Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

26682 results found.

  1. RT-2 observation of the bright GRB 090926A
  2. GRB 091010: GROND afterglow candidate
  3. GRB 091010: Swift/UVOT Upper Limits
  4. GRB 090910: SuperAGILE Localization of a Long GRB
  5. GRB 090518: Skynet/PROMPT Observations
  6. GRB 090904A: afterglow confirmation
  7. GRB 090812: Skynet/PROMPT and GORT Observations
  8. GRB 091003A: Suzaku WAM observation of the prompt emission
  9. GRB 090926B: Skynet/PROMPT Observations
  10. GRB 091003: WHT ACAM observations
  11. Konus-Wind observation of GRB 091003A
  12. GRB 090929B: Suzaku WAM observation of the prompt emission
  13. GRB 090929A: Suzaku WAM observation of the prompt emission
  14. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  15. GRB 091003: UVOT-enhanced XRT position
  16. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  17. GRB 091003: Swift XRT analysis
  18. GRB 091003A: Fermi LAT detection
  19. GRB 091003A: Fermi GBM detection
  20. GRB 090929A, Swift-BAT refined analysis
  21. GRB 090929B, Swift-BAT refined analysis
  22. Trigger 371210: Swift/BAT Triggered on IGR J17511-3057
  23. GRB 090929A: Swift-XRT non-detection
  24. Konus-Wind observation of GRB 090929A
  25. GRB 090927: Fermi GBM observation
  26. GRB 090929B: Swift-XRT refined analysis
  27. GRB 090926A: Fermi LAT and GBM refined analysis
  28. GRB 090929B: Gemini-N upper limits
  29. GRB 090929B: Swift/UVOT Observations
  30. Konus-RF observation of GRB 090929A
  31. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  32. GRB 090929A BAT location of the Fermi GBM burst
  33. Correction: GRB 090929B: Enhanced Swift-XRT position
  34. GRB 090929: Enhanced Swift-XRT position
  35. GRB 090929B: Swift detection of a burst
  36. GRB 090929A: Fermi GBM detection
  37. GRB090926A: Swift-XRT refined analysis
  38. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  39. GRB 090926B: Fermi GBM detection
  40. GRB 090927: Zadko Telescope observations
  41. Swift/UVOT observations of GRB 090927
  42. GRB 090927: Swift XRT refined analysis
  43. GRB 090927: Enhanced Swift-XRT position
  44. GRB090926B: Swift/UVOT Upper Limits
  45. GRB090926A: Swift/UVOT observations
  46. GRB 090926B: optical object in error circle
  47. GRB 090926B: MAXI GSC detection
  48. GRB 090926B: NOT optical observation
  49. GRB 090926B: Swift XRT refined analysis
  50. GRB 090926A: Swift/UVOT detection of an optical afterglow
  51. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  52. GRB090926A: UVOT-enhanced XRT position
  53. GRB 090926B: Swift detection of a burst
  54. GRB 090926: Fermi LAT detection
  55. GRB 090926: Fermi GBM detection
  56. GRB 090925: Fermi GBM detection
  57. GRB090922A: correction to Fermi location
  58. GRB 090922A: Fermi GBM detection
  59. GRB 090916: Swift-XRT upper limit
  60. GRB 090915: GROND upper limits
  61. Short-Duration GRB 090916: Skynet/PROMPT Observations
  62. GRB 090915: SARA detection of afterglow candidate
  63. GRB 090912: optical observation
  64. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  65. GRB 090702: Skynet/GORT Observations
  66. GRB 090902B: Skynet/PROMPT Observations
  67. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  68. GRB 090915 Swift-BAT detection of a burst in ground analysis
  69. GRB 090827: Confirmation of the X-ray afterglow
  70. GRB 090912: Swift-XRT refined analysis
  71. GRB 090912: Swift/UVOT Upper Limits
  72. GRB 090912 optical upper limit
  73. GRB 090912: Enhanced Swift-XRT position
  74. GRB 090912: Swift detection of a burst
  75. GRB 090910: Fermi GBM detection
  76. GRB 090814A: Skynet/DSO & GORT Observations
  77. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  78. GRB 090904B: GROND detection of the optical afterglow
  79. GRB 090831A: Suzaku WAM observation of the prompt emission
  80. GRB 090904B: Swift/UVOT Refined Analysis
  81. GRB 090902B: Suzaku WAM observation of the prompt emission
  82. GRB 090829A: Suzaku WAM observation of the prompt emission
  83. GRB 090904B: Fermi GBM detection
  84. GRB 090904A: Swift-XRT refined analysis
  85. GRB 090904B: Swift XRT Refined Analysis
  86. GRB 090902B: VLA radio detection
  87. GRB 090904B: Enhanced Swift-XRT position
  88. GRB 090904A: Enhanced Swift-XRT position
  89. GRB 090904A: NOT observations
  90. GRB090904B: REM observations
  91. GRB 090904B: Swift detection of a burst
  92. GRB 090904: Swift detection of a burst
  93. GRB 090902B: ROTSE-III Detection of Optical Afterglow
  94. GRB 090902B: Swift/UVOT refined analysis
  95. GRB090902B: Swift XRT refined analysis
  96. GRB 090902B: GROND NIR Afterglow Observations
  97. GRB 090902B: Enhanced Swift-XRT position
  98. GRB090902B: Swift/UVOT observations
  99. GRB 090902B: Swift/XRT Afterglow Candidate
  100. GRB 090902B: Fermi LAT detection

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