Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

44457 results found.

  1. GRB 081211: Swift XRT refined analysis
  2. GRB 081211: Swift/UVOT detection of an optical afterglow
  3. GRB 081211: Enhanced Swift-XRT position
  4. GRB 081210: Swift/UVOT refined analysis
  5. GRB 081211: Swift detection of a burst
  6. GRB 081210: Swift-XRT refined analysis
  7. GRB081203B: optical observations
  8. GRB 081210: Enhanced Swift-XRT position
  9. GRB 081210: Swift-BAT refined analysis
  10. GRB 081210: Swift detection of a burst with optical afterglow
  11. Konus-Wind observation of GRB 081209
  12. IPN triangulation of short hard GRB 081209
  13. GRB 081203A: optical observations
  14. GRB 081206C: Fermi GBM detection
  15. Radio observation of GRB 081121 with ATCA
  16. Radio observation of GRB 081118 with ATCA
  17. GRB 081206B: Fermi GBM detection
  18. GRB 081206: Fermi GBM detection
  19. GRB 081128: afterglow observations
  20. GRB 081203B: Suzaku WAM observation of the prompt emission
  21. GRB 081203B: Additional Gemini imaging
  22. Radio observation of GRB 081109 with ATCA
  23. Radio observation of GRB 081104 with ATCA
  24. Radio observation of GRB 081029 with ATCA
  25. Radio observation of GRB 081008 with ATCA
  26. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  27. GRB 081203B: Gemini observations
  28. GRB 081128: optical observation in CrAO
  29. GRB081203A: Optical observations at Ishigaki
  30. GRB 081128: Optical afterglow observations
  31. GRB 081204: GROND Observations
  32. GRB081203B: optical observations
  33. Radio detection of GRB 081203B with the VLA
  34. GRB 081204: Magellan observations
  35. GRB081203A: Radio upper limit at 15 GHz
  36. GRB 081204B: Fermi GBM detection
  37. GRB 081204: Swift/UVOT Upper Limits
  38. GRB 081204: Swift XRT afterglow confirmation
  39. GRB081203A: MITSuME optical observation
  40. GRB 081203A: Optical observations of Xinglong TNT telescope
  41. GRB 081203A: Skynet/GORT Detections
  42. GRB 081204: Swift XRT afterglow candidate
  43. GRB081203A: optical observation
  44. GRB 081204 : a long GRB localized by INTEGRAL
  45. VLA Radio upper limit on GRB 081203A
  46. Swift-XRT observations of GRB 081203B
  47. Konus-Wind observation of GRB 081203A
  48. Konus-Wind observation of GRB 081203B
  49. GRB081203A: Swift-XRT refined analysis
  50. GRB 081203B: optical observations
  51. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  52. Swift/UVOT detection of GRB081203B
  53. GRB 081203B: Swift-XRT candidate afterglow.
  54. GRB 081203A: optical observations
  55. Swift UVOT observations of GRB 081203A
  56. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  57. GRB081203A: Swift/UVOT grism redshift
  58. GRB 081203A: Burst detection from Swift-BAT slew data
  59. GRB 081203A: Swift-BAT refined analysis
  60. GRB 081203: Enhanced Swift-XRT position
  61. GRB 081130B: MASTER prompt optical observations
  62. GRB081203: optical observation
  63. GRB 081203: Swift detection of a burst with a bright optical counterpart
  64. GRB 081128: optical observation
  65. GRB 081130B: Fermi GBM detection
  66. GRB 081130: Fermi GBM detection
  67. Swift Trigger 335971: Swift/UVOT Observations
  68. GRB 081126: afterglow photometry
  69. GRB 081126: Fermi GBM detection
  70. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  71. VLA Radio upper limit on GRB 081126
  72. GRB 081129: Fermi GBM detection
  73. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  74. GRB 081128A: optical observations
  75. Swift Trigger 335971 is probably not a real source
  76. Trigger 335971: Swift possible detection of a burst
  77. GRB081128: Swift/UVOT Upper Limits
  78. SGR 1806-20: Fermi GBM detection.
  79. GRB 081122B: Fermi GBM Detection
  80. GRB 081128: Swift-XRT refined analysis
  81. GRB 081128: Liverpool Telescope afterglow confirmation
  82. GRB081128: optical observations
  83. GRB081128 : Lulin optical follow-ups
  84. GRB 081128: Swift-BAT refined analysis
  85. GRB 081128: Enhanced Swift-XRT position
  86. GRB 081128: Optical observation of xinglong TNT
  87. GRB 081128: Swift detection of a burst
  88. GRB 081126: Swift observations continuing
  89. GRB081126: Afterglow photometry from Crni Vrh
  90. GRB 081126: GRT Optical Observation
  91. GRB 081127: Swift/UVOT Upper Limits
  92. GRB 081127: Swift-XRT refined analysis
  93. GRB 081127: Enhanced Swift-XRT position
  94. GRB 081126: Confirmation of the Optical Afterglow
  95. GRB 081127: Swift-BAT refined analysis
  96. Konus-Wind observation of GRB 081126
  97. GRB 081126: Swift-XRT refined analysis
  98. GRB 081127: Swift detection of a burst
  99. GRB 081126: Swift/UVOT Observations
  100. GRB 081126: optical observations

Advanced

Download all Circulars as a .tar.gz archive:
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