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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"

20008 results found.

  1. GRB 100111A: Fermi GBM observation
  2. GRB 100111A: Swift detection of a burst with an optical afterglow
  3. Swift/BAT Detects an Outburst from XTE J1901+014
  4. Swift Trigger #382159 is due to XTE J1752-223
  5. GRB 100103A: Swift-XRT team refined analysis
  6. GRB 100103A - UVOT-enhanced XRT position
  7. GRB 100103A: Swift/UVOT Upper Limits
  8. GRB 100103A: Correction to Swift position error
  9. GRB 100103A: Swift/XRT position
  10. Swift Trigger 381591: Retraction of Reported UVOT Source
  11. Swift Trigger 381591 is probably not a burst
  12. Swift Trigger 381591: Uncatalogued UVOT Source
  13. GRB 091230: Swift/UVOT Observations
  14. Trigger 381591: Swift detection of a possible burst
  15. GRB 091230: Swift-XRT observation
  16. Swift Trigger 381434 is not a GRB
  17. Trigger 381434: Swift detection of a possible burst
  18. GRB 091221 : IRSF NIR upper limit
  19. GRB 091221: Skynet/PROMPT Detections
  20. GRB 091221: Fermi GBM Observation
  21. GRB 091117: Swift-XRT late time observations
  22. GRB 091221 Swift-BAT refined analysis
  23. GRB091221: Swift/UVOT refined analysis, correction.
  24. GRB 091221: Swift/UVOT refined analysis
  25. GRB 091221: Swift-XRT refined analysis
  26. GRB 091221: Enhanced Swift-XRT position
  27. GRB 091221: UVOT Confirmation of an Optical Afterglow
  28. GRB 091221: ROTSE-III Detection of Optical Counterpart
  29. GRB 091221: Swift detection of a burst
  30. Swift trigger 379449 (possible GRB) is not a burst
  31. Trigger 379449: Swift detection of a possible burst
  32. GRB 091208A: Suzaku WAM observation of the prompt emission
  33. Konus-Wind observation of GRB 091208A
  34. GRB091208A: Swift/UVOT refined analysis
  35. GRB 091208B: optical observations
  36. GRB 091208B: GROND observations
  37. GRB 091208A: Swift-XRT observations
  38. GRB 091208B: Swift-XRT refined analysis
  39. GRB091208B: Swift/UVOT refined analysis
  40. GRB 091208B: Fermi GBM observation
  41. GRB 091208B, Swift-BAT refined analysis
  42. GRB 091208A Swift-BAT refined analysis
  43. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  44. GRB 091208A, RIMOTS optical upper limits
  45. GRB 091208B: Enhanced Swift-XRT position
  46. GRB 091208B, RIMOTS optical upper limits
  47. GRB 091208B: Swift detection of a burst with an optical afterglow
  48. GRB 091208B: BOOTES-3 optical afterglow
  49. GRB 091208: ROTSE-III Optical Limits
  50. GRB 091208: Swift detection of a burst
  51. GRB091127: Continuing Swift/UVOT Observations
  52. GRB091202: Swift-XRT refined analysis
  53. GRB 091202: Swift/UVOT Upper Limits
  54. GRB 091202 - UVOT-enhanced XRT position
  55. GRB 091127: Zadko Telescope Observations
  56. GRB 091117: Chandra Observations
  57. GRB 091127: Suzaku WAM observation of the prompt emission
  58. GRB 091130B: Swift-XRT team refined analysis
  59. GRB 091130B: Swift-BAT refined analysis
  60. GRB 091130B: Swift/UVOT Upper Limits
  61. GRB 091127: Skynet/PROMPT Observations of Fading
  62. GRB 091130B: Enhanced Swift-XRT position
  63. Swift trigger 377436 (possible GRB 091130A) is not a burst
  64. GRB 091130B: MASTER observations
  65. GRB 091130B: Swift detection of a burst
  66. GRB 091130: Swift detection of a possible burst
  67. GRB 091127: Radio observations
  68. Konus-Wind observation of GRB 091127
  69. GRB 091127: TAROT La Silla observatory optical observations
  70. GRB 091127: optical observations
  71. GRB 091127: Fermi GBM detection
  72. GRB 091127: Gemini-N redshift
  73. GRB 091127: Swift-XRT afterglow detection and analysis
  74. GRB 091127: TAROT La Silla observatory optical decay
  75. GRB 091127: Swift/UVOT observations
  76. GRB 091127: Swift-BAT refined analysis
  77. GRB 091127 : GROND observations
  78. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  79. GRB 091127: Liverpool Telescope afterglow candidate
  80. GRB 091127: Swift detection of a burst
  81. GRB 091117A: Suzaku WAM observation of the prompt emission
  82. GRB 091117A: Swift/UVOT followup observations
  83. GRB 091117: Swift-XRT observations
  84. GRB 091117 BAT refined analysis
  85. GRB 091117: Evidence for Variability of XRT Source #1
  86. GRB 091117: Swift XRT refined analysis
  87. GRB 091117: Gemini-North spectroscopy of DSS galaxy
  88. Konus-Wind observations of GRB 091117A
  89. GRB 091117: XRT source coincident with a DSS galaxy
  90. GRB 091117A Detected in ground analysis of BAT data and IPN triangulation
  91. GRB 091112: Suzaku WAM observation of the prompt emission
  92. GRB 091102A: Suzaku WAM observation of the prompt emission
  93. GRB 091109B: Suzaku WAM observation of the prompt emission
  94. GRB091111: Swift XRT refined analysis
  95. GRB 091112: Swift-BAT refined analysis
  96. GRB 091112: Fermi GBM observation
  97. GRB 091112: Swift detection of a possible burst
  98. GRB 091109B: Swift/UVOT Upper Limits
  99. GRB 091109B: Swift-XRT Team refined analysis
  100. GRB 091109B: Swift-BAT refined analysis

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