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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"

19663 results found.

  1. GRB 140402A: Swift-XRT refined Analysis
  2. GRB 140104B: Swift-XRT refined Analysis
  3. IPN triangulation of a bright burst from SGR 1935+2154
  4. GRB 210119A (Swift J1851.2-6148): Swift-BAT refined analysis
  5. GECAM detection of a short GRB 210119A or a new SGR candidate Swift J1851.2-6148
  6. GRB 210119A: Insight-HXMT/HE detection
  7. GRB 210119A: Fermi GBM observation
  8. GRB 210112A: Insight-HXMT/HE detection
  9. Short Fermi GRB 210119A or new SGR Swift J1851.2-6148: Possible MASTER Short OT detection
  10. Swift detection of a new SGR Swift J1851.2-6148 or a short GRB 210119A
  11. GRB 210112A: Deep CAHA 2.2m detection
  12. GRB 210104A: Late-time CAHA 2.2m detection
  13. Konus-Wind detection of GRB 210112A
  14. ZTF21aaeyldq (AT2021any): Detection of X-ray Emission with Swift/XRT
  15. GRB 210104A: JCMT SCUBA-2 sub-mm observations
  16. GRB 210112A: Swift/UVOT Detection
  17. GRB 210112A: 1.3m DFOT Optical upper limit
  18. GRB 210104A: AstroSat CZTI detection
  19. GRB 210112A: Swift-BAT refined analysis
  20. GRB 210112A: Swift-XRT refined Analysis
  21. GRB 210112A: AGILE detection
  22. GRB 210112A: Kitab a optical upper limit
  23. GRB 210112A: Enhanced Swift-XRT position
  24. GRB 210112A: Swift detection of a burst with an optical counterpart
  25. Correction to GCN 29278: GRB 201216C XRT refined analysis
  26. GRB 201216C: Swift-XRT refined Analysis
  27. GRB 201227A: ASIM observation
  28. GRB 210104A: SARA-KP 0.9m Optical Afterglow Detection
  29. GRB 210102B: further Swift-XRT observations
  30. GRB 210104A: CALET Gamma-Ray Burst Monitor detection
  31. GRB 210104B: Swift-BAT refined analysis
  32. GRB 210104A: early ATLAS detections of the bright afterglow
  33. GRB 210104A: Swift-XRT refined Analysis
  34. GRB 210104B: Swift/UVOT Upper Limits
  35. Konus-Wind detection of GRB 210104A
  36. GRB 210104A: 1.3m DFOT Optical Afterglow Detection
  37. GRB 210104B: Swift-XRT refined Analysis
  38. GRB 210104B: Enhanced Swift-XRT position
  39. GRB 210104A: Swift-BAT refined analysis
  40. GRB 210104B: Nanshan/NEXT optical upper limit
  41. GRB 210104B: BOOTES network optical upper limit
  42. GRB 210104A: MASTER OT rebrightening detection
  43. GRB 210104A: Swift/UVOT Detection
  44. GRB 210104A: Fermi GBM detection
  45. GRB 210104A: Enhanced Swift-XRT position
  46. GRB 210102B: Tiled Swift observations
  47. GRB 210104B: Swift detection of a burst
  48. Swift GRB210104.88: Global MASTER-Net observations report
  49. GRB 210104A: MITSuME Ishigaki optical observation
  50. GRB 210104A: MITSuME Akeno optical observation
  51. GRB 210104A: BOOTES-4/MET early optical afterglow detection
  52. GRB 210104A: Swift detection of a burst with a bright optical counterpart
  53. GRB 210102C: Swift-BAT refined analysis
  54. GRB 210102B: Swift-XRT observations
  55. GRB 210102C: Fermi GBM detection
  56. Swift GRB 210102C: Global MASTER-Net observations report
  57. GRB 210102C: Swift detection of a burst
  58. GRB 210102B: Tiled Swift observations
  59. Swift Trigger 1015615 is not a GRB
  60. Swift GRB210102.01: Global MASTER-Net observations report
  61. GRB 201229A: Swift/UVOT Detection
  62. GRB 201227A: GRAWITA VST-ESO PARANAL observations
  63. GRB 201229A: SAO RAS optical observations
  64. GRB 201229A: Nanshan/NEXT optical upper limit
  65. GRB 201227A: Swift-XRT observations
  66. GRB 201223A: SVOM-GWAC detected the optical counterpart during prompt emission phase
  67. GRB 201229A: Swift-XRT refined Analysis
  68. GRB 201229A: Swift-BAT refined analysis
  69. GRB 201229A: Enhanced Swift-XRT position
  70. GRB 201229A: Swift detection of a burst with a possible optical counterpart
  71. GRB 201227A: Tiled Swift observations
  72. GRB 201227A: Swift ToO observations
  73. IPN triangulation of GRB 201227A (short)
  74. GRB 201223A: AROMA-N Optical Observation
  75. GRB 201223A: Swift/UVOT Detection
  76. GRB 201223A: HCT optical upper limit
  77. GRB 201223A: 1.3m DFOT and 1.04m ST optical observations
  78. GRB 201223A: Swift-XRT refined Analysis
  79. GRB 201223A: Enhanced Swift-XRT position
  80. GRB 201223A: GROWTH-India Telescope (GIT) photometric follow-up.
  81. GRB 201223A: MITSuME Akeno optical observation
  82. GRB 201223A: Swift-BAT refined analysis
  83. GRB 201223A: Fermi GBM Detection
  84. GRB 201223A: BOOTES-4/MET early optical observation
  85. GRB 201223A: Nanshan/NEXT early optical afterglow detection
  86. GRB 201223A: Swift detection of a burst with a bright optical counterpart
  87. Swift GRB201223.75: Global MASTER-Net OT detection
  88. Swift GRB201223.75: Global MASTER-Net observations report
  89. Swift-XRT observations of Icecube 201222A
  90. GRB 201221A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  91. GRB 201221D: MMT MMIRS detection of marginally extended source
  92. GRB 201221D: LCOGT upper limits
  93. GRB 201221D: Fermi GBM detection
  94. GRB 201221D: Swift-BAT refined analysis
  95. Swift Trigger 1014012 (possible GRB 201221C) is likely not an astrophysical event
  96. GRB 201216A - further Swift-XRT observations
  97. Konus-Wind detection of GRB 201221D (short)
  98. GRB 201221D: Swift/UVOT Upper Limits
  99. GRB 201221D: Lowell Discovery Telescope afterglow observations
  100. GRB 201221D: FRAM-ORM optical limit

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