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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"

28116 results found.

  1. GRB 081021: Fermi GBM detection
  2. Swift UVOT observations of GRB081028
  3. GRB 081028: Swift-XRT refined analysis
  4. GRB 081028, Swift-BAT refined analysis
  5. GRB 081028: Enhanced Swift-XRT position
  6. GRB 081028: TAROT Calern observatory optical observations
  7. GRB 081028: optical observations at the NOT
  8. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  9. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  10. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  11. GRB 081028: Swift detection of a burst
  12. GRB 081024: No radio detection with the VLA
  13. GRB081025: RTT150 optical observations
  14. GRB081024B: P200 Observations
  15. GRB 081024B: Swift-XRT further observations
  16. GRB 081025 BAT refined analysis
  17. Swift UVOT observations of GRB081024B
  18. Konus-Wind observation of GRB 081025
  19. GRB 081025: Swift-XRT position
  20. GRB 081024B: Swift-XRT observations
  21. GRB 081025: Burst detection from Swift-BAT slew data
  22. GRB 081024: Swift-XRT refined analysis
  23. GRB 081024, Swift-BAT refined analysis
  24. GRB 081024: Enhanced Swift-XRT position
  25. GRB 081024: Faulkes Telescope North optical observations
  26. GRB 081024A: ROTSE-III Optical Limits
  27. GRB 081024: Swift detection of a burst
  28. GRB 081022, Swift-BAT refined analysis
  29. GRB 081016A: Swift-XRT refined analysis
  30. Swift detection of a possible burst (trigger 332287)
  31. GRB 081017, Swift-BAT refined analysis
  32. GRB 081017: REM early observations
  33. GRB 081016B, Swift-BAT refined analysis
  34. GRB 081011: Swift XRT refined analysis
  35. GRB 081016B: Swift-XRT Team refined Analysis
  36. GRB 081016B: Enhanced Swift-XRT position
  37. GRB 081016B: ROTSE-III Optical Limits
  38. GRB 081016B: Swift detection of a burst
  39. GRB 081011: Enhanced Swift-XRT position
  40. Swift detection of flare on CC Eri
  41. GRB 081016: A long GRB discovered by INTEGRAL
  42. Trigger 331721 Due to Swift startracker loss-of-lock
  43. Detection of flare star Algol in Swift-BAT slew data
  44. GRB 081009: Fermi GBM detection
  45. GRB 081012: GROND upper limits
  46. Swift-BAT triggered on the flare star Algol
  47. GRB 081012: Fermi GBM detection
  48. GRB 081007 and GRB 081007B: Fermi GBM detection
  49. GRB 080430: optical observations
  50. GRB 081012: Observations from NOT
  51. GRB 081012: Swift/XRT detection
  52. GRB 081012, Swift-BAT refined analysis
  53. GRB081011: UVOT detection of an optical afterglow
  54. GRB 081011: Swift/XRT detection
  55. GRB 081011, Swift-BAT refined analysis
  56. GRB 081008, SMARTS optical/IR afterglow observations
  57. GRB 081011: Swift detection of a burst
  58. GRB 081007: Radio Detection
  59. GRB 081008, Swift-BAT refined analysis
  60. GRB 081008: Swift-XRT Refined Analysis
  61. GRB081008: Swift/UVOT observations
  62. GRB 081008: Enhanced Swift-XRT position
  63. GRB 081008: Swift detection of a burst with optical afterglow
  64. GRB 081008: ROTSE-III Detection of Optical Counterpart
  65. GRB081006B: Fermi GBM detection
  66. GRB081006: Fermi GBM detection
  67. GRB081007: Swift/UVOT Observations
  68. GRB 081007, SMARTS optical afterglow observations
  69. GRB 081007, Swift-BAT refined analysis
  70. GRB 081007: Early RAPTOR measurements of optical counterpart
  71. GRB 081007: Swift-XRT Team refined analysis
  72. GRB 081007: Enhanced Swift-XRT position
  73. GRB 081007, Faulkes Telescope North optical observations
  74. GRB 081007: REM NIR and optical counterpart
  75. GRB 081007: Swift detection of a burst with optical afterglow
  76. GRB081003C: GLAST Burst Monitor detection
  77. GRB 081003B: TAROT Calern observatory optical observations
  78. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  79. GRB 081003B: Swift-XRT upper limit
  80. GRB 081003A: OSN optical observations
  81. GRB 081001: Further observations from OSN
  82. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  83. GRB 081003A: Swift-XRT Team position and analysis
  84. GRB 081003B: a long GRB detected with INTEGRAL
  85. GRB 080928: Fermi GBM detection
  86. GRB 081003: A long GRB discovered by INTEGRAL
  87. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  88. Trigger 330353: Swift detection of a Galactic short soft burst
  89. GRB 081001: Observations from OSN
  90. GRB 080925: Suzaku WAM observation of the prompt emission
  91. GRB 081001: Swift UVOT Observations
  92. GRB 081001: Swift-XRT position
  93. GRB081001: SuperAGILE Localization of a long GRB
  94. GRB 080928: Watcher observations
  95. GRB 080927: Fermi GBM detection
  96. GRB 080928: VLT redshift
  97. GRB 080928: Swift-XRT refined analysis
  98. GRB 080928, Swift-BAT final refined analysis
  99. GRB 080928: GROND DETECTION
  100. GRB 080928: Enhanced Swift-XRT position

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