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"

19710 results found.

  1. GRB 131024B: RATIR Optical and NIR Observations
  2. GRB 131024B: Swift/UVOT Upper Limits
  3. GRB 131024B: Swift-XRT refined Analysis
  4. GRB 131024B: Nanshan optical upper limit
  5. GRB 131024A: Swift/UVOT Upper Limits
  6. GRB 131024B: Enhanced Swift-XRT position
  7. GRB 131024A: GROND upper limits
  8. GRB 131024B: Swift detection of a burst
  9. GRB 131024A: Skynet R-COP optical observations
  10. GRB 131024A: Enhanced Swift-XRT position
  11. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  12. GRB 131024A: Swift detection of a burst
  13. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  14. IPN Triangulation of GRB 131014A
  15. GRB 131018B: Swift/UVOT Upper Limits
  16. GRB 131018A: RATIR Optical and NIR Observations
  17. GRB 131018A: Swift/UVOT Upper Limits
  18. GRB 131018A: Enhanced Swift-XRT position
  19. GRB 131014A: XRT position information
  20. GRB131018A, optical observations
  21. GRB 131018A: Swift detection of a burst
  22. GRB 131014A: GROND observations
  23. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  24. GRB 131011A: Swift/UVOT Upper Limits
  25. GRB 131014A: Swift/UVOT Upper Limits
  26. GRB 131014A: RATIR Optical and NIR Observations
  27. GRB 131014A: Enhanced XRT position
  28. GRB 131014A: NOT afterglow candidate
  29. GRB 131014A: Nanshan optical observations
  30. GRB 131014A: Fermi-LAT detection
  31. GRB 131011A: GROND afterglow observations
  32. Fermi403206457: continued P60 observations and fading behavior
  33. Fermi403206457: Weihai optical upper limit
  34. Trigger 574266 is not a Swift detection of a known source
  35. GRB 130831A: Continued RATIR Optical and NIR Observations
  36. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  37. GRB 131004A: Swift/UVOT Detection
  38. GRB 131004A: RATIR Optical and NIR Upper Limits
  39. GRB 131004A: GROND observations of the afterglow
  40. GRB 131004A: Enhanced Swift-XRT position
  41. GRB 131004A: Liverpool Telescope optical afterglow observations
  42. GRB 131004A: TNG optical afterglow confirmation
  43. GRB 131004A: optical afterglow from the NOT
  44. GRB 131004A: Swift detection of a burst (may be short)
  45. GRB 131002B: GROND upper limits
  46. GRB 131002B: Swift/UVOT Upper Limits
  47. GRB 131002A: Swift/UVOT Detection
  48. GRB 131002B: Enhanced Swift-XRT position
  49. Swift J1242.9-3530, Swift-BAT refined analysis
  50. GRB 131001A: Swift UVOT and XRT Upper Limits
  51. GRB 131002A: Enhanced Swift-XRT position
  52. GRB 131002B: Swift detection of a burst
  53. GRB 131002A: Swift detection of a burst
  54. Swift Operations in the event of a US Government shutdown
  55. GRB 130929A: Swift/UVOT Upper Limits
  56. GRB 130831A: Continued RATIR Optical and NIR Observations
  57. GRB 130929A: Enhanced Swift-XRT position
  58. GRB 130929A: TAROT La Silla observatory optical observations
  59. GRB 130929A: Swift detection of a burst
  60. Fermi LAT Upper Limits on GRB 130925A
  61. GRB 130925A: Swift/UVOT Upper Limits
  62. GRB 130925A: optical upper limit
  63. GRB 130925A: Continued RATIR Optical and NIR Observations
  64. GRB 130925A: RATIR Optical and NIR Observations
  65. GRB 130925A Swift-BAT refined analysis
  66. GRB 130925A: Swift-XRT refined Analysis
  67. GRB 130925A: TAROT La Silla observatory optical observations
  68. GRB 130925A: Enhanced Swift-XRT position
  69. GRB 130925A: VLT/UVES observations
  70. GRB 130925A: GROND afterglow candidate
  71. GRB 130925A: Swift detection of a burst
  72. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  73. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  74. GRB 130903A: optical observations
  75. GRB 130907A: Maidanak optical observations
  76. GRB 130912A: AAO optical upper limit
  77. Fermi Trigger 401326696: MASTER prompt optical observations
  78. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  79. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  80. GRB 130919A, Swift-BAT refined analysis
  81. GRB 130913A detected in ground analysis of Swift-BAT data
  82. GRB 130912A: Swift/UVOT Upper Limits
  83. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  84. GRB 130912A: 5.8 GHz VLA upper limit
  85. GRB 130912A: RATIR Optical and NIR Upper Limits
  86. GRB 130907A: Continued RATIR Optical and NIR Observations
  87. GRB 130912A: P60 Observations
  88. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  89. GRB 130912A: Enhanced Swift-XRT position
  90. GRB 130912A: REM optical/NIR upper limits
  91. GRB 130912A: GROND observations
  92. GRB 130912A: Swift detection of a short burst
  93. GRB 130907A: AMI radio detection
  94. GRB 130907A: Continued RATIR Optical and NIR Observations
  95. GRB 130907A: RATIR Optical and NIR Observations
  96. GRB 130828A: Further Swift XRT observations
  97. GRB 130907A: Further Swift-BAT refined analysis
  98. GRB 130907A: Enhanced Swift-XRT position
  99. GRB 130907A: Swift/UVOT Detection
  100. GRB 130907A: Early Tautenburg detections, red afterglow

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