Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

19596 results found.

  1. GRB 180828A: AstroSat CZTI detection
  2. GRB 180828A: Swift/UVOT Upper Limits
  3. GRB 180828A: RATIR Optical and NIR Observations
  4. GRB 180828A: Swift-BAT refined analysis
  5. GRB 180829A: Tiled Swift observations
  6. GRB 180828A: Swift-XRT refined Analysis
  7. GRB 180828A / Swift J1754.9-2548: Enhanced Swift-XRT position
  8. GRB 180828A: Fermi GBM observation
  9. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  10. GRB 180818B: TSHAO optical upper limit
  11. GRB 180823A, Swift-BAT refined analysis
  12. IPN Triangulation of GRB 180824A (short)
  13. GRB 180823A: Swift/UVOT Upper Limits
  14. GRB 180823A: RATIR Optical and NIR Observations
  15. GRB 180823A: Swift-XRT refined Analysis
  16. GRB 180823A: Enhanced Swift-XRT position
  17. GRB 180823A: Swift detection of a burst
  18. GRB 180821A: VLT observations
  19. GRB 180821A: Swift/UVOT Upper Limits
  20. GRB 180821A: Swift-BAT refined analysis
  21. GRB 180821A: iTelescope counterpart is not the afterglow
  22. GRB 180821A: Swift-XRT refined Analysis
  23. GRB 180821A: LCO Siding Springs observations
  24. GRB 180821A: Enhanced Swift-XRT position
  25. GRB 180818B: 1.5m OSN optical afterglow candidate
  26. GRB 180821A: iTelescope optical afterglow detection
  27. GRB 180821A: BOOTES-3/YA optical observations
  28. GRB 180821A: Swift detection of a burst
  29. GRB180806A: confirmation of the X-ray afterglow
  30. GRB 180818B: Swift-XRT refined Analysis
  31. GRB 180818B: Swift-BAT refined analysis
  32. GRB 180818A: Swift-BAT refined analysis
  33. GRB 180818B: Fermi GBM observations
  34. GRB 180818B: Swift/UVOT Upper Limits
  35. GRB 180818B: Enhanced Swift-XRT position
  36. GRB 180818A: Swift/UVOT Upper Limits
  37. GRB 180818B: Swift detection of a burst
  38. GRB 180818A: Swift-XRT refined Analysis
  39. GRB 180818A: Enhanced Swift-XRT position
  40. GRB 180818A: Swift detection of a burst
  41. Swift Trigger 853790 is probably not an astrophysical source
  42. GRB 180809B: AstroSat CZTI detection
  43. GRB 180809A: further Swift/XRT observations
  44. GRB 180812A: Swift/UVOT Detection
  45. GRB 180812A: Swift-BAT refined analysis
  46. GRB 180812A: Fermi GBM detection
  47. GRB 180812A: Swift-XRT refined Analysis
  48. GRB 180812A: Enhanced Swift-XRT position
  49. GRB 180812A: BOOTES-5/JGT optical afterglow detection
  50. GRB 180812A: Swift detection of a burst
  51. Konus-Wind observation of GRB 180809B
  52. GRB180809B TUG T60 observations
  53. GRB 180809B: Swift-XRT refined Analysis
  54. GRB 180809B, Swift-BAT refined analysis
  55. Swift Trigger 852625: Swift/BAT/XRT/UVOT observations
  56. GRB 180809B: Swift/UVOT Detection
  57. GRB 180809A: Fermi GBM observation
  58. GRB 180809B: CALET Gamma-Ray Burst Monitor detection
  59. Swift Trigger 852625: a possible GRB
  60. GRB180809B: MASTER Triple Independent Automatic OT Detection
  61. GRB 180809B: LCO Sutherland observations
  62. GRB 180809B: GROND Detection of the NIR Afterglow
  63. GRB180809B: MASTER OT observation
  64. GRB 180809A: Swift-XRT afterglow detection
  65. GRB 180809B: Swift detection of a burst with an optical afterglow
  66. GRB 180809A: Tiled Swift observations
  67. GRB 180728A: AstroSat CZTI detection
  68. GRB180806A: correction to Circular 23097
  69. GRB 180806A: Swift-XRT afterglow detection
  70. GRB 180806A: Fermi GBM detection
  71. GRB 180806A: Swift ToO observations
  72. GRB 180805B: 1.5m OSN I-band observation
  73. GRB 180805B: GOTO optical limits
  74. GRB 180805B: MASTER optical late inspection short GRB with extended emission
  75. GRB 180805A: Swift-XRT refined Analysis
  76. GRB 180805B: Swift-XRT refined Analysis
  77. GRB 180805B: Swift-BAT refined analysis (short GRB with extended emission)
  78. GRB 180805A: Swift-BAT refined analysis
  79. GRB 180805B: Swift/UVOT Upper Limits
  80. GRB 180805B: Fermi GBM detection
  81. GRB 180805B: Enhanced Swift-XRT position
  82. GRB 180805B: Swift detection of a burst
  83. GRB 180805A: Enhanced Swift-XRT position
  84. GRB 180805A: Swift detection of a burst
  85. GRB 180727A: Swift/BAT spectral lag result
  86. GRB 180728A: Swift/UVOT Detection
  87. GRB 180727A: Swift/UVOT Upper Limits
  88. Konus-Wind observation of the bright nearby GRB 180728A
  89. GRB 180715A: CALET CAL gamma-ray analysis
  90. IPN Triangulation of GRB 180728B (short)
  91. GRB 180728A: Swift-BAT refined analysis
  92. GRB 180728A: Fermi GBM observation
  93. GRB 180728A: Swift-XRT refined Analysis
  94. GRB 180728A: Enhanced Swift-XRT position
  95. GRB 180728A: MASTER OT J165415.75-540239.27 is the Optical Counterpart of GRB
  96. GRB 180728A: Swift-XRT observations
  97. GRB 180728A: MASTER OT (= new object) detection
  98. GRB 180727A: Swift-BAT refined analysis
  99. GRB 180728A: Swift detection of a bright burst
  100. GRB 180727A: Swift-XRT refined Analysis

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