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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"

23624 results found.

  1. Konus-Wind observation of GRB 091208A
  2. GRB091208A: Swift/UVOT refined analysis
  3. GRB 091208B: Keck HIRES redshift confirmation
  4. GRB 091208B: GROND observations
  5. GRB091208B: Swift/UVOT refined analysis
  6. GRB 091208B, Swift-BAT refined analysis
  7. GRB 091208A Swift-BAT refined analysis
  8. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  9. GRB 091208B: MITSuME Okayama Optical Observation
  10. GRB 091208B: Swift detection of a burst with an optical afterglow
  11. GRB 091208B: BOOTES-3 optical afterglow
  12. GRB 091208: Swift detection of a burst
  13. Short X-ray Transient, RIMOTS optical upper limits
  14. A small revision to the GRB-naming convention
  15. GRB 091123: Suzaku WAM observation of the prompt emission
  16. GRB 091127: Skynet/PROMPT Observations of Possible Host Galaxy
  17. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  18. GRB 091109A: GROND confirmation of redshift z = 3.5
  19. GRB 091202: Liverpool Telescope observations
  20. GRB 091202: Optical and NIR observations
  21. GRB 091127: Zadko Telescope Observations
  22. GRB 091126A: Suzaku WAM observation of the prompt emission
  23. GRB 091202: TAROT Calern observatory optical observations
  24. GRB 091202: Liverpool Telescope Observations
  25. GRB 091202: a long GRB detected by INTEGRAL
  26. GRB 091117: Chandra Observations
  27. GRB 091020: MASTER-Net optical polarization observations
  28. GRB 091127: Skynet/PROMPT Continued Observations of Fading
  29. Short X-ray Transient Detection by MAXI/GSC
  30. Konus-Wind observation of very long GRB 091123
  31. GRB 091123: Fermi GBM detection of a very long burst
  32. GRB 091126B: Fermi GBM detection
  33. GRB 091127: Suzaku WAM observation of the prompt emission
  34. GRB 091126: Fermi GBM detection
  35. GRB 091130B: Swift-BAT refined analysis
  36. GRB 091127: Skynet/PROMPT Observations of Fading
  37. GRB 091130B: Swift detection of a burst
  38. GRB 091130: Swift detection of a possible burst
  39. Konus-Wind observation of GRB 091127
  40. GRB 091127: TAROT La Silla observatory optical observations
  41. GRB 091127: optical observations
  42. GRB 091127: LABOCA/APEX submm observations
  43. GRB 091127: TAROT La Silla observatory optical decay
  44. GRB 091127: CAHA 1.23m I-band observations
  45. GRB 091127: Swift-BAT refined analysis
  46. GRB 091127 : GROND observations
  47. GRB 091127: Liverpool Telescope afterglow candidate
  48. GRB 091127: Swift detection of a burst
  49. IPN Triangulation of GRB091120
  50. Konus-Wind observation of GRB 091120
  51. GRB 091117A: Suzaku WAM observation of the prompt emission
  52. GRB 091117: TNG optical observations
  53. GRB 091117A: Swift/UVOT followup observations
  54. GRB 091117: 2nd epoch of Magellan optical observations
  55. GRB 091117: Swift-XRT observations
  56. GRB 091117 BAT refined analysis
  57. GRB091117: Gemini South Observations
  58. GRB 091117: Swift XRT refined analysis
  59. Konus-Wind observations of GRB 091117A
  60. GRB 091117: Magellan optical observations
  61. GRB 091112: Suzaku WAM observation of the prompt emission
  62. GRB 091102A: Suzaku WAM observation of the prompt emission
  63. GRB 091109B: Suzaku WAM observation of the prompt emission
  64. GRB091111: Swift XRT refined analysis
  65. Konus-Wind and Konus-RF observations of GRB 091031
  66. GRB 091112: Swift-BAT refined analysis
  67. GRB 091112: Fermi GBM observation
  68. GRB 091031: Fermi LAT detection of a faint burst
  69. GRB 091112: Swift detection of a possible burst
  70. GRB 091111: BOOTES-3 contemporaneous imaging
  71. GRB 091111: BOOTES-3 observations
  72. GRB 091111: a faint long GRB detected with INTEGRAL
  73. GRB 091109b: Magellan Observations
  74. GRB 091109B: Swift-BAT refined analysis
  75. GRB 091109B: Optical limits from Watcher
  76. GRB 091109B: Swift detection of a short burst
  77. GRB 091109: BOOTES-3 observations
  78. GRB 091109: Faulkes Telescope South observations
  79. GRB 091109: Swift-BAT refined analysis
  80. GRB 091109: Swift detection of a burst with optical afterglow
  81. GRB 091029: Observations from Stardome Observatory
  82. GRB 091104: Swift-BAT refined analysis
  83. GRB091026 : IRSF NIR upper limit
  84. GRB 091104: Swift detection of a burst
  85. GRB 091102: LABOCA/APEX submm observations
  86. GRB 091102: GROND Upper Limits
  87. GRB 091102: BOOTES-3 observations
  88. GRB 091102: Swift-BAT refined analysis
  89. GRB 091102: Swift detection of a burst
  90. GRB 091031: Fermi GBM detection
  91. GRB 091024: Fermi LAT upper limits
  92. GRB 091018: Skynet/PROMPT Observations of Possible Host Galaxy
  93. GRB 090920: Skynet/DSO Detection
  94. GRB 091029: Skynet/PROMPT Continued Observations of Fading
  95. GRB 091029: BOOTES-3 observations
  96. GRB 091029: Swift-BAT refined analysis
  97. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  98. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  99. GRB 091029: Swift detection of a burst with an optical counterpart
  100. GRB 091026: Suzaku WAM observation of the prompt emission

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