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"

28258 results found.

  1. GRB 130907A: WSRT radio detection
  2. GRB 130828A: Further Swift XRT observations
  3. GRB 130907A, Swift-BAT refined analysis
  4. GRB 130907A: T21 optical observations
  5. GRB 130907A: VLA detection
  6. GRB 130907A: Swift-XRT refined Analysis
  7. GRB 130907A: Enhanced Swift-XRT position
  8. Errata of GRB name in GCN 15196: should have been GRB 130907A instead of GRB 120916A
  9. GRB 120916A: Fermi-LAT detection of a burst
  10. GRB 130907A: Swift/UVOT Detection
  11. GRB 130907A: Early Tautenburg detections, red afterglow
  12. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  13. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  14. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  15. GRB 130831A: Maidanak optical observations
  16. GRB 130831A: optical observation in Chuguev AO
  17. GRB 130831A: ISON-Kislovodsk optical observations
  18. GRB 130907A: NOT redshift
  19. GRB 130831A: optical observation in Gissar AO
  20. GRB 130831A: ISON-UAFO optical observations
  21. GRB 130907A: Swift detection of a burst with an optical counterpart
  22. Swift follow-up results of the possible weak INTEGRAL GRB
  23. GRB 130903A: Swift/UVOT Upper Limits
  24. Swift follow-up of an INTEGRAL possible weak GRB
  25. GRB 130831A: RATIR Optical and NIR Upper Limits
  26. GRB 130822A: nearby galaxy redshifts
  27. GRB 130903A: GROND Afterglow Discovery
  28. GRB 130903A: Fermi GBM observation
  29. GRB 130903A: Swift-XRT observations
  30. Swift trigger 569022 is a new Galactic source Swift J1734.5-3027
  31. GRB 130831A: Swift/UVOT Observations
  32. GRB 130831A: Montarrenti Observatory optical follow-up
  33. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  34. GRB 130831A: RATIR Optical and NIR Observations
  35. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  36. GRB 130831A: VLA Observations
  37. GRB 130831B: Swift/UVOT Upper Limits
  38. GRB 130831B: GROND upper limits
  39. Swift Trigger 569022: a possible GRB
  40. GRB 130831A: THO optical observation
  41. GRB 130831B: Swift-XRT refined Analysis
  42. GRB 130831A: optical observations
  43. GRB 130831A: Swift-XRT refined Analysis
  44. GRB 130831A: Montarrenti Observatory optical observations
  45. GRB 130831B: Enhanced Swift-XRT position
  46. GRB 130831A: Skynet/PROMPT-SSO detections
  47. GRB 130831A: Enhanced Swift-XRT position
  48. GRB 130831A: Gemini-North Redshift
  49. GRB 130831A: MITSuME Akeno Optical observation
  50. GRB 130831A: Weihai optical observations
  51. GRB 130831B: Swift detection of a burst
  52. GRB 130831A: Faulkes Telescope North and South optical afterglow
  53. GRB 130831A: Swift detection of a burst with an optical counterpart
  54. IPN triangulation of GRB 130828A - error box
  55. GRB 130822A: optical upper limits
  56. GRB 130828A: Swift XRT and UVOT observations
  57. GRB 130829A: Swift detection of a burst
  58. GRB 130828A Tiled Swift observations
  59. GRB 130828A: Fermi GBM detection
  60. GRB 130828A: Fermi-LAT detection of a burst
  61. IPN triangulation of GRB130821A
  62. Konus-Wind observation of GRB 130821A
  63. GRB 130821A: Weihai optical upper limit
  64. GRB 130821A: Swift-XRT observation
  65. GRB 130822A: 5.8 GHz VLA upper limit
  66. GRB 130822A: Gemini Observations
  67. GRB 130822A: Swift-XRT refined Analysis
  68. GRB 130822A: WHT ACAM observations
  69. GRB 130822A: Swift/UVOT Upper Limits
  70. GRB 130822A: Enhanced Swift-XRT position
  71. GRB 130821A: Fermi-LAT detection of a burst
  72. GRB 130822A: Weihai optical upper limit
  73. GRB 130821A: Fermi GBM Detection
  74. GRB 130822A: Swift detection of a short burst
  75. GRB 130816A: Swift/UVOT Upper Limits
  76. GRB 130816B: Swift/UVOT Upper Limits
  77. GRB 130816B: GROND afterglow candidate
  78. GRB 130816A: Swift-XRT refined Analysis
  79. GRB 130816B: Swift-XRT refined Analysis
  80. GRB 130816B: Enhanced Swift-XRT position
  81. GRB 130816A: GROND confirmation of afterglow
  82. GRB 130816A: Enhanced Swift-XRT position
  83. GRB 130816B: Swift detection of a burst
  84. GRB 130816A: REM NIR candidate afterglow
  85. GRB 130816A: Swift detection of a burst
  86. GRB 130812A: Swift/UVOT Upper Limits
  87. GRB 130812A: GROND upper limits
  88. GRB 130812A: Swift-XRT refined Analysis
  89. GRB 130812A: Enhanced Swift-XRT position
  90. GRB 130812A: Swift detection of a burst
  91. GRB130807A: Swift/UVOT observations
  92. GRB 130807A: Swift-XRT refined analysis
  93. GRB 130806A: Swift/UVOT Upper Limits
  94. GRB 130807A, Swift-BAT refined analysis
  95. GRB 130807A: Swift detection of a GRB or Galactic transient
  96. Konus-Wind observation of GRB 130804A
  97. GRB 130623A: GROND detection of the optical/NIR afterglow
  98. GRB 130806A: MITSuME Akeno Optical observation
  99. GRB 130806A: Swift-XRT refined Analysis
  100. GRB 130806A: MITSuME Okayama upper limits

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