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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"

19593 results found.

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

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