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"

19666 results found.

  1. GRB 140512A: Enhanced Swift-XRT position
  2. Swift Observations of GRB 140508A
  3. GRB 140428A: GROND afterglow confirmation
  4. GRB 140512A: Swift detection of a burst with an optical counterpart
  5. GRB 140512A: MASTER optical observations
  6. GRB 140423A: Mondy optical observations
  7. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  8. GRB 140508A: Swift/UVOT Detection
  9. GRB 140509A: Swift/UVOT Detection and photo-z
  10. GRB 140509A: Swift-BAT refined analysis
  11. VHE gamma-ray observations by MAGIC of SWIFT Trigger 596958
  12. GRB 140509A: Swift-XRT refined Analysis
  13. GRB 140509A: Enhanced Swift-XRT position
  14. GRB 140508A: Swift-XRT observations
  15. GRB 140509A: Swift detection of a burst with an optical counterpart
  16. GRB 140508A: iPTF optical transient candidate
  17. IPN triangulation of GRB 140508A
  18. Konus-Wind observation of GRB 140506A
  19. GRB 140502A: ISON-NM early optical limit
  20. GRB 140506A: Fermi GBM Detection
  21. GRB 140506A: Swift/UVOT Detection
  22. GRB 140506A: Swift-BAT refined analysis
  23. GRB 140506A: Swift-XRT refined Analysis
  24. GRB 140506A: Enhanced Swift-XRT position
  25. GRB 140506A: Swift detection of a burst with an optical counterpart
  26. Konus-Wind observation of GRB 140423A
  27. GRB 140430A: iTelescope.Net T16 Optical Observation
  28. GRB 140502A: Swift/UVOT Upper Limits
  29. GRB 140502A: Swift-BAT refined analysis
  30. GRB 140502A: Swift-XRT refined Analysis
  31. GRB 140502A: Enhanced Swift-XRT position
  32. Swift Trigger 597860 is probably not a GRB
  33. GRB 140502A: Fermi GBM observation
  34. GRB 140502A: Swift detection of a burst
  35. GRB 140430A: Swift-BAT refined analysis
  36. GRB 140430A: Swift/UVOT Observations
  37. GRB 140430A: Swift-XRT refined Analysis
  38. GRB 140430A: Enhanced Swift-XRT position
  39. GRB 140430A : Liverpool Telescope optical afterglow observations
  40. GRB 140428A: GROND observations
  41. GRB140430A: Swift detection of a burst with an optical counterpart
  42. GRB 140428A: Swift/UVOT Upper Limits
  43. GRB 140428A: Swift-BAT refined analysis
  44. Trigger 597570: Swift detection of SGR 1806-20
  45. GRB 140428A: Swift-XRT detection of a source
  46. GRB 140428A: Swift Detection of a Possible Burst
  47. GRB 140423A Third epoch pODI photometry
  48. GRB 140423A: Continued RATIR Optical and NIR Observations
  49. GRB 140413A: GROND Afterglow Confirmation
  50. DG CVn: optical observations
  51. GRB 140419A: Continued Mondy optical observations
  52. GRB 140423A pODI/WIYN afterglow photometry
  53. GRB 140423A, Optical Observations
  54. GRB 140423A: Swift-XRT refined Analysis
  55. GRB 140423A: Swift-BAT refined analysis
  56. Swift Trigger 596958 is positionally consistent with V* DG CVn/2XMM J133146.4+291635
  57. Swift Trigger 596958 is probably the flare star: DG CVn
  58. GRB 140423A: Further Observations with Swift/UVOT
  59. GRB 140423A: KAIT Optical Detection
  60. GRB 140423A: Enhanced Swift-XRT position
  61. GRB 140423A: P60 Observations
  62. GRB 140423A: Fermi GBM observation
  63. GRB 140419A, LOAO R-band observations
  64. GRB 140423A: Swift/UVOT detection of a possible counterpart
  65. GRB 140423A: Swift-XRT observations
  66. GRB 140423A: ROTSE-III Detection of Optical Counterpart
  67. GRB 140423A optical observations with pODI/WIYN at KPNO
  68. GRB 140423A: optical afterglow candidate
  69. GRB 140423A: Swift detection of a burst
  70. GRB 140419A: Mondy optical observations
  71. GRB 140419A: KAIT Refined Analysis
  72. Swift Trigger 596641 is not a GRB
  73. Konus-Wind observation of GRB 140419A
  74. GRB 140419A, Optical Observations
  75. GRB 140419A: Swift UVOT refined analysis
  76. GRB 140419A: P60 Observations
  77. GRB 140419A: Swift-XRT refined Analysis
  78. GRB 140419A: Swift-BAT refined analysis
  79. GRB 140419A: Enhanced Swift-XRT position
  80. GRB140419A: UVOT detects fading afterglow in white but not in u filter
  81. GRB 140419A: ROTSE-III Detection of Optical Counterpart
  82. GRB 140419A (Swift trigger 596426) : KAIT optical candidate
  83. GRB 140419A: Swift detection of a burst with optical afterglow
  84. GRB 140414A: Swift/UVOT Upper Limit
  85. GRB 140414A: Swift-XRT observations
  86. GRB 140414A: Swift-BAT refined analysis
  87. GRB 140414A: Short burst found in ground analysis of BAT slew data
  88. GRB 140413A: Swift/UVOT Observations of the Optical Afterglow
  89. GRB 140412A: Swift/UVOT Upper Limits
  90. Konus-Wind observation of GRB 140413A
  91. GRB 140413A: Swift-XRT refined Analysis
  92. GRB 140413A: Swift-BAT refined analysis
  93. GRB 140412A: Swift-XRT refined Analysis
  94. GRB 140412A: Swift-BAT refined analysis
  95. GRB 140413A: TAROT La Silla observatory optical observations
  96. GRB 140413A: Swift-XRT observations
  97. GRB 140412A: Enhanced Swift-XRT position
  98. GRB 140413A: GROND afterglow candidate
  99. Swift Trigger 595616: a possible GRB
  100. GRB 140412A: 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