B: Fermi GBM observations
  100. GRB 220107A: MITSuME Akeno optical observation

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