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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"

24414 results found.

  1. NOT observation of GRB100115A localization
  2. GRB 100115A: SARA Afterglow Candidate
  3. GRB 100111A: PAIRITEL NIR Upper Limits
  4. GRB 100111A: Swift-BAT refined analysis
  5. GRB 100111A: Fermi GBM observation
  6. GRB 100111A: Swift detection of a burst with an optical afterglow
  7. Swift/BAT Detects an Outburst from XTE J1901+014
  8. GRB 100103A: GROND Upper Limits
  9. Konus-Wind observation of GRB 100103A
  10. GRB 100103A: a long GRB detected with INTEGRAL
  11. Swift Trigger 381591: Retraction of Reported UVOT Source
  12. Swift Trigger 381591 is probably not a burst
  13. Trigger 381591: Swift detection of a possible burst
  14. GRB 091230: a long GRB detected by INTEGRAL
  15. GRB 091221: Skynet/PROMPT Detections
  16. GRB 091221: Fermi GBM Observation
  17. GRB 091117: Swift-XRT late time observations
  18. GRB 091221 Swift-BAT refined analysis
  19. GRB 091221: ROTSE-III Detection of Optical Counterpart
  20. Swift trigger 379449 (possible GRB) is not a burst
  21. GRB 091215: Faulkes Telescope North observations
  22. GRB 091208B: Xinglong TNT optical observation
  23. GRB 091208A: Suzaku WAM observation of the prompt emission
  24. Konus-Wind observation of GRB 091208A
  25. GRB 091208B: GROND observations
  26. GRB091208B: Swift/UVOT refined analysis
  27. GRB 091208B: Fermi GBM observation
  28. GRB 091208B, Swift-BAT refined analysis
  29. GRB 091208A Swift-BAT refined analysis
  30. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  31. GRB 091208A, RIMOTS optical upper limits
  32. GRB 091208B, RIMOTS optical upper limits
  33. GRB 091208B: BOOTES-3 optical afterglow
  34. GRB 091208: ROTSE-III Optical Limits
  35. GRB 091208: Swift detection of a burst
  36. A small revision to the GRB-naming convention
  37. GRB 091123: Suzaku WAM observation of the prompt emission
  38. GRB 091127, SMARTS optical/IR afterglow observations
  39. GRB091202: Swift-XRT refined analysis
  40. GRB 091202: Liverpool Telescope observations
  41. GRB 091127: Zadko Telescope Observations
  42. GRB 091126A: Suzaku WAM observation of the prompt emission
  43. GRB 091202: Liverpool Telescope Observations
  44. GRB 091202: a long GRB detected by INTEGRAL
  45. GRB 091117: Chandra Observations
  46. GRB 091020: MASTER-Net optical polarization observations
  47. Konus-Wind observation of very long GRB 091123
  48. GRB 091130A: Xinglong TNT upper limit
  49. GRB 091123: Fermi GBM detection of a very long burst
  50. GRB 091126B: Fermi GBM detection
  51. GRB 091127: Suzaku WAM observation of the prompt emission
  52. GRB 091126: Fermi GBM detection
  53. GRB 091130B: Swift-BAT refined analysis
  54. GRB 091127: Skynet/PROMPT Observations of Fading
  55. Swift trigger 377436 (possible GRB 091130A) is not a burst
  56. GRB 091130B: MASTER observations
  57. GRB 091130B: SDSS galaxy at XRT location
  58. GRB 091130: MASTER observations
  59. GRB 091130: Swift detection of a possible burst
  60. GRB 091128: Fermi GBM detection
  61. Konus-Wind observation of GRB 091127
  62. GRB 091127: Fermi GBM detection
  63. GRB 091127: MASTER early optical transient polarimetry
  64. GRB 091127: Swift-BAT refined analysis
  65. GRB 091127: REM NIR afterglow detection
  66. GRB 091127: Liverpool Telescope afterglow candidate
  67. GRB 091127: Swift detection of a burst
  68. Konus-Wind observation of GRB 091120
  69. GRB 091120: MAXI GSC detection
  70. GRB 091120: Fermi GBM observation
  71. GRB 091117A: Suzaku WAM observation of the prompt emission
  72. GRB 091117 BAT refined analysis
  73. GRB091117: Gemini South Observations
  74. Konus-Wind observations of GRB 091117A
  75. GRB 091112: Suzaku WAM observation of the prompt emission
  76. GRB 091102A: Suzaku WAM observation of the prompt emission
  77. GRB 091109B: Suzaku WAM observation of the prompt emission
  78. GRB091111: Swift XRT refined analysis
  79. Konus-Wind and Konus-RF observations of GRB 091031
  80. GRB 091112: Swift-BAT refined analysis
  81. GRB 091112: Fermi GBM observation
  82. GRB 091031: Fermi LAT detection of a faint burst
  83. GRB 091111: BOOTES-3 contemporaneous imaging
  84. GRB 091111: BOOTES-3 observations
  85. GRB 091111: a faint long GRB detected with INTEGRAL
  86. GRB 091109A: GROND and VLT observations
  87. GRB 091109B: VLT afterglow confirmation
  88. GRB 091109B: Swift-XRT Team refined analysis
  89. GRB 091109B: Swift-BAT refined analysis
  90. GRB 091109B: Optical limits from Watcher
  91. GRB 091109B: ROTSE-III Optical Limits
  92. GRB 091030: Fermi GBM detection
  93. GRB 091109: Faulkes Telescope South observations
  94. GRB 091109: Swift-BAT refined analysis
  95. GRB 091029: Observations from Stardome Observatory
  96. GRB 091104: Swift-BAT refined analysis
  97. GRB 091102: LABOCA/APEX submm observations
  98. Fermi LAT Upper Limits on GRB 091010
  99. GRB 091102A: Fermi GBM observation
  100. GRB 091102: GROND Upper Limits

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