Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

45421 results found.

  1. GRB 081028: Swift detection of a burst
  2. GRB 081025: TLS upper limits
  3. GRB 081024: No radio detection with the VLA
  4. GRB081025: RTT150 optical observations
  5. GRB081024B: P200 Observations
  6. GRB 081024B: Swift-XRT further observations
  7. GRB 081025 BAT refined analysis
  8. Swift UVOT observations of GRB081025
  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 081024B: Fermi Gamma-ray Burst Monitor detection
  15. Fermi-LAT observation of GRB 081024B
  16. Swift UVOT observations of GRB 081024
  17. GRB 081024: Swift-XRT refined analysis
  18. GRB 081024, Swift-BAT refined analysis
  19. GRB 081024: Enhanced Swift-XRT position
  20. GRB 081024: Faulkes Telescope North optical observations
  21. GRB 081024: KAIT Optical Limits
  22. GRB 081024: Early Super-LOTIS Observations
  23. GRB 081024A: ROTSE-III Optical Limits
  24. GRB 081024: Swift detection of a burst
  25. GRB 081022, Swift-BAT refined analysis
  26. GRB 081016A: Swift-XRT refined analysis
  27. GRB 081022: Swift detection of a burst
  28. GRB 081012: Swift-XRT Refined Analysis
  29. Swift trigger 332287 is not a GRB
  30. Swift detection of a possible burst (trigger 332287)
  31. GRB 081012 - Enhanced Swift XRT position
  32. GRB 081017, Swift-BAT refined analysis
  33. GRB 081017: REM early observations
  34. GRB 081017: Swift detection of a burst
  35. GRB 081016B, Swift-BAT refined analysis
  36. GRB 081016B: Swift/UVOT Upper Limits
  37. GRB 081011: Swift XRT refined analysis
  38. GRB 081016B: Swift-XRT Team refined Analysis
  39. GRB 081016B: Enhanced Swift-XRT position
  40. GRB 081016B: ROTSE-III Optical Limits
  41. GRB 081016B: Swift detection of a burst
  42. GRB 081011: Enhanced Swift-XRT position
  43. GRB 081016: Swift-XRT candidate afterglow detection
  44. Swift detection of flare on CC Eri
  45. GRB 081016: A long GRB discovered by INTEGRAL
  46. Trigger 331721 Due to Swift startracker loss-of-lock
  47. Detection of flare star Algol in Swift-BAT slew data
  48. GRB 081009: Fermi GBM detection
  49. GRB 081012: GROND upper limits
  50. GRB 081008: Galaxy associated with z=1.967 absorber
  51. Swift-BAT triggered on the flare star Algol
  52. GRB 081012: Fermi GBM detection
  53. GRB 081007 and GRB 081007B: Fermi GBM detection
  54. GRB 080430: optical observations
  55. GRB 081008 optical upper limit
  56. GRB 081012: Observations from NOT
  57. GRB 081012: Swift/UVOT analysis of initial observations
  58. GRB 081012: Swift/XRT detection
  59. GRB 081012, Swift-BAT refined analysis
  60. GRB 081012: ROTSE-III Optical Limits
  61. GRB 081012: Swift detection of a burst
  62. Revised table for GRB 081011 UVOT detections
  63. GRB081011: UVOT detection of an optical afterglow
  64. GRB 081011: Swift/XRT detection
  65. GRB 081011, Swift-BAT refined analysis
  66. GRB 081008, SMARTS optical/IR afterglow observations
  67. GRB 081011: Swift detection of a burst
  68. GRB 081007: Radio Detection
  69. Konus-Wind observation of GRB 081001
  70. GRB 081007: Rapid PROMPT Detections
  71. GRB 081008, Swift-BAT refined analysis
  72. GRB 081008: VLT redshift confirmation
  73. GRB 081008: Swift-XRT Refined Analysis
  74. GRB081008: Swift/UVOT observations
  75. GRB 081008: Enhanced Swift-XRT position
  76. GRB 081008: Gemini-South Absorption Redshiftt
  77. GRB 081008: VLT/FORS2 spectroscopy
  78. GRB 081008: Swift detection of a burst with optical afterglow
  79. GRB 081008: ROTSE-III Detection of Optical Counterpart
  80. GRB081006B: Fermi GBM detection
  81. GRB081006: Fermi GBM detection
  82. GRB081007: Swift/UVOT Observations
  83. GRB 081007, SMARTS optical afterglow observations
  84. GRB 081007, Swift-BAT refined analysis
  85. GRB 081007: Early RAPTOR measurements of optical counterpart
  86. GRB 081007: Swift-XRT Team refined analysis
  87. GRB 081007: Gemini-south redshift
  88. GRB 081007: Enhanced Swift-XRT position
  89. GRB 081007, Faulkes Telescope North optical observations
  90. GRB 081007, SMARTS optical/IR afterglow observations
  91. GRB 081007: REM NIR and optical counterpart
  92. GRB 081007: Swift detection of a burst with optical afterglow
  93. GRB081003C: GLAST Burst Monitor detection
  94. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  95. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  96. GRB 081003B: TAROT Calern observatory optical observations
  97. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  98. GRB 081003B: Swift-XRT upper limit
  99. GRB 081003A: OSN optical observations
  100. GRB 081001: Further observations from OSN

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