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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"

36012 results found.

  1. GRB 220209A: GECAM detection
  2. GRB 220209A: AGILE/MCAL detection
  3. Fermi GRB 220209A: Global MASTER-Net observations report
  4. GRB 220209A: Fermi GBM Final Real-time Localization
  5. Konus-Wind detection of GRB 220130A
  6. Konus-Wind detection of GRB 220203A
  7. GRB 220203A: GECAM detection
  8. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  9. IPN triangulation of GRB 220203A (short)
  10. IPN triangulation of GRB 220130A
  11. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  12. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  13. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  14. GRB 220201A: Fermi GBM Final Localization
  15. GRB 220128A: AstroSat CZTI detection
  16. GRB 220130A: Fermi GBM Observation
  17. Konus-Wind detection of GRB 220128A
  18. IPN triangulation of GRB 220128A (long)
  19. Fermi GRB 220131A: Global MASTER-Net observations report
  20. GRB 220131B: GECAM detection
  21. GRB 220130A: GECAM detection
  22. GRB 220131A: Fermi GBM Final Real-time Localization
  23. Fermi GRB 220129A: Global MASTER-Net observations report
  24. GRB 220129A: Fermi GBM Final Real-time Localization
  25. GRB 220127A: GECAM detection
  26. Konus-Wind detection of GRB 220124A
  27. IPN triangulation of GRB 220124A
  28. GRB 220124A: GECAM detection
  29. GRB 220117A, GROND observations
  30. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  31. GRB 220117A: Terskol and AbAO optical upper limits
  32. GRB 220118A: TARGET optical upper limit
  33. GRB 220117B: TARGET optical upper limit
  34. GRB 220121B: GECAM detection
  35. IPN triangulation of a bright burst from SGR 1935+2154
  36. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  37. IPN triangulation of GRB 211226A
  38. GRB 220120A: Fermi GBM Final Localization
  39. GRB 220117C: Fermi GBM Observation
  40. GRB 220118A: 2.2m CAHA/CAFOS detections
  41. GRB 220118A: Fermi GBM detection
  42. GRB 220118A: COATLI Optical Observations
  43. GRB 220101A: KAO optical-R observation
  44. GRB 211221A: No V & R detection, KAO telescope
  45. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  46. GRB 220117C: Swift/BAT-GUANO arcminute localization
  47. GRB 220118A: Swift-BAT refined analysis
  48. GRB 220118A: Swift/UVOT Detection
  49. GRB 220118A: GIT optical observations
  50. GRB 220118A: Enhanced Swift-XRT position
  51. GRB 220118A: MITSuME Akeno optical observation
  52. GRB 220117B: z-band limit
  53. Swift GRB 220118A: Global MASTER-Net observations report
  54. GRB 220118A: Swift detection of a burst with an optical counterpart
  55. GRB 220118A: Fermi GBM Final Real-time Localization
  56. GRB 220117A: MITSuME Akeno optical upper limits
  57. Fermi GBM Sub-Threshold Detection of GRB 220117A
  58. GRB 220117B: Swift-BAT refined analysis
  59. GRB 220117A: Swift-BAT refined analysis
  60. GRB 220117B: Swift/UVOT Upper Limits
  61. GRB 220117A: Swift/UVOT Upper Limits
  62. GRB 220117A: LCO Optical Observations
  63. GRB 220117A: VLT/X-shooter optical afterglow and redshift
  64. GRB 220117B: Swift-XRT refined Analysis
  65. GRB 220117A: Swift-XRT refined Analysis
  66. GRB 220117B: Nanshan/NEXT optical upper limit
  67. GRB 220117B: MITSuME Akeno optical upper limits
  68. GRB 220117B: Enhanced Swift-XRT position
  69. GRB 220117A: Enhanced Swift-XRT position
  70. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  71. Swift GRB 220117A: Global MASTER-Net observations report
  72. Swift GRB 220117B: Global MASTER-Net observations report
  73. GRB 220117B: Swift detection of a burst
  74. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  75. GRB 220117A: Swift detection of a burst
  76. GRB 220101A: The most powerful GRB and BDHN I in 26 years
  77. GRB 220115B: Fermi GBM Final Real-time Localization
  78. GRB 210919A: LBT spectroscopic redshift of the host galaxy candidates
  79. GRB 220115A: Fermi GBM Final Real-time Localization
  80. Fermi Gamma-ray Burst Monitor trigger 663917434/220115230 is not a GRB
  81. GRB 220114A: Fermi GBM Final Localization
  82. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  83. GRB 220101A: continued 1.3m DFOT optical observations of a high-redshift afterglow
  84. GRB 220111A: AstroSat CZTI detection
  85. Fermi GRB 220111A: Global MASTER-Net observations report
  86. Konus-Wind detection of GRB 220101A (correction to GCN 31433)
  87. GRB 220111A: BALROG localization (Fermi Trigger 663621714 / GRB 220111807)
  88. GRB 220111A: Fermi GBM Final Real-time Localization
  89. Konus-Wind detection of GRB 220101A
  90. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  91. GRB 220107A: SAO RAS optical observations
  92. Konus-Wind detection of GRB 220107B
  93. Konus-Wind detection of GRB 220107A
  94. Confirmation of the X-ray afterglow of GRB 220107B
  95. GRB 220107A: further SAO RAS optical observations
  96. GRB 220101A: Additional Liverpool telescope photometry
  97. GRB 220107A: 6m BTA spectroscopic redshift
  98. GRB 220107A: SAO RAS optical observations
  99. GRB 220108A: Swift/BAT-GUANO detection outside the coded FOV
  100. GRB 220101A: SAO RAS optical observations

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