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"

21263 results found.

  1. GRB091020 Swift/UVOT observations
  2. GRB 091020: Enhanced Swift-XRT position
  3. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  4. GRB 091020: Swift detection of a burst with an optical afterglow
  5. GRB 091018: Skynet/PROMPT Observations of Fading
  6. Konus-RF observation of GRB 091018
  7. GRB 091018 : Faulkes Telescope South Observations
  8. GRB 091018: BOOTES-3 observations
  9. GRB091018: Swift/UVOT observations
  10. GRB 091018: Swift-BAT refined analysis
  11. GRB 091018: Enhanced Swift-XRT position
  12. GRB 091015: Skynet/PROMPT Observations
  13. GRB 091018: Swift detection of a burst with optical afterglow
  14. GRB 091010: optical obsevation
  15. GRB 091010: Swift-XRT refined analysis
  16. GRB 091010: Suzaku WAM observation of the prompt emission
  17. Radio observation of GRB090927 with ATCA
  18. Radio observation of GRB090926a with ATCA
  19. Radio observation of GRB080916c with ATCA
  20. GRB 091010: Fermi GBM observation
  21. GRB 090531A: Skynet/PROMPT Observations
  22. GRB 091010: Enhanced XRT position
  23. GRB 091010 optical upper limits
  24. Detection of a short GRB 090929A by RT-2 Experiment
  25. GRB 091010: GROND afterglow candidate
  26. GRB 091010: Swift/UVOT Upper Limits
  27. GRB 090518: Skynet/PROMPT Observations
  28. GRB 090904A: afterglow confirmation
  29. GRB 090812: Skynet/PROMPT and GORT Observations
  30. GRB 091003A: Suzaku WAM observation of the prompt emission
  31. GRB 090926B: Skynet/PROMPT Observations
  32. GRB 091003: WHT ACAM observations
  33. Konus-Wind observation of GRB 091003A
  34. GRB 090929B: Suzaku WAM observation of the prompt emission
  35. GRB 090929A: Suzaku WAM observation of the prompt emission
  36. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  37. GRB 091003: UVOT-enhanced XRT position
  38. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  39. GRB 091003A: Fermi LAT detection
  40. GRB 090929A, Swift-BAT refined analysis
  41. GRB 090929B, Swift-BAT refined analysis
  42. Trigger 371210: Swift/BAT Triggered on IGR J17511-3057
  43. Konus-Wind observation of GRB 090929A
  44. Konus-Wind observation of GRB 090929B
  45. GRB 090929B: Gemini-N upper limits
  46. GRB 090929B: Swift/UVOT Observations
  47. Konus-RF observation of GRB 090929A
  48. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  49. Correction: GRB 090929B: Enhanced Swift-XRT position
  50. GRB 090929: Enhanced Swift-XRT position
  51. GRB 090929B: Swift detection of a burst
  52. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  53. Konus-Wind and Konus-RF observations of GRB 090926A
  54. GRB 090927: Zadko Telescope observations
  55. Swift/UVOT observations of GRB 090927
  56. GRB 090927: Swift XRT refined analysis
  57. GRB 090926A: Suzaku WAM observation of the prompt emission
  58. GRB 090927: Enhanced Swift-XRT position
  59. GRB090926B: Swift/UVOT Upper Limits
  60. GRB090926A: Swift/UVOT observations
  61. GRB 090926B: optical object in error circle
  62. GRB 090926B: NOT optical observation
  63. GRB 090926B: Swift XRT refined analysis
  64. GRB 090926A: Swift/UVOT detection of an optical afterglow
  65. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  66. GRB090926A: UVOT-enhanced XRT position
  67. GRB 090926B: Swift detection of a burst
  68. GRB 090926: Fermi LAT detection
  69. GRB 090715B: Skynet/PROMPT Detections
  70. GRB 090916: Swift-XRT upper limit
  71. GRB 090915: GROND upper limits
  72. Short-Duration GRB 090916: Skynet/PROMPT Observations
  73. GRB 090915: SARA detection of afterglow candidate
  74. GRB 090912: optical observation
  75. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  76. GRB 090902B: Skynet/PROMPT Observations
  77. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  78. GRB 090915 Swift-BAT detection of a burst in ground analysis
  79. GRB 090827: Confirmation of the X-ray afterglow
  80. GRB 090912: Swift/UVOT Upper Limits
  81. GRB 090912 optical upper limit
  82. GRB 090912: Enhanced Swift-XRT position
  83. GRB 090912: Swift detection of a burst
  84. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  85. GRB 090904B: GROND detection of the optical afterglow
  86. GRB 090831A: Suzaku WAM observation of the prompt emission
  87. GRB 090904B: Swift/UVOT Refined Analysis
  88. GRB 090902B: Suzaku WAM observation of the prompt emission
  89. GRB 090829A: Suzaku WAM observation of the prompt emission
  90. GRB 090904A: Enhanced Swift XRT position
  91. GRB 090904B: Swift-BAT refined analysis
  92. GRB 090902B: VLA radio detection
  93. GRB 090904A: Swift-BAT refined analysis
  94. GRB 090904B: Enhanced Swift-XRT position
  95. GRB 090904A: Enhanced Swift-XRT position
  96. GRB 090904A: NOT observations
  97. GRB090904B: REM observations
  98. GRB 090904B: Swift detection of a burst
  99. GRB 090904A: ROTSE-III Optical Limits
  100. GRB 090904: Swift detection of a burst

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