Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

28301 results found.

  1. GRB 081025 BAT refined analysis
  2. Swift UVOT observations of GRB081024B
  3. Konus-Wind observation of GRB 081025
  4. GRB 081025: Swift-XRT position
  5. GRB 081024B: Swift-XRT observations
  6. GRB 081025: Burst detection from Swift-BAT slew data
  7. GRB 081024: Swift-XRT refined analysis
  8. GRB 081024, Swift-BAT refined analysis
  9. GRB 081024: Enhanced Swift-XRT position
  10. GRB 081024: Faulkes Telescope North optical observations
  11. GRB 081024A: ROTSE-III Optical Limits
  12. GRB 081024: Swift detection of a burst
  13. GRB 081022, Swift-BAT refined analysis
  14. GRB 081016A: Swift-XRT refined analysis
  15. Swift detection of a possible burst (trigger 332287)
  16. GRB 081017, Swift-BAT refined analysis
  17. GRB 081017: REM early observations
  18. GRB 081016B, Swift-BAT refined analysis
  19. GRB 081011: Swift XRT refined analysis
  20. GRB 081016B: Swift-XRT Team refined Analysis
  21. GRB 081016B: Enhanced Swift-XRT position
  22. GRB 081016B: ROTSE-III Optical Limits
  23. GRB 081016B: Swift detection of a burst
  24. GRB 081011: Enhanced Swift-XRT position
  25. Swift detection of flare on CC Eri
  26. GRB 081016: A long GRB discovered by INTEGRAL
  27. Trigger 331721 Due to Swift startracker loss-of-lock
  28. Detection of flare star Algol in Swift-BAT slew data
  29. GRB 081009: Fermi GBM detection
  30. GRB 081012: GROND upper limits
  31. Swift-BAT triggered on the flare star Algol
  32. GRB 081012: Fermi GBM detection
  33. GRB 081007 and GRB 081007B: Fermi GBM detection
  34. GRB 080430: optical observations
  35. GRB 081012: Observations from NOT
  36. GRB 081012: Swift/XRT detection
  37. GRB 081012, Swift-BAT refined analysis
  38. GRB081011: UVOT detection of an optical afterglow
  39. GRB 081011: Swift/XRT detection
  40. GRB 081011, Swift-BAT refined analysis
  41. GRB 081008, SMARTS optical/IR afterglow observations
  42. GRB 081011: Swift detection of a burst
  43. GRB 081007: Radio Detection
  44. GRB 081008, Swift-BAT refined analysis
  45. GRB 081008: Swift-XRT Refined Analysis
  46. GRB081008: Swift/UVOT observations
  47. GRB 081008: Enhanced Swift-XRT position
  48. GRB 081008: Swift detection of a burst with optical afterglow
  49. GRB 081008: ROTSE-III Detection of Optical Counterpart
  50. GRB081006B: Fermi GBM detection
  51. GRB081006: Fermi GBM detection
  52. GRB081007: Swift/UVOT Observations
  53. GRB 081007, SMARTS optical afterglow observations
  54. GRB 081007, Swift-BAT refined analysis
  55. GRB 081007: Early RAPTOR measurements of optical counterpart
  56. GRB 081007: Swift-XRT Team refined analysis
  57. GRB 081007: Enhanced Swift-XRT position
  58. GRB 081007, Faulkes Telescope North optical observations
  59. GRB 081007: REM NIR and optical counterpart
  60. GRB 081007: Swift detection of a burst with optical afterglow
  61. GRB081003C: GLAST Burst Monitor detection
  62. GRB 081003B: TAROT Calern observatory optical observations
  63. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  64. GRB 081003B: Swift-XRT upper limit
  65. GRB 081003A: OSN optical observations
  66. GRB 081001: Further observations from OSN
  67. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  68. GRB 081003A: Swift-XRT Team position and analysis
  69. GRB 081003B: a long GRB detected with INTEGRAL
  70. GRB 080928: Fermi GBM detection
  71. GRB 081003: A long GRB discovered by INTEGRAL
  72. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  73. Trigger 330353: Swift detection of a Galactic short soft burst
  74. GRB 081001: Observations from OSN
  75. GRB 080925: Suzaku WAM observation of the prompt emission
  76. GRB 081001: Swift UVOT Observations
  77. GRB 081001: Swift-XRT position
  78. GRB081001: SuperAGILE Localization of a long GRB
  79. GRB 080928: Watcher observations
  80. GRB 080927: Fermi GBM detection
  81. GRB 080928: VLT redshift
  82. GRB 080928: Swift-XRT refined analysis
  83. GRB 080928, Swift-BAT final refined analysis
  84. GRB 080928: GROND DETECTION
  85. GRB 080928: Enhanced Swift-XRT position
  86. GRB 080928, Swift-BAT initial refined analysis
  87. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  88. GRB 080928: Swift detection of a burst with an optical counterpart
  89. GRB 080925: Fermi GBM Detection
  90. GRB 080920: Fermi GBM detection
  91. GRB080922, optical upper limit
  92. Swift trigger 325707: Swift/UVOT Upper Limits
  93. Swift trigger 325707: Swift-XRT upper limit
  94. Swift detection of a possible GRB (trigger 325707)
  95. GRB080916A: Suzaku WAM observation of the prompt emission
  96. GRB 080922: Swift/UVOT Upper Limits
  97. GRB080922: Swift-XRT upper limit
  98. GRB080922: A long GRB detected by INTEGRAL
  99. GRB 080913B: Fermi GBM detection
  100. Trigger 324561: IGR J08408-4503 detected by Swift

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov