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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"

14880 results found.

  1. GRB 100205A: Keck limits on an underlying host galaxy
  2. GRB 100205A: BOAO/LOAO zYJK observation
  3. GRB 100205B: Fermi GBM detection
  4. GRB 100206A: optical observations from Southern Spain
  5. GRB 100206A: Swift detection of a short hard burst
  6. GRB 100205A: Gemini-N + NIRI photometry
  7. GRB 100130B: Fermi GBM detection
  8. GRB 100113A: Fermi GBM detection
  9. GRB 100205A: Swift UVOT upper limits
  10. GRB 100203A: Swift XRT and UVOT refined analyses
  11. GRB 100205A: Swift detection of a burst
  12. Short X-ray Transient detected by MAXI/GSC
  13. GRB 100131A: Fermi GBM detection
  14. GRB 100122A: Fermi GBM detection
  15. GRB091109A: VLT/FORS2 spectroscopic redshift
  16. GRB 100119A: Swift detection of a burst
  17. GRB 100117A: Fermi GBM detection
  18. GRB 100117A: Swift detection of a short hard burst
  19. GRB 100116A: Fermi LAT detection
  20. GRB 100116A: Fermi GBM detection
  21. NOT observation of GRB100115A localization
  22. GRB 100115A: SARA Afterglow Candidate
  23. GRB 100111A: Swift UVOT Refined Analysis
  24. GRB 100111A: Swift detection of a burst with an optical afterglow
  25. GRB 100103A: Swift/UVOT Upper Limits
  26. GRB 100103A: Swift/XRT position
  27. Swift Trigger 381591: Uncatalogued UVOT Source
  28. GRB 091230: Swift/UVOT Observations
  29. Trigger 381591: Swift detection of a possible burst
  30. Trigger 381434: Swift detection of a possible burst
  31. GRB 091221: UVOT Confirmation of an Optical Afterglow
  32. GRB 091221: ROTSE-III Detection of Optical Counterpart
  33. GRB 091221: Swift detection of a burst
  34. Trigger 379449: Swift detection of a possible burst
  35. GRB091208B: Swift/UVOT refined analysis
  36. GRB 091208B: Swift detection of a burst with an optical afterglow
  37. GRB 091208: Swift detection of a burst
  38. GRB 091117: Chandra Observations
  39. Short X-ray Transient Detection by MAXI/GSC
  40. GRB 091123: Fermi GBM detection of a very long burst
  41. GRB 091126B: Fermi GBM detection
  42. GRB 091126: Fermi GBM detection
  43. GRB 091130B: SDSS galaxy at XRT location
  44. GRB 091130B: Swift detection of a burst
  45. GRB 091130: Swift detection of a possible burst
  46. GRB 091128: Fermi GBM detection
  47. GRB 091127: Fermi GBM detection
  48. GRB 091127: Swift-XRT afterglow detection and analysis
  49. GRB 091127: REM NIR afterglow detection
  50. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  51. GRB 091127: Liverpool Telescope afterglow candidate
  52. GRB 091127: Swift detection of a burst
  53. GRB 091120: MAXI GSC detection
  54. GRB 091031: Fermi LAT detection of a faint burst
  55. GRB 091112: Swift detection of a possible burst
  56. GRB 091109B: Optical limits from Watcher
  57. GRB 091109B: Swift detection of a short burst
  58. GRB091109: Correction to GCN 10139
  59. GRB 091030: Fermi GBM detection
  60. GRB 091109: BOOTES-3 observations
  61. GRB091109: REM detection of the NIR afterglow
  62. GRB 091109: Swift detection of a burst with optical afterglow
  63. GRB 091104: Swift detection of a burst
  64. Fermi LAT Upper Limits on GRB 091010
  65. GRB 091102 : Faulkes Telescope South Upper Limits
  66. GRB 091102: BOOTES-3 observations
  67. GRB 091102: Swift detection of a burst
  68. GRB 091031: Fermi GBM detection
  69. GRB 091024: Fermi LAT upper limits
  70. GRB 090920: Skynet/DSO Detection
  71. GRB091029: Swift/UVOT observations
  72. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  73. GRB 091029: Swift detection of a burst with an optical counterpart
  74. GRB 091020: Late TLS detection
  75. Radio afterglow detection from GRB 091020
  76. GRB 091026: Swift detection of a Gamma Ray Burst
  77. GRB 091024: KAIT optical afterglow observations
  78. GRB 091024: Faulkes Telescope North Afterglow Candidate
  79. GRB 091024: Swift detection of a burst
  80. GRB091020 Swift/UVOT observations
  81. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  82. GRB 091020: Swift detection of a burst with an optical afterglow
  83. GRB 091018: VLT/X-shooter spectra
  84. GRB091018: Swift/UVOT observations
  85. GRB 091018: ROTSE-III Detection of Optical Counterpart
  86. GRB 091018: Swift detection of a burst with optical afterglow
  87. GRB 090726 R band observations
  88. GRB 091010: RXTE detection
  89. Detection of a short GRB 090929A by RT-2 Experiment
  90. GRB 091003: Lick observations and possible SDSS host galaxy
  91. GRB 091003: WHT ACAM observations
  92. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  93. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  94. GRB 091003A: Fermi LAT detection
  95. GRB 091003A: Fermi GBM detection
  96. GRB 090929A: Swift-XRT non-detection
  97. GRB 090929B: Swift/UVOT Observations
  98. GRB 090929B: Swift detection of a burst
  99. GRB 090929A: Fermi GBM detection
  100. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow

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