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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"

19670 results found.

  1. GRB 210226A: Swift detection of a burst
  2. GRB 210222B: MITSuME Akeno optical upper limits
  3. GRB 210222B: Swift-BAT refined analysis
  4. GRB 210222B: Swift-XRT refined Analysis
  5. GRB 210222B: Swift/UVOT Detection
  6. GRB 210222B: KAIT Optical Upper Limit
  7. GRB 210218A: Swift/UVOT observations
  8. GRB 210217A: Swift/UVOT Detection
  9. GRB 210222B: MASTER OT observation
  10. GRB 210222B: GOTO confirmation of afterglow detection
  11. GRB210222B: LCO Optical Afterglow Detection
  12. GRB210222B: BOOTES-1 optical afterglow detection
  13. GRB 210222B: Swift detection of a burst with an optical counterpart
  14. Swift GRB210222.94: Global MASTER-Net observations report
  15. GRB 210218A: Swift-XRT observations
  16. GRB 210212A: Lowell Discovery Telescope observations
  17. GRB 210217A: 1.3m DFOT optical detection
  18. GRB 210217A: Swift-XRT refined Analysis
  19. GRB 210218A: Swift-BAT refined analysis
  20. Fermi GBM Sub-Threshold Detection of GRB 210217A
  21. GRB 210217A: Liverpool Telescope First Hour Observations
  22. GRB 210217A: Swift-BAT refined analysis
  23. GRB 210217A: KAIT Optical Observations
  24. GRB 210218A: MITSuME Akeno optical upper limits
  25. GRB 210218A： GWAC-F60A optical upper limit
  26. GRB 210218A: NEXT optical upper limit
  27. GRB 210218A: Swift detection of a burst
  28. GRB 210205A: observations with the 3.6m DOT, a potential dark burst?
  29. GRB 210217A: Enhanced Swift-XRT position
  30. Fermi/GBM observation of a burst from SGR 1830-0645
  31. GRB 210217A: NEXT early optical afterglow observations
  32. GRB 210217A: Swift detection of a burst with an optical counterpart
  33. GRB 210210A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  34. Swift Trigger 1033144: Detection of SGR 1830-0645
  35. GRB 210212B: Swift ToO observations
  36. IPN triangulation of GRB 210212B (consistent with ZTF21aakruew/AT2021cwd)
  37. GRB 210212A: 1.3m DFOT Optical upper limit
  38. GRB 210212A: Gemini South optical observations
  39. Swift Trigger 1032350: Detection of SGR 1830-0645
  40. GRB 210212A: Possible host galaxy counterpart with the NOT
  41. Swift GRB 210212A: Global MASTER-Net observations report
  42. GRB 210212A: MITSuME Akeno optical upper limits
  43. GRB 210212A: Swift-XRT refined Analysis
  44. GRB 210212A: BOOTES-4/MET optical upper limit
  45. GRB 210212A: Swift/UVOT Upper Limits
  46. GRB 210212A: Swift-BAT refined analysis
  47. GRB 210212A: Enhanced Swift-XRT position
  48. GRB 210212A: Swift detection of a burst
  49. GRB 210207B: GECAM detection
  50. GRB 210211A: Swift/UVOT Detection
  51. GRB 210211A: Swift-XRT refined Analysis
  52. GRB 210211A: Swift-BAT refined analysis
  53. GRB 210211A: Fermi GBM observation
  54. Swift-XRT observations of IceCube-210210A
  55. GRB 210209A: Swift-BAT refined analysis
  56. GRB 210211A: Enhanced Swift-XRT position
  57. GRB 210211A: MASTER optical observation of REM OT
  58. GRB 210211A: Swift detection of a burst
  59. Swift GRB210211.36: Global MASTER-Net observations report
  60. GRB 210210A: Swift-BAT refined analysis
  61. GRB 210209A: BOOTES-4/MET optical upper limit
  62. GRB 210210A: LCO Optical Afterglow Detection
  63. Swift GRB 210209A: Global MASTER-Net observations report
  64. GRB 210210A: Swift/UVOT Detection
  65. GRB 210209A: MITSuME Akeno optical upper limits
  66. GRB 210209A: Swift/UVOT Upper Limits
  67. GRB 210210A: Swift-XRT refined Analysis
  68. GRB 210210A: Redshift from OSIRIS/GTC
  69. GRB 210209A: Swift-XRT refined Analysis
  70. GRB 210210A: Enhanced Swift-XRT position
  71. GRB 210210A: MASTER afterglow observation
  72. Swift GRB 210210A: Global MASTER-Net observations report
  73. GRB 210210A: Swift detection of a burst with an optical counterpart
  74. GRB 210209A: Enhanced Swift-XRT position
  75. GRB 210209A: Swift detection of a burst
  76. GRB 210207B: Continued LCO Observations
  77. GRB 210207B: AstroSat CZTI detection
  78. GRB 210207B: Swift/UVOT Detection
  79. GRB 210207B: Swift-BAT refined analysis
  80. GRB 210207B: Insight-HXMT/HE detection
  81. GRB 210207B: LCO Optical Afterglow Detection
  82. GRB 210207B: KAIT Optical Observations
  83. GRB 210207B: AGILE observations
  84. GRB 210207B: Swift-XRT refined Analysis
  85. Konus-Wind detection of GRB 210207B
  86. GRB 210207B: Enhanced Swift-XRT position
  87. GRB 210207B: optical detection with 3.6m Devasthal Optical Telescope
  88. GRB 210207B: Swift detection of a burst with a bright optical counterpart
  89. GRB 210204A / ZTF21aagwbjr: Swift-XRT observations
  90. GRB 210204A: Swift ToO observations
  91. GRB 210205A: Swift-BAT refined analysis
  92. IPN triangulation of GRB 210204A
  93. GRB 210205A: Swift-XRT refined Analysis
  94. GRB 210205A: MITSuME Ishigaki optical observation
  95. GRB 210205A: Swift/UVOT Upper Limits
  96. Swift GRB 210205A: Global MASTER-Net observations report
  97. GRB 210205A: BOOTES-4/MET optical upper limit
  98. GRB 210205A: Enhanced Swift-XRT position
  99. GRB 210205A: Swift detection of a burst
  100. GRB 210202A: Fermi-LAT detection

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Download all Circulars as a .tar.gz archive (updated once a day):
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