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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"

19598 results found.

  1. GRB 181213A: Enhanced Swift-XRT position
  2. IPN Triangulation of GRB 181212A (long)
  3. GRB 181213A: Swift-BAT refined analysis
  4. GRB181213A: Swift/UVOT Detection
  5. GRB 181213A: Swift-XRT observations
  6. GRB 181213A: BOOTES-5/JGT optical observations
  7. SWIFT GRB181213A Global MASTER-Net bright OT discovery
  8. GRB 181213A: Swift detection of a burst
  9. GRB 181203A: GROND detection of the afterglow
  10. GRB 181203A: BOOTES-3/YA optical observations
  11. Swift Trigger 874754 is likely not an astrophysical event
  12. GRB 181203A: Swift/UVOT Upper Limits
  13. GRB 181203A: Swift-XRT refined Analysis
  14. GRB 181203A: Swift-BAT refined analysis
  15. GRB 181201A: Swift/UVOT Detection
  16. GRB 181202A: Swift/UVOT Detection
  17. GRB 181202A: RATIR Optical and NIR Observations
  18. GRB 181203A: Enhanced Swift-XRT position
  19. GRB 181203A: Swift detection of a burst
  20. GRB 181202A: Global MASTER-Net optical observations
  21. GRB 181202A: Swift-BAT refined analysis
  22. GRB 181202A: Swift-XRT refined Analysis
  23. GRB 181202A: Enhanced Swift-XRT position
  24. GRB 181202A: Swift detection of a burst with an optical counterpart
  25. GRB 181201A: Fermi-LAT detection
  26. GRB 181201A: iTelescope optical afterglow detection
  27. GRB 181201A: Swift-XRT afterglow detection
  28. GRB 181201A: Swift ToO observations
  29. GRB 181201A: Swift-XRT afterglow
  30. GRB 181201A: likely Swift/XRT afterglow
  31. GRB 181123B: ATCA 5/9 GHz rapid-response radio observation
  32. GRB 181126A: Swift-BAT refined analysis
  33. GRB 181126A: Swift/UVOT Upper Limits
  34. GRB 181126A: Swift-XRT refined Analysis
  35. GRB 181126A deep Gemini imaging
  36. GRB 181126A: Fermi GBM observation
  37. GRB 181126A: Enhanced Swift-XRT position
  38. GRB 181126A: Prompt enhanced Swift-XRT position
  39. GRB 181126A: Swift detection of a burst
  40. GRB 181123B: Insight-HXMT/HE detection
  41. GRB 181125A: Fermi GBM observation
  42. GRB 181125A: Swift-BAT refined analysis
  43. GRB 181125A: Swift detection of a burst
  44. Swift J1858.6-0814/GRB 181123A: Swift/BAT location correction to GCN 23442
  45. Swift trigger 873178: GRB 181123A is Swift J1858.6-0814
  46. GRB 181123B: Global MASTER Net optical inspection
  47. GRB 181123B: Swift-BAT lag analysis and search for extended emission
  48. GRB 181123A, Swift-BAT refined analysis
  49. GRB 181123B: Swift/UVOT Upper Limits
  50. GRB 181020A: AstroSat CZTI detection
  51. GRB 181123B: Swift-XRT refined Analysis
  52. GRB 181123B: Enhanced Swift-XRT position
  53. GRB 181123B: Prompt enhanced Swift-XRT position
  54. GRB 181123B: Swift detection of a short burst
  55. GRB 181123A: Swift detection of a burst
  56. GRB 181120A: Fermi-LAT detection
  57. Swift Trigger 872470: further Swift analysis
  58. Swift Trigger 872470 is probably not a GRB
  59. Konus-Wind observation of GRB 181110A
  60. GROND observations of GRB181110A
  61. GRB 181110A, Swift-BAT refined analysis
  62. GRB 181110A: Swift/UVOT Detection
  63. GRB 181110A: Swift-XRT refined Analysis
  64. GRB 181110A: Enhanced Swift-XRT position
  65. GRB 181110A: MITSuME Akeno optical observation
  66. GRB 181110A: Kanata 1.5m optical observation
  67. GRB 181110A: Swift detection of a burst with an optical counterpart
  68. Swift Trigger 871103 is not an astrophysical event
  69. GRB 181103A: AbAO optical upper limit
  70. GRB 181103A: Swift/UVOT Detection
  71. GRB 181103A: Nanshan-1m optical upper limit
  72. GRB 181103A: Swift-BAT refined analysis
  73. GRB 181103A: Swift-XRT refined Analysis
  74. GRB 181103A: Enhanced Swift-XRT position
  75. GRB 181103A: Swift detection of a burst
  76. GRB 181030A: Swift/UVOT Detection
  77. GRB 181030A, Swift-BAT refined analysis
  78. GRB 181030A: Swift-XRT refined Analysis
  79. GRB 181030A: MASTER Net OT detection
  80. GRB 181030A: Enhanced Swift-XRT position
  81. GRB 181030A: SAO RAS optical observations
  82. GRB 181030A: Swift detection of a burst with a possible optical counterpart
  83. GRB 181027A: Fermi GBM detection
  84. GRB 181027A: Swift-BAT refined analysis
  85. GRB 181027A: Swift detection of a burst
  86. GRB 181023A: Swift-BAT refined analysis
  87. GRB 181023A: Swift/UVOT Upper Limits
  88. GRB 181022A: Swift-XRT refined Analysis
  89. GRB 181023A: Swift-XRT refined Analysis
  90. GRB 181022A: GROND upper limits
  91. GRB 181022A: LCO Sutherland observations
  92. GRB 181023A: Enhanced Swift-XRT position
  93. GRB 181023A: KAIT Optical Upper Limit
  94. GRB 181022A: Swift/UVOT Upper Limits
  95. GRB 181023A: Swift detection of a burst
  96. GRB 181022A: Swift-BAT refined analysis
  97. GRB 181022A: Swift detection of a burst
  98. Konus-Wind observation of GRB 181020A
  99. GRB 181020A: Swift/UVOT Detection
  100. GRB 181020A: Global MASTER Net OT observations

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