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"

19662 results found.

  1. GRB 201015A: Swift-XRT refined Analysis
  2. MAGIC observations of GRB 201015A: hint of very high energy gamma-ray signal
  3. GRB 201015A: Swift-BAT refined analysis (a soft short pulse with a tail emission)
  4. GRB 201014A: Nanshan/NEXT optical observations
  5. GRB 201014A: Lowell Discovery Telescope afterglow imaging
  6. Konus-Wind observation of GRB 201013A
  7. GRB 201008A: Swift-XRT afterglow detection
  8. GRB 201015A: Enhanced Swift-XRT position
  9. GRB 201015A: BOOTES-1 early optical afterglow detection
  10. GRB 201014A: Swift/UVOT Upper Limits
  11. GRB 201015A: GOTO confirmation of afterglow detection
  12. GRB 201014A: Swift-XRT refined Analysis
  13. GRB 201015A: Swift-XRT observations
  14. Swift GRB 201015A: Global MASTER-Net observations report
  15. Swift GRB201015.95: Global MASTER-Net OT detection
  16. GRB 201015A: Swift detection of a burst
  17. GRB 201014A: BOOTES-1 and -2 early optical upper limits
  18. GRB 201014A: Swift-BAT refined analysis
  19. GRB 201014A (Swift trigger =1000255): CrAO/ZTSH optical afterglow discovery
  20. Swift-BAT trigger 1000255: XRT afterglow detection of GRB 201014A
  21. GRB 201013A: Insight-HXMT/HE detection
  22. Swift Trigger 1000255 is probably not a GRB
  23. GRB 201013A: TSHAO and AbAO optical observations, afterglow confirmation
  24. GRB 201013A: AstroSat CZTI detection
  25. GRB 201013A: CALET Gamma-Ray Burst Monitor detection
  26. GRB 201013A: Swift-BAT refined analysis
  27. GRB 201013A: Swift/UVOT Upper Limits
  28. Swift GRB 201013A: Global MASTER-Net observations report
  29. GRB 201013A: Swift-XRT refined Analysis
  30. SGR 1830-0645: Swift/UVOT Upper Limits
  31. GRB 201013A: Enhanced Swift-XRT position
  32. GRB 201013A: Swift detection of a burst
  33. SGR 1830-0645: pre-discovery detection in Swift/BAT
  34. SGR 1830-0645 / GRB 201010A: 1.5m OSN optical upper limit
  35. SGR 1830-0645: Swift-BAT refined analysis
  36. GRB 201006A: Chandra upper limit on the X-ray afterglow
  37. SGR 1830-0645 / GRB 201010A: Kitab optical non-detection
  38. GRB 201010A: Enhanced Swift-XRT position
  39. Swift GRB201010.62: Global MASTER-Net observations report
  40. Swift detection of a new SGR 1830-0645 or a short GRB 201010A
  41. GRB 201008A: Swift-XRT observations
  42. GRB 201008A: Swift ToO observations
  43. GRB 201008A: Swift/BAT-GUANO detection and possible arcminute localization
  44. Swift-XRT observations of IceCube 201007A
  45. GRB 201006A: GROWTH-India Telescope optical upper limit
  46. GRB 201006A: Lowell Discovery Telescope upper limits
  47. GRB 201006A: MITSuME Akeno optical upper limits
  48. GRB 201006A: Swift-XRT refined Analysis
  49. GRB 201006A: Swift-BAT refined analysis
  50. GRB 201006A: Swift/UVOT Upper Limits
  51. GRB 201006A: Fermi GBM detection
  52. GRB 201006A is likely a short burst
  53. GRB 201006A: Enhanced Swift-XRT position
  54. INTEGRAL sub-threshold detection of GRB 201006A
  55. GRB 201006A: Swift detection of a burst
  56. Swift GRB201006.05: Global MASTER-Net observations report
  57. GRB 201001A: Swift/UVOT Upper Limits
  58. GRB 201001A: TSHAO optical upper limit
  59. GRB 201001A: MITSuME Akeno optical upper limits
  60. GRB 201001A: Swift-BAT refined analysis
  61. GRB 201001A: Swift-XRT refined Analysis
  62. GRB 201001A: Fermi GBM observation
  63. Swift-XRT observations of IceCube 200929A
  64. GRB 201001A: Enhanced Swift-XRT position
  65. GRB 201001A: Swift detection of a burst
  66. Swift-XRT observations of IceCube 200926A
  67. GRB 200925B: Swift-XRT refined analysis update
  68. GRB 200925B: Swift-XRT refined Analysis
  69. GRB 200925B: Swift/UVOT Detection
  70. GRB 200925B: Swift-BAT refined analysis
  71. GRB 200925B: Enhanced Swift-XRT position
  72. Swift GRB 200925B: Global MASTER-Net OT detection
  73. GRB 200925B: OSN Afterglow Candidate Discovery
  74. GRB 200925B: Prompt enhanced Swift-XRT position
  75. GRB 200925B: Swift detection of a burst
  76. Swift GRB200925.91: Global MASTER-Net observations report
  77. GRB 200922A: chance superposition between optical afterglow and archival star
  78. GRB 200922A: Insight-HXMT/HE detection
  79. GRB 200922A: Swift-BAT refined analysis
  80. Improved enhanced Swift-XRT position of GRB 200922A
  81. GRB 200922A: Swift/UVOT Detection
  82. Swift GRB 200922A: Global MASTER-Net observations report
  83. GRB 200922A: Swift-XRT refined Analysis
  84. GRB 200917A: Swift/UVOT Upper Limits
  85. GRB 200922A: Enhanced Swift-XRT position
  86. GRB 200922A: Swift detection of a burst with possible optical counterpart
  87. GRB 200914A: Swift-XRT further observations
  88. GRB 200919A: Swift-BAT refined analysis
  89. Swift GRB200919.08: Global MASTER-Net observations report
  90. GRB 200919A: Swift detection of a burst
  91. GRB 200917A: GROWTH-India Telescope optical upper limit.
  92. Swift-XRT observations of IceCube 200916A
  93. GRB 200917A: Swift-BAT refined analysis
  94. Fermi-GBM Sub-Threshold Detection of GRB 200917A
  95. GRB 200917A: Swift-XRT refined Analysis
  96. Swift GRB 200917A: Global MASTER-Net observations report
  97. IPN triangulation of GRB 200916B (short)
  98. GRB 200917A: Enhanced Swift-XRT position
  99. GRB 200917A: Swift detection of a burst
  100. Swift-XRT observations of IceCube 200911A

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