Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

19663 results found.

  1. GRB 160408A: Swift-XRT refined Analysis
  2. GRB 160408A: Fermi GBM detection
  3. GRB 160408A: Swift-BAT refined analysis
  4. GRB 160408A: Enhanced Swift-XRT position
  5. GRB 160408A: Swift detection of a short burst
  6. IPN Triangulation of GRB 160406A (short/hard)
  7. GRB 160401A: Swift-XRT observations
  8. GRB 160401A: Swift/UVOT Upper Limits
  9. GRB 160401A: Swift ToO observations
  10. GRB 160327A: Early RAPTOR Limits
  11. Konus-Wind observation of GRB 160325A
  12. GRB 160327A: Continued RATIR Optical and NIR Observations
  13. GRB 160327A: KAIT optical afterglow confirmation
  14. GRB 160327A: Mondy optical upper limit
  15. GRB 160327A: Swift-BAT refined analysis
  16. GRB 160327A: Swift/UVOT Upper Limits
  17. GRB 160327A: Swift-XRT refined Analysis
  18. GRB 160327A: Enhanced Swift-XRT position
  19. GRB 160327A: RATIR Optical and NIR Afterglow Detection
  20. GRB 160327A: Swift detection of a burst
  21. GRB 160325A, Swift-BAT refined analysis
  22. GRB 160325A: GROND Upper Limits
  23. GRB 160325A: Swift-XRT refined Analysis
  24. GRB 160325A: Further Swift/UVOT Observations
  25. GRB 160325A: Enhanced Swift-XRT position
  26. GRB160325A Swift/UVOT Detection
  27. GRB 160325A: Fermi-LAT detection
  28. Swift Trigger 680457 is not a GRB
  29. GRB 160325A: Fermi GBM detection
  30. GRB 160325A: Swift detection of a burst
  31. Swift detects GX 301-2 in very high state
  32. GRB 160321A: AbAO optical observations
  33. GRB 160321A: Possible RATIR Optical and NIR Detections
  34. GRB 160321A: Swift/UVOT Upper Limits
  35. GRB 160321A: Swift-BAT refined analysis
  36. GRB 160321A: Swift-XRT refined Analysis
  37. GRB 160321A: Enhanced Swift-XRT position
  38. GRB 160321A: MASTER observations zero Galaxy latitude GRB
  39. GRB 160321A: Swift detection of a probable burst
  40. IPN Triangulation of GRB 160310A
  41. SGR 0755-2933, Swift-BAT refined analysis
  42. GRB 160131A: 15 GHz upper limits from AMI-LA
  43. GRB 160310A: A further Swift-XRT observation, no afterglow detected
  44. Swift detection of a likely new SGR: SGR 0755-2933
  45. GRB 160314A: Continued RATIR Optical and NIR Observations
  46. GRB 160313A: Mondy optical upper limit
  47. GRB 160314A: GROND optical/NIR observations
  48. GRB 160314A: RATIR Optical and NIR Observations
  49. GRB 160313A: Swift/UVOT Upper Limits
  50. GRB 160314A: VLT/X-shooter redshift
  51. GRB 160314A: Swift-XRT refined Analysis
  52. GRB 160314A: Swift-BAT refined analysis
  53. GRB 160314A: Swift/UVOT Detection
  54. GRB 160228A: GROND afterglow confirmation and X-shooter host candidate redshift
  55. GRB 160314A: Enhanced Swift-XRT position
  56. GRB 160314A: Swift detection of a burst
  57. GRB 160313A, Swift-BAT refined analysis
  58. GRB 160313A: Chante-Perdrix Observatory optical observations
  59. GRB 160313A: MASTER-Net optical observations
  60. GRB 160313A: LT observations
  61. GRB 160313A: Swift-XRT refined Analysis
  62. GRB 160313A: TAROT Calern observatory optical observations
  63. GRB 160313A: Enhanced Swift-XRT position
  64. GRB 160313A: RATIR Optical and NIR Observations
  65. GRB 160313A: Swift detection of a burst
  66. GRB 160310A: Swift/UVOT Upper Limits
  67. GRB 160310A: RATIR Optical and NIR Observations
  68. GRB 160310A: Swift-XRT observations
  69. GRB 160310A: Swift ToO observations
  70. GRB 160310A: Fermi-LAT detection
  71. Swift Trigger 678197 is a noise fluctuation
  72. Trigger 677981: Swift detection of IGRJ17091-3624
  73. Swift trigger 677890 is noise
  74. GRB160303A: further GROND observations
  75. GRB 160303A, Swift-BAT refined analysis
  76. GRB 160303A: GROND Optical Detection
  77. GRB 160303A: VLT/FORS2 afterglow obervations
  78. GRB 160303A iTelescope observation
  79. GRB 160303A: Swift-XRT refined Analysis
  80. Swift possibly triggered on IGR17091-3624
  81. GRB 160303A: Swift/UVOT Detection
  82. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  83. GRB 160303A: Enhanced Swift-XRT position
  84. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  85. GRB 160303A: LCOGT-FTN optical observations
  86. GRB 160303A: ISON-NM early optical early limits
  87. GRB 160303A: Swift detection of a burst, possibly short
  88. GRB 160228A: Swift/UVOT Upper Limits
  89. GRB 160227A: Swift/UVOT Detection
  90. GRB 160228A: Mondy optcial observations
  91. GRB 160228A: RATIR Optical and NIR Observations
  92. GRB 160228A: MASTER-Amur prompt observations
  93. GRB 160228A: Swift-XRT refined Analysis
  94. GRB 160227A: MASTER prompt OT Detection and LC
  95. GRB 160227A: AROMA-N Optical Observation
  96. GRB 160228A: GROND Afterglow Candidate
  97. GRB 160228A: Swift-BAT refined analysis
  98. GRB 160228A: Enhanced Swift-XRT position
  99. GRB 160228A: Prompt enhanced Swift-XRT position
  100. GRB 160228A: Swift detection of a burst

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