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"

11503 results found.

  1. Radio observation of GRB 081121 with ATCA
  2. Radio observation of GRB 081118 with ATCA
  3. GRB 081203B: Suzaku WAM observation of the prompt emission
  4. Radio observation of GRB 081109 with ATCA
  5. Radio observation of GRB 081104 with ATCA
  6. Radio observation of GRB 081029 with ATCA
  7. Radio observation of GRB 081008 with ATCA
  8. GRB081203A: Optical observations at Ishigaki
  9. GRB 081128: Optical afterglow observations
  10. GRB 081204: Swift XRT afterglow confirmation
  11. GRB081203A: MITSuME optical observation
  12. GRB 081203A: Skynet/GORT Detections
  13. GRB 081204 : a long GRB localized by INTEGRAL
  14. Konus-Wind observation of GRB 081203A
  15. Konus-Wind observation of GRB 081203B
  16. GRB081203A: Swift-XRT refined analysis
  17. GRB 081128: optical observation
  18. GRB 081126: Fermi GBM detection
  19. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  20. GRB 081128A: optical observations
  21. SGR 1806-20: Fermi GBM detection.
  22. GRB 081128: Swift detection of a burst
  23. Konus-Wind observation of GRB 081126
  24. GRB 081127: Swift detection of a burst
  25. GRB 081126: optical observations
  26. GRB 081120: Fermi GBM detection
  27. GRB 081118: Fermi GBM detection.
  28. Konus-Wind observation of GRB 081121
  29. GRB081121: Fermi GBM detection
  30. GRB 081121: Swift-XRT refined analysis
  31. GRB 081121: Swift detection of a burst
  32. GRB 081121: ROTSE-III Detection of Optical Counterpart
  33. GRB 081118: GROND detection of afterglow
  34. GRB 081118: Swift detection of a burst
  35. GRB 081113: Fermi GBM detection
  36. GRB 081110: Fermi GBM detection
  37. GRB 081109A: Swift-XRT refined analysis
  38. GRB 081109: Swift detection of a burst
  39. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  40. SGR 1806-20: Fermi GBM detection
  41. GRB 081105B: Fermi GBM detection
  42. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  43. Fermi-GBM detection of a Solar Flare
  44. GRB 081102: Swift-BAT refined analysis
  45. GRB 081024B: BTA deep optical observations
  46. GRB 081028B: Fermi GBM detection
  47. GRB 081028, Swift-BAT refined analysis
  48. GRB 081028: Swift detection of a burst
  49. Konus-Wind observation of GRB 081025
  50. Fermi-LAT observation of GRB 081024B
  51. GRB 081024: KAIT Optical Limits
  52. GRB 081024A: ROTSE-III Optical Limits
  53. GRB 081024: Swift detection of a burst
  54. Swift detection of a possible burst (trigger 332287)
  55. GRB 081016B: Swift-XRT Team refined Analysis
  56. GRB 081016B: ROTSE-III Optical Limits
  57. GRB 081016B: Swift detection of a burst
  58. GRB 081016: Swift-XRT candidate afterglow detection
  59. GRB 081016: A long GRB discovered by INTEGRAL
  60. Detection of flare star Algol in Swift-BAT slew data
  61. GRB 081009: Fermi GBM detection
  62. GRB 081012: GROND upper limits
  63. GRB 081012, Swift-BAT refined analysis
  64. GRB 081012: ROTSE-III Optical Limits
  65. GRB 081012: Swift detection of a burst
  66. Konus-Wind observation of GRB 081001
  67. GRB 081008: Gemini-South Absorption Redshiftt
  68. GRB 081008: VLT/FORS2 spectroscopy
  69. GRB081006B: Fermi GBM detection
  70. GRB 081007: Swift detection of a burst with optical afterglow
  71. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  72. GRB081003B: Optical limits from Spain
  73. GRB 081003A: Swift-XRT Team position and analysis
  74. GRB 081003B: a long GRB detected with INTEGRAL
  75. GRB 080928: Fermi GBM detection
  76. GRB 081003: A long GRB discovered by INTEGRAL
  77. GRB081001: SuperAGILE Localization of a long GRB
  78. GRB 080928: VLT redshift
  79. GRB 080928: Swift/UVOT observations
  80. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  81. GRB 080928: Swift detection of a burst with an optical counterpart
  82. GRB 080920: Fermi GBM detection
  83. GRB080922, optical upper limit
  84. Swift detection of a possible GRB (trigger 325707)
  85. GRB080916A: Suzaku WAM observation of the prompt emission
  86. GRB 080922: Swift/UVOT Upper Limits
  87. GRB080922: A long GRB detected by INTEGRAL
  88. Konus-Wind observation of GRB 080916A
  89. Konus-Wind observation of GRB 080916C
  90. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  91. GRB 080916B: Swift-XRT afterglow detection
  92. GRB 080916: REM candidate afterglow
  93. GRB 080916: Swift detection of a burst with optical afterglow
  94. GRB 080915: Swift-XRT afterglow detection and analysis
  95. GRB 080915: ROTSE-III Optical Limits
  96. GRB 080915: Swift detection of a burst
  97. GRB 080913: Swift-XRT refined analysis
  98. GRB 080913: Swift detection of a burst
  99. GRB 080905B: Watcher optical detection
  100. GRB 080905B: Fermi Gamma-ray Burst Monitor detection

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