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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"

19613 results found.

  1. GRB 091230: Swift-XRT observation
  2. Swift Trigger 381434 is not a GRB
  3. Trigger 381434: Swift detection of a possible burst
  4. GRB 091221 : IRSF NIR upper limit
  5. GRB 091221: Skynet/PROMPT Detections
  6. GRB 091221: Fermi GBM Observation
  7. GRB 091117: Swift-XRT late time observations
  8. GRB 091221 Swift-BAT refined analysis
  9. GRB091221: Swift/UVOT refined analysis, correction.
  10. GRB 091221: Swift/UVOT refined analysis
  11. GRB 091221: Swift-XRT refined analysis
  12. GRB 091221: Enhanced Swift-XRT position
  13. GRB 091221: UVOT Confirmation of an Optical Afterglow
  14. GRB 091221: ROTSE-III Detection of Optical Counterpart
  15. GRB 091221: Swift detection of a burst
  16. Swift trigger 379449 (possible GRB) is not a burst
  17. Trigger 379449: Swift detection of a possible burst
  18. GRB 091208A: Suzaku WAM observation of the prompt emission
  19. Konus-Wind observation of GRB 091208A
  20. GRB091208A: Swift/UVOT refined analysis
  21. GRB 091208B: optical observations
  22. GRB 091208B: GROND observations
  23. GRB 091208A: Swift-XRT observations
  24. GRB 091208B: Swift-XRT refined analysis
  25. GRB091208B: Swift/UVOT refined analysis
  26. GRB 091208B: Fermi GBM observation
  27. GRB 091208B, Swift-BAT refined analysis
  28. GRB 091208A Swift-BAT refined analysis
  29. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  30. GRB 091208A, RIMOTS optical upper limits
  31. GRB 091208B: Enhanced Swift-XRT position
  32. GRB 091208B, RIMOTS optical upper limits
  33. GRB 091208B: Swift detection of a burst with an optical afterglow
  34. GRB 091208B: BOOTES-3 optical afterglow
  35. GRB 091208: ROTSE-III Optical Limits
  36. GRB 091208: Swift detection of a burst
  37. GRB091127: Continuing Swift/UVOT Observations
  38. GRB091202: Swift-XRT refined analysis
  39. GRB 091202: Swift/UVOT Upper Limits
  40. GRB 091202 - UVOT-enhanced XRT position
  41. GRB 091127: Zadko Telescope Observations
  42. GRB 091117: Chandra Observations
  43. GRB 091127: Suzaku WAM observation of the prompt emission
  44. GRB 091130B: Swift-XRT team refined analysis
  45. GRB 091130B: Swift-BAT refined analysis
  46. GRB 091130B: Swift/UVOT Upper Limits
  47. GRB 091127: Skynet/PROMPT Observations of Fading
  48. GRB 091130B: Enhanced Swift-XRT position
  49. Swift trigger 377436 (possible GRB 091130A) is not a burst
  50. GRB 091130B: MASTER observations
  51. GRB 091130B: Swift detection of a burst
  52. GRB 091130: Swift detection of a possible burst
  53. GRB 091127: Radio observations
  54. Konus-Wind observation of GRB 091127
  55. GRB 091127: TAROT La Silla observatory optical observations
  56. GRB 091127: optical observations
  57. GRB 091127: Fermi GBM detection
  58. GRB 091127: Gemini-N redshift
  59. GRB 091127: Swift-XRT afterglow detection and analysis
  60. GRB 091127: TAROT La Silla observatory optical decay
  61. GRB 091127: Swift/UVOT observations
  62. GRB 091127: Swift-BAT refined analysis
  63. GRB 091127 : GROND observations
  64. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  65. GRB 091127: Liverpool Telescope afterglow candidate
  66. GRB 091127: Swift detection of a burst
  67. GRB 091117A: Suzaku WAM observation of the prompt emission
  68. GRB 091117A: Swift/UVOT followup observations
  69. GRB 091117: Swift-XRT observations
  70. GRB 091117 BAT refined analysis
  71. GRB 091117: Evidence for Variability of XRT Source #1
  72. GRB 091117: Swift XRT refined analysis
  73. GRB 091117: Gemini-North spectroscopy of DSS galaxy
  74. Konus-Wind observations of GRB 091117A
  75. GRB 091117: XRT source coincident with a DSS galaxy
  76. GRB 091117A Detected in ground analysis of BAT data and IPN triangulation
  77. GRB 091112: Suzaku WAM observation of the prompt emission
  78. GRB 091102A: Suzaku WAM observation of the prompt emission
  79. GRB 091109B: Suzaku WAM observation of the prompt emission
  80. GRB091111: Swift XRT refined analysis
  81. GRB 091112: Swift-BAT refined analysis
  82. GRB 091112: Fermi GBM observation
  83. GRB 091112: Swift detection of a possible burst
  84. GRB 091109B: Swift/UVOT Upper Limits
  85. GRB 091109B: Swift-XRT Team refined analysis
  86. GRB 091109B: Swift-BAT refined analysis
  87. GRB 091109B: Enhanced Swift-XRT position
  88. GRB 091109B: ROTSE-III Optical Limits
  89. GRB 091109B: Swift detection of a short burst
  90. GRB 091109: Swift-XRT refined analysis
  91. GRB 091109: Swift/UVOT observations
  92. GRB 091109: Swift-BAT refined analysis
  93. GRB 091109: Enhanced Swift-XRT position
  94. GRB 091109: Swift detection of a burst with optical afterglow
  95. GRB 091029: Observations from Stardome Observatory
  96. GRB 091104: Swift-BAT refined analysis
  97. GRB 091104: Swift XRT Refined Analysis
  98. GRB 091104: Swift/UVOT Upper Limits
  99. GRB091026 : IRSF NIR upper limit
  100. GRB091102 : MOA optical upper limit

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