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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"

21800 results found.

  1. GRB 100103A: GROND Upper Limits
  2. GRB 100103A - UVOT-enhanced XRT position
  3. Konus-Wind observation of GRB 100103A
  4. GRB 100103A: Swift/XRT position
  5. Swift Trigger 381591 is probably not a burst
  6. GRB 091231: GROND NIR observations
  7. Swift Trigger 381591: Uncatalogued UVOT Source
  8. GRB 091230: Swift/UVOT Observations
  9. Trigger 381591: Swift detection of a possible burst
  10. GRB 091230: Swift-XRT observation
  11. GRB 091230: GROND optical/NIR afterglow candidate
  12. Swift Trigger 381434 is not a GRB
  13. Trigger 381434: Swift detection of a possible burst
  14. GRB 091221: Skynet/PROMPT Detections
  15. GRB 091117: Swift-XRT late time observations
  16. GRB 091221: Swift/UVOT refined analysis
  17. GRB 091221: Enhanced Swift-XRT position
  18. GRB 091221: UVOT Confirmation of an Optical Afterglow
  19. GRB 091221: Swift detection of a burst
  20. Swift trigger 379449 (possible GRB) is not a burst
  21. GRB 091215: Faulkes Telescope North observations
  22. Trigger 379449: Swift detection of a possible burst
  23. GRB 091208A: Suzaku WAM observation of the prompt emission
  24. GRB 091208A: GAO 150cm telescope Optical Observation
  25. GRB 091208B: GAO 150cm telescope Optical Observation
  26. GRB091208A: Swift/UVOT refined analysis
  27. GRB 091208B: optical observations
  28. GRB 091208B: GROND observations
  29. GRB 091208A: Swift-XRT observations
  30. GRB091208B: NOT optical observations
  31. GRB 091208A, RIMOTS optical upper limits
  32. GRB 091208B: MITSuME Akeno Optical Observation
  33. GRB 091208B: Enhanced Swift-XRT position
  34. GRB 091208B: MITSuME Okayama Optical Observation
  35. GRB 091208B, RIMOTS optical upper limits
  36. GRB 091208B: Swift detection of a burst with an optical afterglow
  37. GRB 091208B: BOOTES-3 optical afterglow
  38. GRB 091208: ROTSE-III Optical Limits
  39. GRB 091123: Suzaku WAM observation of the prompt emission
  40. GRB 091127: GAO 150cm telescope Optical Observation
  41. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  42. GRB 091109A: GROND confirmation of redshift z = 3.5
  43. GRB 091127, SMARTS optical/IR afterglow observations
  44. GRB 091202: Swift/UVOT Upper Limits
  45. GRB 091202 - UVOT-enhanced XRT position
  46. GRB 091127: Zadko Telescope Observations
  47. GRB 091126A: Suzaku WAM observation of the prompt emission
  48. GRB 091202: TAROT Calern observatory optical observations
  49. GRB 091117: Chandra Observations
  50. Konus-Wind observation of very long GRB 091123
  51. GRB 091123: Fermi GBM detection of a very long burst
  52. GRB 091127: Suzaku WAM observation of the prompt emission
  53. GRB 091130B: Swift/UVOT Upper Limits
  54. GRB 091130B: Enhanced Swift-XRT position
  55. Swift trigger 377436 (possible GRB 091130A) is not a burst
  56. GRB 091130B: Swift detection of a burst
  57. GRB 091127: Radio observations
  58. Konus-Wind observation of GRB 091127
  59. GRB 091127: TAROT La Silla observatory optical observations
  60. GRB 091127: LABOCA/APEX submm observations
  61. GRB 091127: Further NOT optical observations
  62. GRB 091127: Swift-XRT afterglow detection and analysis
  63. GRB 091127: TAROT La Silla observatory optical decay
  64. GRB 091127: Swift/UVOT observations
  65. GRB 091127: NOT observations
  66. GRB 091127 : GROND observations
  67. GRB 091127: REM NIR afterglow detection
  68. Konus-Wind observation of GRB 091120
  69. GRB 091120: Fermi GBM observation
  70. GRB 091117A: Suzaku WAM observation of the prompt emission
  71. GRB 091117: TNG optical observations
  72. GRB 091117A: Swift/UVOT followup observations
  73. GRB 091117: Evidence for Variability of XRT Source #1
  74. GRB091117: Gemini South Observations
  75. GRB 091117: Swift XRT refined analysis
  76. Konus-Wind observations of GRB 091117A
  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. Konus-Wind and Konus-RF observations of GRB 091031
  82. GRB 091031: Fermi LAT detection of a faint burst
  83. GRB 091112: Swift detection of a possible burst
  84. GRB 091111: BOOTES-3 contemporaneous imaging
  85. GRB 091111: BOOTES-3 observations
  86. GRB 091109A: GROND and VLT observations
  87. GRB 091109B: Swift/UVOT Upper Limits
  88. GRB 091109B: Enhanced Swift-XRT position
  89. GRB 091109B: Optical limits from Watcher
  90. GRB 091109B: ROTSE-III Optical Limits
  91. GRB 091109B: Swift detection of a short burst
  92. GRB 091030: Fermi GBM detection
  93. GRB 091109: BOOTES-3 observations
  94. GRB 091109: Swift/UVOT observations
  95. GRB 091109: Enhanced Swift-XRT position
  96. GRB091109: REM detection of the NIR afterglow
  97. GRB 091109: Swift detection of a burst with optical afterglow
  98. GRB 091029: Observations from Stardome Observatory
  99. GRB 091104: Swift/UVOT Upper Limits
  100. GRB091026 : IRSF NIR upper limit

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