Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

19356 results found.

  1. GRB 130831A: Swift/UVOT Observations
  2. GRB 130831A: Montarrenti Observatory optical follow-up
  3. GRB 130831A: RATIR Optical and NIR Observations
  4. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  5. GRB 130831B, Swift-BAT refined analysis
  6. GRB 130831A: VLA Observations
  7. GRB 130831A: T100 observations
  8. GRB 130831B: Swift/UVOT Upper Limits
  9. GRB 130831B: GROND upper limits
  10. Swift Trigger 569022: a possible GRB
  11. GRB 130831A: THO optical observation
  12. GRB 130831A, Swift-BAT refined analysis
  13. GRB 130831B: Swift-XRT refined Analysis
  14. GRB 130831A: Swift-XRT refined Analysis
  15. GRB 130831A: Montarrenti Observatory optical observations
  16. GRB 130831B: Enhanced Swift-XRT position
  17. GRB 130831A: Skynet/PROMPT-SSO detections
  18. GRB 130831A: Enhanced Swift-XRT position
  19. Konus-Wind observation of GRB 130831A
  20. GRB 130831B: Swift detection of a burst
  21. GRB 130831A: Faulkes Telescope North and South optical afterglow
  22. GRB 130831A: Swift detection of a burst with an optical counterpart
  23. IPN triangulation of GRB 130828A - error box
  24. GRB 130822A: optical upper limits
  25. GRB 130829A: AAO optical observations
  26. GRB 130828A: Swift XRT and UVOT observations
  27. IPN triangulation of GRB 130828A
  28. GRB 130829A: Swift detection of a burst
  29. GRB 130828A Tiled Swift observations
  30. IPN triangulation of GRB130821A
  31. GRB 130822A Swift-BAT Spectral lag analysis
  32. GRB 130821A: Swift-XRT observation
  33. GRB 130822A: Gemini Observations
  34. GRB 130822A: Swift-XRT refined Analysis
  35. GRB 130822A: Swift/UVOT Upper Limits
  36. GRB 130822A: Enhanced Swift-XRT position
  37. GRB 130822A, Swift-BAT refined analysis
  38. GRB 130821A: Fermi-LAT detection of a burst
  39. GRB 130822A: Swift detection of a short burst
  40. GRB 130816A: Swift/UVOT Upper Limits
  41. GRB 130816B: Swift/UVOT Upper Limits
  42. GRB 130816B, Swift-BAT refined analysis
  43. GRB 130816B: GROND afterglow candidate
  44. GRB 130816A: Swift-XRT refined Analysis
  45. GRB 130816A, Swift-BAT refined analysis
  46. GRB 130816A: Fermi GBM observation
  47. GRB 130816B: Swift-XRT refined Analysis
  48. GRB 130816B: Enhanced Swift-XRT position
  49. GRB 130816A: GROND confirmation of afterglow
  50. GRB 130816A: Enhanced Swift-XRT position
  51. GRB 130816B: Swift detection of a burst
  52. GRB 130816A: Swift detection of a burst
  53. Refined IPN Triangulation of GRB 130812B
  54. IPN Triangulation of GRB 130812B (long/soft)
  55. GRB 130812A: Swift/UVOT Upper Limits
  56. GRB 130812A, Swift-BAT refined analysis
  57. GRB 130812A: GROND upper limits
  58. GRB 130812A: Swift-XRT refined Analysis
  59. GRB 130812A: Enhanced Swift-XRT position
  60. GRB 130812A: Swift detection of a burst
  61. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  62. GRB130807A: Swift/UVOT observations
  63. GRB 130807A: Swift-XRT refined analysis
  64. GRB 130806A: Swift/UVOT Upper Limits
  65. GRB 130807A, Swift-BAT refined analysis
  66. GRB 130807A: Swift detection of a GRB or Galactic transient
  67. GRB 130623A: GROND detection of the optical/NIR afterglow
  68. GRB 130806A: Swift-XRT refined Analysis
  69. GRB 130806A, Swift-BAT refined analysis
  70. IPN localization of GRB 130804A
  71. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  72. GRB130803A: GROND observations
  73. GRB 130806A: Enhanced Swift-XRT position
  74. GRB 130806A: Swift detection of a burst
  75. Trigger 565443: Swift detection of a burst from SGR J1745-29
  76. GRB 130803A: Swift-XRT refined Analysis
  77. GRB 130803A: RATIR Optical and NIR Observations
  78. GRB130803A: GROND detection of possible host
  79. GRB 130803A: Swift/UVOT Upper Limits
  80. GRB 130803A; Fermi GBM observation
  81. GRB 130803A, Swift-BAT refined analysis
  82. GRB 130803A: Enhanced Swift-XRT position
  83. GRB 130803A: Faulkes Telescope South Observations
  84. GRB 130803A: Swift detection of a burst
  85. GRB 130727A: Watcher optical limit
  86. GRB 130727A: Swift/UVOT Detection
  87. Konus-Wind observation of GRB 130727A
  88. GRB 130727A: Swift-XRT refined Analysis
  89. GRB 130727A: Fermi GBM detection
  90. GRB 130727A: GROND observations
  91. GRB 130727A: Enhanced Swift-XRT position
  92. GRB 130727A: Swift-BAT refined analysis
  93. GRB 130727A: Swift-XRT observations
  94. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  95. GRB 130727A: Swift detection of a burst
  96. GRB 130725B: Swift/UVOT Observations
  97. GRB 130725B: Swift trigger time correction
  98. GRB 130725A: Swift-XRT refined Analysis
  99. GRB 130725B, Swift-BAT refined analysis
  100. GRB 130725B: Swift-XRT refined Analysis

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