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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"

28108 results found.

  1. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  2. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  3. GRB 081028: Swift detection of a burst
  4. GRB 081024: No radio detection with the VLA
  5. GRB081025: RTT150 optical observations
  6. GRB081024B: P200 Observations
  7. GRB 081024B: Swift-XRT further observations
  8. GRB 081025 BAT refined analysis
  9. Swift UVOT observations of GRB081024B
  10. Konus-Wind observation of GRB 081025
  11. GRB 081025: Swift-XRT position
  12. GRB 081024B: Swift-XRT observations
  13. GRB 081025: Burst detection from Swift-BAT slew data
  14. GRB 081024: Swift-XRT refined analysis
  15. GRB 081024, Swift-BAT refined analysis
  16. GRB 081024: Enhanced Swift-XRT position
  17. GRB 081024: Faulkes Telescope North optical observations
  18. GRB 081024A: ROTSE-III Optical Limits
  19. GRB 081024: Swift detection of a burst
  20. GRB 081022, Swift-BAT refined analysis
  21. GRB 081016A: Swift-XRT refined analysis
  22. Swift detection of a possible burst (trigger 332287)
  23. GRB 081017, Swift-BAT refined analysis
  24. GRB 081017: REM early observations
  25. GRB 081016B, Swift-BAT refined analysis
  26. GRB 081011: Swift XRT refined analysis
  27. GRB 081016B: Swift-XRT Team refined Analysis
  28. GRB 081016B: Enhanced Swift-XRT position
  29. GRB 081016B: ROTSE-III Optical Limits
  30. GRB 081016B: Swift detection of a burst
  31. GRB 081011: Enhanced Swift-XRT position
  32. Swift detection of flare on CC Eri
  33. GRB 081016: A long GRB discovered by INTEGRAL
  34. Trigger 331721 Due to Swift startracker loss-of-lock
  35. Detection of flare star Algol in Swift-BAT slew data
  36. GRB 081009: Fermi GBM detection
  37. GRB 081012: GROND upper limits
  38. Swift-BAT triggered on the flare star Algol
  39. GRB 081012: Fermi GBM detection
  40. GRB 081007 and GRB 081007B: Fermi GBM detection
  41. GRB 080430: optical observations
  42. GRB 081012: Observations from NOT
  43. GRB 081012: Swift/XRT detection
  44. GRB 081012, Swift-BAT refined analysis
  45. GRB081011: UVOT detection of an optical afterglow
  46. GRB 081011: Swift/XRT detection
  47. GRB 081011, Swift-BAT refined analysis
  48. GRB 081008, SMARTS optical/IR afterglow observations
  49. GRB 081011: Swift detection of a burst
  50. GRB 081007: Radio Detection
  51. GRB 081008, Swift-BAT refined analysis
  52. GRB 081008: Swift-XRT Refined Analysis
  53. GRB081008: Swift/UVOT observations
  54. GRB 081008: Enhanced Swift-XRT position
  55. GRB 081008: Swift detection of a burst with optical afterglow
  56. GRB 081008: ROTSE-III Detection of Optical Counterpart
  57. GRB081006B: Fermi GBM detection
  58. GRB081006: Fermi GBM detection
  59. GRB081007: Swift/UVOT Observations
  60. GRB 081007, SMARTS optical afterglow observations
  61. GRB 081007, Swift-BAT refined analysis
  62. GRB 081007: Early RAPTOR measurements of optical counterpart
  63. GRB 081007: Swift-XRT Team refined analysis
  64. GRB 081007: Enhanced Swift-XRT position
  65. GRB 081007, Faulkes Telescope North optical observations
  66. GRB 081007: REM NIR and optical counterpart
  67. GRB 081007: Swift detection of a burst with optical afterglow
  68. GRB081003C: GLAST Burst Monitor detection
  69. GRB 081003B: TAROT Calern observatory optical observations
  70. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  71. GRB 081003B: Swift-XRT upper limit
  72. GRB 081003A: OSN optical observations
  73. GRB 081001: Further observations from OSN
  74. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  75. GRB 081003A: Swift-XRT Team position and analysis
  76. GRB 081003B: a long GRB detected with INTEGRAL
  77. GRB 080928: Fermi GBM detection
  78. GRB 081003: A long GRB discovered by INTEGRAL
  79. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  80. Trigger 330353: Swift detection of a Galactic short soft burst
  81. GRB 081001: Observations from OSN
  82. GRB 080925: Suzaku WAM observation of the prompt emission
  83. GRB 081001: Swift UVOT Observations
  84. GRB 081001: Swift-XRT position
  85. GRB081001: SuperAGILE Localization of a long GRB
  86. GRB 080928: Watcher observations
  87. GRB 080927: Fermi GBM detection
  88. GRB 080928: VLT redshift
  89. GRB 080928: Swift-XRT refined analysis
  90. GRB 080928, Swift-BAT final refined analysis
  91. GRB 080928: GROND DETECTION
  92. GRB 080928: Enhanced Swift-XRT position
  93. GRB 080928, Swift-BAT initial refined analysis
  94. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  95. GRB 080928: Swift detection of a burst with an optical counterpart
  96. GRB 080925: Fermi GBM Detection
  97. GRB 080920: Fermi GBM detection
  98. GRB080922, optical upper limit
  99. Swift trigger 325707: Swift/UVOT Upper Limits
  100. Swift trigger 325707: Swift-XRT upper limit

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