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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"

19663 results found.

  1. GRB 131229A: GROND observations
  2. GRB 131229A: Swift-BAT refined analysis
  3. GRB 131229A: Swift-XRT refined Analysis
  4. GRB 131229A: Swift/UVOT Upper Limits
  5. GRB 131227A: GROND Upper Limits
  6. GRB 131229A: Enhanced Swift-XRT position
  7. GRB 131229A: KAIT Optical Upper Limit
  8. GRB 131229A: Swift detection of a burst
  9. GRB 131227A: P60 Limits
  10. GRB 131227A: Gemini-North Redshift
  11. GRB 131227A: Swift-XRT refined Analysis
  12. GRB 131227A: Swift/UVOT Upper Limits
  13. GRB 131227A: Swift-BAT refined analysis
  14. Konus-Wind observation of GRB 131226A
  15. GRB 131227A: Enhanced Swift-XRT position
  16. GRB 131227A: Swift detection of a burst
  17. GRB 131224A: Swift/UVOT Upper Limits
  18. GRB 131226A, Swift-BAT refined analysis
  19. GRB 131226A: Swift detection of a burst
  20. GRB 131216A: Suzaku WAM observation of the prompt emission
  21. GRB 131224A: Swift-XRT observation
  22. GRB 131218A: Swift XRT and UVOT observations
  23. IPN Triangulation of GRB 131216A
  24. Trigger 581129: Swift-BAT triggered on noise
  25. GRB 131209A: Swift XRT and UVOT observations
  26. GRB 131209A Tiled Swift observations
  27. IPN Triangulation of GRB 131209A
  28. GRB131202A : GROND observations
  29. GRB 131205A: Swift-BAT refined analysis
  30. GRB 131205A: Swift-XRT refined Analysis
  31. Swift Trigger 580319 is not a GRB
  32. GRB 131205A: Swift/UVOT Upper Limits
  33. GRB 131205A: Enhanced Swift-XRT position
  34. GRB 131205A: Zadko observatory - Gingin optical observations
  35. GRB 131205A: Swift detection of a burst
  36. GRB 131127B: rejection of optical counterpart candidates
  37. GRB 131127A: optically dark burst
  38. GRB 131202A, Swift-BAT refined analysis
  39. GRB 131202A: Swift/UVOT Upper Limits
  40. GRB 131202A: Swift-XRT refined Analysis
  41. GRB 131202A: RATIR Optical and NIR Observations
  42. GRB 131202A: Fermi GBM Detection
  43. GRB 131202A: Enhanced Swift-XRT position
  44. GRB 060614: theoretical derivation of the redshift and need for deeper search of the host galaxy
  45. GRB 131202A: Swift detection of a burst
  46. GRB 131122A: Swift-XRT Further Observation
  47. GRB 131128A: Bassano Bresciano Observatory optical upper limit
  48. GRB 131128A; Fermi GBM observation
  49. GRB 131128A: GROND observations of the afterglow
  50. GRB 131128A: Swift/UVOT Detection
  51. GRB 131128A: AROMA-N Optical Observation
  52. GRB 131128A: Swift-XRT refined Analysis
  53. GRB 131128A: Kanata/HOWPol optical observation
  54. GRB 131128A: T100 observations
  55. GRB 131128A: Swift-BAT refined analysis
  56. GRB 131128A: Enhanced Swift-XRT position
  57. GRB 131128A: Nanshan afterglow confirmation
  58. GRB 131128A: MASTER-Net optical observations
  59. GRB 131128A: Nanshan afterglow candidate
  60. GRB 131128A: Swift detection of a burst
  61. GRB 131127A: Bassano Bresciano Observatory optical upper limit
  62. GRB 131127A: Swift/UVOT Upper Limits
  63. GRB 131127A: AROMA-N Optical Observation
  64. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  65. Fermi407254341: iPTF optical afterglow candidates
  66. GRB 131127A: Swift-XRT refined Analysis
  67. GRB 131127A. 1.5m OSN optical limit
  68. GRB 131127A, Swift-BAT refined analysis
  69. GRB 131127A: Enhanced Swift-XRT position
  70. GRB 131127A: Mondy optical upper limit
  71. GRB 131127A: MASTER-NET optical observations
  72. GRB 131127A: Swift detection of a burst
  73. GRB 131122A: Swift/UVOT Upper Limits
  74. GRB 131122A: Upper limit from NOT imaging
  75. GRB 131122A: Swift-XRT observations
  76. GRB 131120A, Swift-BAT refined analysis
  77. IPN Triangulation of GRB 131118A
  78. GRB 131120A: Swift detection of a burst
  79. GRB 131118A: Fermi GBM detection
  80. GRB 131030A, Optical Observations
  81. GRB 131117A, Swift-BAT refined analysis
  82. GRB 131117A: TAROT La Silla observatory optical observations
  83. GRB 131117A: Swift/UVOT Detection
  84. GRB 131117A: Swift-XRT refined Analysis
  85. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  86. GRB 131117A: Enhanced Swift-XRT position
  87. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  88. GRB 131117A: Swift detection of a burst
  89. GRB 131110A: Swift-XRT and UVOT upper limits
  90. GRB 131110A BAT refined analysis
  91. GRB 131031A: Mondy optical observations
  92. GRB 131108A: optical observations
  93. GRB 131110A found in ground analysis of BAT slew event data
  94. GRB 131108A: Fermi GBM observation
  95. GRB 131108A: Swift/UVOT Detection
  96. GRB 131108A: Swift-XRT observations
  97. GRB 131108A: NOT optical observations
  98. GRB 131108A: Swift detection of a possible X-ray afterglow
  99. GRB 131108A Tiled Swift observations
  100. GRB 131108A: Fermi-LAT onboard detection of a burst

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