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"

42576 results found.

  1. GRB 081203A: Optical observations of Xinglong TNT telescope
  2. GRB 081203A: Skynet/GORT Detections
  3. GRB 081204: Swift XRT afterglow candidate
  4. GRB081203A: optical observation
  5. GRB 081204 : a long GRB localized by INTEGRAL
  6. VLA Radio upper limit on GRB 081203A
  7. Swift-XRT observations of GRB 081203B
  8. Konus-Wind observation of GRB 081203A
  9. Konus-Wind observation of GRB 081203B
  10. GRB081203A: Swift-XRT refined analysis
  11. GRB 081203B: optical observations
  12. Swift/UVOT detection of GRB081203B
  13. GRB 081203B: Swift-XRT candidate afterglow.
  14. GRB 081203A: optical observations
  15. Swift UVOT observations of GRB 081203A
  16. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  17. GRB081203A: Swift/UVOT grism redshift
  18. GRB 081203A: Burst detection from Swift-BAT slew data
  19. GRB 081203A: Swift-BAT refined analysis
  20. GRB 081203: Enhanced Swift-XRT position
  21. GRB 081130B: MASTER prompt optical observations
  22. GRB081203: optical observation
  23. GRB 081203: Swift detection of a burst with a bright optical counterpart
  24. GRB 081128: optical observation
  25. GRB 081130B: Fermi GBM detection
  26. GRB 081130: Fermi GBM detection
  27. Swift Trigger 335971: Swift/UVOT Observations
  28. GRB 081126: afterglow photometry
  29. GRB 081126: Fermi GBM detection
  30. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  31. VLA Radio upper limit on GRB 081126
  32. GRB 081129: Fermi GBM detection
  33. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  34. GRB 081128A: optical observations
  35. Swift Trigger 335971 is probably not a real source
  36. Trigger 335971: Swift possible detection of a burst
  37. GRB081128: Swift/UVOT Upper Limits
  38. SGR 1806-20: Fermi GBM detection.
  39. GRB 081122B: Fermi GBM Detection
  40. GRB 081128: Swift-XRT refined analysis
  41. GRB 081128: Liverpool Telescope afterglow confirmation
  42. GRB081128: optical observations
  43. GRB 081128: Swift-BAT refined analysis
  44. GRB 081128: Enhanced Swift-XRT position
  45. GRB 081128: Optical observation of xinglong TNT
  46. GRB 081128: Swift detection of a burst
  47. GRB081126: Afterglow photometry from Crni Vrh
  48. GRB 081127: Swift/UVOT Upper Limits
  49. GRB 081127: Swift-XRT refined analysis
  50. GRB 081127: Enhanced Swift-XRT position
  51. GRB 081126: Confirmation of the Optical Afterglow
  52. GRB 081127: Swift-BAT refined analysis
  53. Konus-Wind observation of GRB 081126
  54. GRB 081126: Swift-XRT refined analysis
  55. GRB 081127: Swift detection of a burst
  56. GRB 081126: Swift/UVOT Observations
  57. GRB 081126: optical observations
  58. GRB 081126: Swift-BAT refined analysis
  59. GRB 081126: Enhanced Swift-XRT position
  60. GRB 081126: TAROT Calern observatory optical observations
  61. GRB 081126: Swift detection of a burst
  62. GRB 081125: Fermi GBM detection
  63. GRB 081124: Fermi GBM detection
  64. GRB 081120: Fermi GBM detection
  65. GRB 081118: Fermi GBM detection.
  66. GRB 081122: Fermi GBM detection
  67. Konus-Wind observation of GRB 081121
  68. GRB 081121, SMARTS optical/IR afterglow observations
  69. GRB081121: Fermi GBM detection
  70. Fermi GBM detection of a weak source
  71. GRB081121: Refined Swift/UVOT observations
  72. GRB 081121: Swift-XRT refined analysis
  73. GRB 081121: Magellan Redshift
  74. GRB 081121: Enhanced Swift-XRT position
  75. GRB 081121: GROND observations
  76. GRB 081121: Swift-BAT refined analysis
  77. GRB081121: Swift/UVOT observations
  78. GRB 081121: Swift detection of a burst
  79. GRB 081121: ROTSE-III Detection of Optical Counterpart
  80. GRB 081016b, SMARTS optical/IR observations
  81. GRB 081119: Fermi GBM detection
  82. VLA Radio upper limit on GRB 081118
  83. GRB 081118: VLT redshift
  84. GRB 081118: Swift-XRT refined analysis
  85. GRB 081118: GROND detection of afterglow
  86. GRB 081118: Swift UVOT Upper Limits
  87. GRB 081118: Swift-BAT refined analysis
  88. GRB 081118: Enhanced Swift-XRT position
  89. GRB 081118: Swift detection of a burst
  90. GRB 081109A: confirmation of possible detection host galaxy
  91. Further Swift-XRT observations of the probable GRB 081105.
  92. GRB 081113: Fermi GBM detection
  93. GRB 081110: Fermi GBM detection
  94. GRB 081110: MASTER: first optical observations Fermi GRB
  95. GRB 081109: TAROT La Silla observatory optical observations
  96. GRB 081102: MASTER refind and final results
  97. GRB 081109: GROND redshift limit and host extinction
  98. GRB 081024B: Swift-XRT late-time observations
  99. Swift-BAT refined analysis of trigger 334129
  100. GRB 081109B: Swift/UVOT refined analysis

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