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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"

19662 results found.

  1. GRB 081029: UVOT Detection of the Optical Afterglow
  2. GRB 081029: Swift-BAT refined analysis
  3. GRB081029: Swift XRT refined analysis
  4. GRB 081029: Enhanced Swift-XRT position
  5. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  6. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  7. GRB 081029: ROTSE-III Detection of Optical Counterpart
  8. GRB 081029: Swift detection of a burst
  9. GRB081028: UVOT detection of a brightening afterglow
  10. Swift UVOT observations of GRB081028
  11. GRB 081028: Swift-XRT refined analysis
  12. GRB 081028, Swift-BAT refined analysis
  13. GRB 081028: Enhanced Swift-XRT position
  14. GRB 081028: TAROT Calern observatory optical observations
  15. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  16. GRB 081028: Swift detection of a burst
  17. GRB 081024: No radio detection with the VLA
  18. GRB081025: RTT150 optical observations
  19. GRB 081024B: Swift-XRT further observations
  20. GRB 081025 BAT refined analysis
  21. Swift UVOT observations of GRB081025
  22. Swift UVOT observations of GRB081024B
  23. Konus-Wind observation of GRB 081025
  24. GRB 081025: Swift-XRT position
  25. GRB 081024B: Swift-XRT observations
  26. GRB 081025: Burst detection from Swift-BAT slew data
  27. Swift UVOT observations of GRB 081024
  28. GRB 081024: Swift-XRT refined analysis
  29. GRB 081024, Swift-BAT refined analysis
  30. GRB 081024: Enhanced Swift-XRT position
  31. GRB 081024: KAIT Optical Limits
  32. GRB 081024: Early Super-LOTIS Observations
  33. GRB 081024A: ROTSE-III Optical Limits
  34. GRB 081024: Swift detection of a burst
  35. GRB 081022, Swift-BAT refined analysis
  36. GRB 081016A: Swift-XRT refined analysis
  37. GRB 081022: Swift detection of a burst
  38. GRB 081012: Swift-XRT Refined Analysis
  39. Swift trigger 332287 is not a GRB
  40. Swift detection of a possible burst (trigger 332287)
  41. GRB 081012 - Enhanced Swift XRT position
  42. GRB 081017, Swift-BAT refined analysis
  43. GRB 081017: Swift detection of a burst
  44. GRB 081016B, Swift-BAT refined analysis
  45. GRB 081016B: Swift/UVOT Upper Limits
  46. GRB 081011: Swift XRT refined analysis
  47. GRB 081016B: Swift-XRT Team refined Analysis
  48. GRB 081016B: Enhanced Swift-XRT position
  49. GRB 081016B: ROTSE-III Optical Limits
  50. GRB 081016B: Swift detection of a burst
  51. GRB 081011: Enhanced Swift-XRT position
  52. GRB 081016: Swift-XRT candidate afterglow detection
  53. Swift detection of flare on CC Eri
  54. Trigger 331721 Due to Swift startracker loss-of-lock
  55. Detection of flare star Algol in Swift-BAT slew data
  56. Swift-BAT triggered on the flare star Algol
  57. GRB 081012: Fermi GBM detection
  58. GRB 081007 and GRB 081007B: Fermi GBM detection
  59. GRB 081012: Swift/UVOT analysis of initial observations
  60. GRB 081012: Swift/XRT detection
  61. GRB 081012, Swift-BAT refined analysis
  62. GRB 081012: ROTSE-III Optical Limits
  63. GRB 081012: Swift detection of a burst
  64. Revised table for GRB 081011 UVOT detections
  65. GRB081011: UVOT detection of an optical afterglow
  66. GRB 081011: Swift/XRT detection
  67. GRB 081011, Swift-BAT refined analysis
  68. GRB 081011: Swift detection of a burst
  69. GRB 081008, Swift-BAT refined analysis
  70. GRB 081008: Swift-XRT Refined Analysis
  71. GRB081008: Swift/UVOT observations
  72. GRB 081008: Enhanced Swift-XRT position
  73. GRB 081008: Swift detection of a burst with optical afterglow
  74. GRB 081008: ROTSE-III Detection of Optical Counterpart
  75. GRB081007: Swift/UVOT Observations
  76. GRB 081007, Swift-BAT refined analysis
  77. GRB 081007: Early RAPTOR measurements of optical counterpart
  78. GRB 081007: Swift-XRT Team refined analysis
  79. GRB 081007: Enhanced Swift-XRT position
  80. GRB 081007: Swift detection of a burst with optical afterglow
  81. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  82. GRB 081003B: Swift-XRT upper limit
  83. GRB 081003A: OSN optical observations
  84. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  85. GRB 081003A: Swift-XRT Team position and analysis
  86. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  87. GRB 080928: Fermi GBM detection
  88. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  89. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  90. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  91. Trigger 330353: Swift detection of a Galactic short soft burst
  92. GRB 081001: Observations from OSN
  93. GRB 081001: Swift UVOT Observations
  94. GRB 081001: Swift-XRT position
  95. GRB 080928: Watcher observations
  96. GRB 080928: VLT redshift
  97. GRB 080928: Swift-XRT refined analysis
  98. GRB 080928: Swift/UVOT observations
  99. GRB 080928, Swift-BAT final refined analysis
  100. GRB 080928: Enhanced Swift-XRT position

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