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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 160228A: Enhanced Swift-XRT position
  2. GRB 160228A: Prompt enhanced Swift-XRT position
  3. GRB 160228A: Swift detection of a burst
  4. GRB 160227A, Swift-BAT refined analysis
  5. GRB 160227A: Swift-XRT refined Analysis
  6. GRB 160227A: Enhanced Swift-XRT position
  7. GRB 160225A: TSHAO optical afterglow detection
  8. GRB 160227A: MASTER OT Detection
  9. GRB 160227A: Swift detection of a burst with an optical counterpart
  10. IPN Triangulation of GRB 160225B
  11. GRB 160225A: Swift-BAT refined analysis
  12. GRB 160225A: MASTER-Amur observations
  13. GRB 160225A: Swift/UVOT Upper Limits
  14. GRB 160225A: Swift-XRT refined Analysis
  15. GRB 160225A: TSHAO optical upper limit
  16. GRB 160225A: Enhanced Swift-XRT position
  17. GRB 160225A: MASTER-Amur early observations
  18. GRB 160225A: Swift detection of a burst
  19. GRB 160223A: Swift-XRT afterglow detection
  20. GRB 160221A: Swift-XRT afterglow detection
  21. GRB 160223A: AbAO optical observations
  22. Swift trigger 675784 is probably not an astrophysical source
  23. GRB 160223A: Swift-BAT refined analysis
  24. GRB 160223A: Fermi GBM observation
  25. GRB 160223B: Swift-XRT observations
  26. GRB 160223B: Swift ToO observations
  27. GRB 160223A: GROND optical/NIR afterglow
  28. GRB 160223A: Swift detection of a burst
  29. GRB 160221A: GROND upper limits
  30. Correction to the title of Swift GCN 19051
  31. GRB 160220B: Further GROND Observations
  32. Further Swift/UVOT observations of GRB 160220B
  33. GRB 160221A: Swift-XRT observations
  34. GRB 160221A: Swift ToO observations
  35. Konus-Wind observation of GRB 160220B
  36. Swift trigger 674752 is likely due to a noise fluctuation
  37. GRB 160220B: Swift-BAT refined analysis
  38. GRB 160220B: GROND Observations
  39. GRB 160220A: nIR observations at AAT
  40. GRB 160220A: Swift-XRT refined Analysis
  41. GRB 160220A: Swift-BAT refined analysis
  42. GRB160220B: Swift/UVOT observations
  43. GRB 160220B: Swift-XRT refined Analysis
  44. IPN Triangulation of GRB 160219A (short/hard)
  45. GRB160220B: Enhanced Swift-XRT position
  46. GRB160220A: Swift/UVOT observations
  47. Swift Trigger 674752 is likely a noise fluctuation in the direction of IGR17488-3253
  48. GRB 160220A: TAROT Calern and TAROT La Silla observatory optical observations
  49. GRB 160220B: Swift detection of a burst
  50. GRB 160220A: MASTER-Amur observations
  51. GRB 160220A: GROND Optical/NIR Upper Limits
  52. GRB 160220A: Fermi GBM observation
  53. GRB 160220A: Enhanced Swift-XRT position
  54. GRB 160220A: Swift-XRT observations
  55. GRB 160220A: Swift detection of a burst
  56. GRB 160216A: Swift-BAT refined analysis
  57. Konus-Wind observation of GRB 160216A (and GRB 160216B)
  58. GRB 160216A: Swift-XRT refined Analysis
  59. GRB 160216A: Swift/UVOT Upper Limits
  60. GRB 160216A: Enhanced Swift-XRT position
  61. GRB 160216A: Swift detection of a burst
  62. GRB 160131A: second epoch observations with the GMRT
  63. Low frequency GMRT observations of GRB 160131A
  64. GRB 160206A: Kiso/KWFC optical observations
  65. GRB 160203A: RATIR Upper Limits
  66. GRB 160131A: TSHAO optical observations
  67. Swift Trigger 672897 is probably not an astrophysical event
  68. GRB 151215A: TAROT Calern observatory very early optical detection
  69. GRB 160206A: Swift/UVOT observations
  70. GRB 160203A: Zadko observatory - Gingin optical detection
  71. GRB 160203A: Swift-BAT refined analysis
  72. GRB 160206A: GROND Observations
  73. GRB 160206A: Swift-XRT observations
  74. GRB 160206A: Tiled Swift observations
  75. GRB 160131A: TSHAO optical observations
  76. GRB 160131A: Mondy optcial observations
  77. GRB 160203A: TSHAO optical observations
  78. GRB 160203A: RATIR Optical Observations
  79. GRB 160131A: RATIR Optical Observations
  80. GRB 160203A: Skynet PROMPT-CTIO observations of the optical afterglow
  81. GRB 160203A: Swift-XRT refined Analysis
  82. GRB 160203A: Swift/UVOT Detection
  83. GRB 160203A: Enhanced Swift-XRT position
  84. The bright GRB160203A: X-shooter spectroscopy and redshift
  85. GRB 160203A: GROND Afterglow Candidate
  86. GRB 160203A: Swift detection of a burst
  87. GRB 160131A: VLA detection
  88. Konus-Wind observation of GRB 160131A
  89. GRB 160131A: AbAO optical observations
  90. GRB 160131A: Mondy optical observations
  91. GRB 160131A Swift/UVOT Detection
  92. GRB 160131A: GROND Detection of the Optical/NIR Afterglow
  93. GRB 160131A: Swift-XRT refined Analysis
  94. GRB 160131A: Khureltogot optical observations
  95. GRB 160131A: Swift-BAT refined analysis
  96. GRB 160131A: Enhanced Swift-XRT position
  97. GRB 160131A: LCOGT-FTN optical afterglow observations
  98. GRB160131.35 MASTER-Net OT detection
  99. GRB 160131A: Swift detection of a burst with an optical counterpart
  100. GRB 160127A: Khureltogot optical observations

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