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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"

14950 results found.

  1. GRB 130102A: Swift detection of a burst
  2. GRB 121229A: MAXI/GSC detection
  3. GRB 121229A: GROND detection of the afterglow
  4. GRB 121229A: Swift detection of a burst
  5. GRB 121226A: BOOTES-4/MET optical observations
  6. GRB 121226A: Swift detection of a burst
  7. Konus-Wind observation of GRB 121225B
  8. GRB 121225B: Fermi LAT Detection
  9. GRB 121225A: MAXI/GSC detection
  10. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  11. GRB 121217A: Swift/UVOT Detection
  12. GRB 121217A: GROND Detection of the Afterglow
  13. GRB 121217A: Swift detection of a burst
  14. GRB 121209A: LOAO Observation
  15. GRB 121212A: LOAO IzY Observation
  16. GRB 121209A: MAXI/GSC detection
  17. GRB 121212A: Keck observations
  18. GRB121212A: Swift/UVOT Detection
  19. GRB 121212A: A long GRB detected by INTEGRAL
  20. GRB 121212A: Swift detection of a burst
  21. GRB 121211A: Swift/UVOT Detection
  22. GRB 121211A: Keck/LRIS redshift
  23. GRB 121211A: Swift detection of a burst with an optical counterpart
  24. GRB 121209A: Keck observations
  25. GRB 121209A: Swift detection of a burst
  26. GRB 121202A: Swift detection of a burst
  27. GRB 121201A: Swift/UVOT Detection
  28. GRB 121128A: Swift/UVOT Detection
  29. GRB 121122A: Fermi GBM observation
  30. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  31. GRB 121128A: Swift detection of a burst with an optical counterpart
  32. Konus-Wind observation of GRB 121122A
  33. GRB 121123A: Swift/UVOT Observations
  34. GRB 121125A: Swift/UVOT Detection
  35. GRB 121125A: Swift detection of a burst with optical counterpart
  36. GRB 121123A: Swift detection of a burst with optical counterpart
  37. Konus-Wind observation of GRB 121118B
  38. GRB 121117A: Swift detection of a burst
  39. Trigger 538084: Swift detection of XTE J1739-302
  40. GRB 121108A: Swift detection of a burst
  41. GRB 121031A: Fermi GBM detection
  42. GRB 121029A Suzaku WAM observation of the prompt emission
  43. GRB 121102A: Swift detection of a burst
  44. GRB 121031A: Swift detection of a burst
  45. GRB 121027A: Swift/UVOT Possible Detection
  46. GRB 121028A: near-IR observations at Calar Alto
  47. GRB 121027A: GROND Confirmation of Rebrightening
  48. GRB 121029A: Fermi GBM detection
  49. GRB 121028A: Swift detection of a burst
  50. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  51. GRB 121027A: Swift detection of a burst
  52. GRB 121024A: EVLA Detection
  53. GRB 121024A: CARMA 3mm Detection
  54. GRB 121024A: GMG optical observation
  55. GRB 121025A: MAXI/GSC detection
  56. GRB 121024A: PAIRITEL NIR Detection
  57. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  58. GRB 121024A: VLT/X-shooter redshift
  59. GRB 121024A: BOOTES-1B optical detection
  60. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  61. GRB 121024A: Swift detection of a burst with an optical counterpart
  62. GRB 121017A: BOOTES-2/TELMA observations
  63. GRB 121017A: Swift detection of a burst
  64. GRB 121011A Suzaku WAM observation of the prompt emission
  65. GRB 121012A: Fermi GBM detection
  66. PdB IRAM observation of GRB 121011A
  67. GRB 121014A: Swift detection of a burst
  68. GRB 121011A: Swift/UVOT Detection
  69. GRB 121011A: NOT redshift retraction
  70. GRB 121011A: Fermi-LAT detection of a burst
  71. GRB 121011A: MASTER-Net bell light curve
  72. GRB 121011A: Swift detection of a burst with optical afterglow
  73. Trigger 535747: Swift detection of an outburst from SGR1806-20
  74. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  75. GRB 120923A: JHK Observation
  76. GRB 120927A: Swift detection of a burst
  77. Further Swift-XRT observations of the GRB 120919A field.
  78. GRB 120921A: Fermi GBM detection of its 1000th GRB
  79. GRB 120923A: RAPTOR Early Afterglow Limits
  80. GRB 120916A Suzaku WAM observation of the prompt emission
  81. GRB 120922A: GROND photometric redshift
  82. GRB 120922A: Fermi GBM detection
  83. GRB 120922A: Swift/UVOT Detection
  84. GRB 120923A: Gemini afterglow detection, high-z candidate
  85. GRB 120923A: Swift detection of a burst
  86. GRB 120922A: Swift detection of a burst
  87. Konus-Wind observation of GRB 120919B
  88. Konus-Wind observation of GRB 120919A
  89. IPN Triangulation of long GRB 120919A
  90. GRB 120919A: Fermi GBM detection
  91. Konus-Wind observation of GRB 120916A
  92. GRB 120918A: Swift detection of a burst
  93. IPN Triangulation of long GRB 120916A
  94. GRB 120916A: Fermi-LAT detection of a burst
  95. Swift Trigger 533836 is a new Galactic transient
  96. GRB 120913B: FRAM early follow up and detection
  97. GRB 120913B: REM NIR early time detection
  98. GRB 120913B: TAROT La Silla observatory optical detection
  99. GRB 120913B: Swift detection of a burst
  100. GRB 120913A: Swift detection of a burst

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