Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
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"
  1. GRB 130822A: optical upper limits
  2. GRB 130829A: AAO optical observations
  3. GRB 130828A: Swift XRT and UVOT observations
  4. GRB 130829A: NOT optical observations
  5. Correction to GCN 15132 - GRB 130828A
  6. IPN triangulation of GRB 130828A
  7. GRB 130829A: Swift detection of a burst
  8. GRB 130828A Tiled Swift observations
  9. GRB 130828A: Fermi GBM detection
  10. GRB 130828A: Fermi-LAT detection of a burst
  11. IPN triangulation of GRB130821A
  12. GRB 130822A Swift-BAT Spectral lag analysis
  13. Konus-Wind observation of GRB 130821A
  14. GRB 130821A: Weihai optical upper limit
  15. GRB 130821A: Swift-XRT observation
  16. GRB 130822A: 5.8 GHz VLA upper limit
  17. GRB 130822A: Gemini Observations
  18. GRB 130822A: Swift-XRT refined Analysis
  19. GRB 130822A: WHT ACAM observations
  20. GRB 130822A: Swift/UVOT Upper Limits
  21. GRB 130822A: Enhanced Swift-XRT position
  22. GRB 130822A, Swift-BAT refined analysis
  23. GRB 130821A: Fermi-LAT detection of a burst
  24. GRB 130822A: Weihai optical upper limit
  25. GRB 130821A: Fermi GBM Detection
  26. GRB 130822A: Swift detection of a short burst
  27. GRB 130816A: Swift/UVOT Upper Limits
  28. GRB 130816B: Swift/UVOT Upper Limits
  29. Fermi Gamma-ray Burst Monitor trigger 398555975 / 130818916 is not a GRB
  30. GRB 130816B, Swift-BAT refined analysis
  31. GRB 130816B: GROND afterglow candidate
  32. GRB 130816A: Swift-XRT refined Analysis
  33. GRB 130816A, Swift-BAT refined analysis
  34. GRB 130816A: Fermi GBM observation
  35. GRB 130816B: Swift-XRT refined Analysis
  36. GRB 130816B: Enhanced Swift-XRT position
  37. GRB 130816A: GROND confirmation of afterglow
  38. GRB 130816A: Enhanced Swift-XRT position
  39. GRB 130816B: Swift detection of a burst
  40. GRB 130816A: REM NIR candidate afterglow
  41. GRB 130816A: Swift detection of a burst
  42. Refined IPN Triangulation of GRB 130812B
  43. Konus-Wind observation of GRB 130812B
  44. IPN Triangulation of GRB 130812B (long/soft)
  45. GRB 130812A: Swift/UVOT Upper Limits
  46. GRB 130812A, Swift-BAT refined analysis
  47. GRB 130812A: GROND upper limits
  48. GRB 130812A: Swift-XRT refined Analysis
  49. GRB 130812A: Enhanced Swift-XRT position
  50. GRB 130812A: Swift detection of a burst
  51. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  52. GRB130807A: Swift/UVOT observations
  53. GRB 130807A: Swift-XRT refined analysis
  54. GRB 130806A: Swift/UVOT Upper Limits
  55. GRB 130807A, Swift-BAT refined analysis
  56. GRB 130807A: Swift detection of a GRB or Galactic transient
  57. Konus-Wind observation of GRB 130804A
  58. GRB 130623A: GROND detection of the optical/NIR afterglow
  59. GRB 130806A: MITSuME Akeno Optical observation
  60. GRB 130806A: Swift-XRT refined Analysis
  61. GRB 130806A: MITSuME Okayama upper limits
  62. GRB 130806A, Swift-BAT refined analysis
  63. IPN localization of GRB 130804A
  64. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  65. GRB130803A: GROND observations
  66. GRB 130806A: Enhanced Swift-XRT position
  67. GRB 130806A: Swift detection of a burst
  68. GRB 130804A; Fermi GBM observation
  69. Trigger 565443: Swift detection of a burst from SGR J1745-29
  70. GRB 130803A: Swift-XRT refined Analysis
  71. GRB 130803A: RATIR Optical and NIR Observations
  72. GRB130803A: GROND detection of possible host
  73. GRB 130803A: Swift/UVOT Upper Limits
  74. GRB 130803A; Fermi GBM observation
  75. GRB 130803A, Swift-BAT refined analysis
  76. GRB 130803A: Enhanced Swift-XRT position
  77. GRB 130803A: Faulkes Telescope South Observations
  78. GRB 130603B: Second epoch of HST WFC/F160W imaging
  79. GRB 130803A: Swift detection of a burst
  80. GRB 130727A: Watcher optical limit
  81. GRB 130722A: RATIR Optical Observations
  82. GRB 130727A: Swift/UVOT Detection
  83. Konus-Wind observation of GRB 130727A
  84. GRB 130727A: Swift-XRT refined Analysis
  85. GRB 130727A: Fermi GBM detection
  86. GRB 130727A: GROND observations
  87. GRB 130727A: Enhanced Swift-XRT position
  88. GRB 130727A: Faulkes Telescope South optical afterglow
  89. GRB 130727A: Swift-BAT refined analysis
  90. GRB 130727A: Swift-XRT observations
  91. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  92. GRB 130727A: Swift detection of a burst
  93. GRB 130725B: Swift/UVOT Observations
  94. GRB 130725B: Swift trigger time correction
  95. Fermi Gamma-ray Burst Monitor trigger 396484884 / 130725945 is not a GRB
  96. GRB 130725A: Swift-XRT refined Analysis
  97. GRB 130725B, Swift-BAT refined analysis
  98. GRB 130725B: Swift-XRT refined Analysis
  99. GRB130725B: REM-ROS2 optical observations
  100. GRB 130725B - UVOT-enhanced XRT position

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