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"

19662 results found.

  1. GRB 130907A: MASTER early OT observations
  2. GRB 130907A: Swift detection of a burst with an optical counterpart
  3. Swift follow-up results of the possible weak INTEGRAL GRB
  4. GRB 130903A: Swift/UVOT Upper Limits
  5. Swift follow-up of an INTEGRAL possible weak GRB
  6. GRB 130831A: RATIR Optical and NIR Upper Limits
  7. GRB 130903A: Fermi GBM observation
  8. GRB 130903A: Swift-XRT observations
  9. Swift trigger 569022 is a new Galactic source Swift J1734.5-3027
  10. GRB 130831A: Swift/UVOT Observations
  11. GRB 130831A: Montarrenti Observatory optical follow-up
  12. GRB 130831A: RATIR Optical and NIR Observations
  13. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  14. GRB 130831B, Swift-BAT refined analysis
  15. GRB 130831A: VLA Observations
  16. GRB 130831A: T100 observations
  17. GRB 130831B: Swift/UVOT Upper Limits
  18. GRB 130831B: GROND upper limits
  19. Swift Trigger 569022: a possible GRB
  20. GRB 130831A: THO optical observation
  21. GRB 130831A, Swift-BAT refined analysis
  22. GRB 130831B: Swift-XRT refined Analysis
  23. GRB 130831A: Swift-XRT refined Analysis
  24. GRB 130831A: Montarrenti Observatory optical observations
  25. GRB 130831B: Enhanced Swift-XRT position
  26. GRB 130831A: Skynet/PROMPT-SSO detections
  27. GRB 130831A: Enhanced Swift-XRT position
  28. Konus-Wind observation of GRB 130831A
  29. GRB 130831B: Swift detection of a burst
  30. GRB 130831A: Faulkes Telescope North and South optical afterglow
  31. GRB 130831A: Swift detection of a burst with an optical counterpart
  32. IPN triangulation of GRB 130828A - error box
  33. GRB 130822A: optical upper limits
  34. GRB 130829A: AAO optical observations
  35. GRB 130828A: Swift XRT and UVOT observations
  36. IPN triangulation of GRB 130828A
  37. GRB 130829A: Swift detection of a burst
  38. GRB 130828A Tiled Swift observations
  39. IPN triangulation of GRB130821A
  40. GRB 130822A Swift-BAT Spectral lag analysis
  41. GRB 130821A: Swift-XRT observation
  42. GRB 130822A: Gemini Observations
  43. GRB 130822A: Swift-XRT refined Analysis
  44. GRB 130822A: Swift/UVOT Upper Limits
  45. GRB 130822A: Enhanced Swift-XRT position
  46. GRB 130822A, Swift-BAT refined analysis
  47. GRB 130821A: Fermi-LAT detection of a burst
  48. GRB 130822A: Swift detection of a short burst
  49. GRB 130816A: Swift/UVOT Upper Limits
  50. GRB 130816B: Swift/UVOT Upper Limits
  51. GRB 130816B, Swift-BAT refined analysis
  52. GRB 130816B: GROND afterglow candidate
  53. GRB 130816A: Swift-XRT refined Analysis
  54. GRB 130816A, Swift-BAT refined analysis
  55. GRB 130816A: Fermi GBM observation
  56. GRB 130816B: Swift-XRT refined Analysis
  57. GRB 130816B: Enhanced Swift-XRT position
  58. GRB 130816A: GROND confirmation of afterglow
  59. GRB 130816A: Enhanced Swift-XRT position
  60. GRB 130816B: Swift detection of a burst
  61. GRB 130816A: Swift detection of a burst
  62. Refined IPN Triangulation of GRB 130812B
  63. IPN Triangulation of GRB 130812B (long/soft)
  64. GRB 130812A: Swift/UVOT Upper Limits
  65. GRB 130812A, Swift-BAT refined analysis
  66. GRB 130812A: GROND upper limits
  67. GRB 130812A: Swift-XRT refined Analysis
  68. GRB 130812A: Enhanced Swift-XRT position
  69. GRB 130812A: Swift detection of a burst
  70. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  71. GRB130807A: Swift/UVOT observations
  72. GRB 130807A: Swift-XRT refined analysis
  73. GRB 130806A: Swift/UVOT Upper Limits
  74. GRB 130807A, Swift-BAT refined analysis
  75. GRB 130807A: Swift detection of a GRB or Galactic transient
  76. GRB 130623A: GROND detection of the optical/NIR afterglow
  77. GRB 130806A: Swift-XRT refined Analysis
  78. GRB 130806A, Swift-BAT refined analysis
  79. IPN localization of GRB 130804A
  80. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  81. GRB130803A: GROND observations
  82. GRB 130806A: Enhanced Swift-XRT position
  83. GRB 130806A: Swift detection of a burst
  84. Trigger 565443: Swift detection of a burst from SGR J1745-29
  85. GRB 130803A: Swift-XRT refined Analysis
  86. GRB 130803A: RATIR Optical and NIR Observations
  87. GRB130803A: GROND detection of possible host
  88. GRB 130803A: Swift/UVOT Upper Limits
  89. GRB 130803A; Fermi GBM observation
  90. GRB 130803A, Swift-BAT refined analysis
  91. GRB 130803A: Enhanced Swift-XRT position
  92. GRB 130803A: Faulkes Telescope South Observations
  93. GRB 130803A: Swift detection of a burst
  94. GRB 130727A: Watcher optical limit
  95. GRB 130727A: Swift/UVOT Detection
  96. Konus-Wind observation of GRB 130727A
  97. GRB 130727A: Swift-XRT refined Analysis
  98. GRB 130727A: Fermi GBM detection
  99. GRB 130727A: GROND observations
  100. GRB 130727A: Enhanced Swift-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