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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"

28247 results found.

  1. GRB 121011A: Enhanced Swift-XRT position
  2. GRB 121011A: MITSuME Okayama Optical Observation
  3. GRB 121011A: Swift detection of a burst with optical afterglow
  4. Trigger 535747: Swift detection of an outburst from SGR1806-20
  5. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  6. GRB 120927A: optical upper limit
  7. GRB 120804A: Late-time Chandra observation
  8. GRB 121001A: GROND Afterglow Confirmation
  9. GRB 121001A: Swift/UVOT Upper Limits
  10. GRB 121001A: Swift-XRT refined Analysis
  11. GRB 121001A: Enhanced Swift-XRT Position
  12. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  13. GRB 121001A: possible optical counterpart
  14. Swift Trigger 535026: ROTSE-III Optical Limits
  15. Swift Trigger 535026: Galactic Transient or possible GRB
  16. GRB 120927A: Swift/UVOT Upper Limits
  17. GRB 120927A: GROND upper limits
  18. GRB 120927A: Swift-XRT refined Analysis
  19. GRB 120927A: Enhanced Swift-XRT position
  20. GRB 120923A: JHK Observation
  21. GRB 120927A: Swift detection of a burst
  22. Further Swift-XRT observations of the GRB 120919A field.
  23. GRB 120921A: Fermi GBM detection of its 1000th GRB
  24. GRB 120923A: RAPTOR Early Afterglow Limits
  25. GRB 120923A: MITSuME Okayama Optical upper limits
  26. GRB 120916A Suzaku WAM observation of the prompt emission
  27. GRB 120923A: CARMA Observations
  28. GRB 120923A: EVLA Observations
  29. GRB 120923A: Swift-XRT refined Analysis
  30. GRB 120922A: GROND photometric redshift
  31. GRB 120922A: Fermi GBM detection
  32. GRB 120922A: Swift/UVOT Detection
  33. GRB 120923A: Swift/UVOT Upper Limit
  34. GRB 120922A: Swift-XRT refined Analysis
  35. GRB 120922A: Swift/UVOT Observations
  36. GRB 120923A: Gemini afterglow detection, high-z candidate
  37. GRB 120923A: Enhanced Swift-XRT position
  38. GRB 120922A: Enhanced Swift-XRT position
  39. GRB 120923A: TAROT La Silla observatory optical observations
  40. GRB 120923A: Swift detection of a burst
  41. GRB 120922A: GROND afterglow candidate
  42. GRB 120922A: Prompt enhanced Swift-XRT position
  43. GRB 120922A: Swift detection of a burst
  44. GRB 120919A: Swift/UVOT Upper Limits
  45. GRB 120919A: Swift-XRT observations
  46. Konus-Wind observation of GRB 120919B
  47. Konus-Wind observation of GRB 120919A
  48. IPN Triangulation of long GRB 120919A
  49. GRB 120919A: Fermi GBM detection
  50. Swift trigger 534017 was not an astrophysical event
  51. Konus-Wind observation of GRB 120916A
  52. Swift Trigger 534017 is probably not real.
  53. GRB 120918A: Swift detection of a burst
  54. IPN Triangulation of long GRB 120916A
  55. GRB 120916A: Fermi-LAT detection of a burst
  56. Swift Trigger 533836 is a new Galactic transient
  57. GRB 120913B: FRAM early follow up and detection
  58. GRB 120913B: REM NIR early time detection
  59. GRB 120913B: TAROT La Silla observatory optical photometry
  60. GRB 120913B: TAROT La Silla observatory optical detection
  61. GRB 120913B: Swift detection of a burst
  62. GRB 120913A: Swift detection of a burst
  63. GRB 120907A: optical observations of ISON-Kislovodsk
  64. GRB 120911A: optical upper limit CrAO
  65. GRB 120911A: optical upper limit ISON-NM
  66. Konus-Wind observation of GRB 120911B
  67. GRB 120911B: Fermi-LAT detection of a burst
  68. GRB120911A: MITSuME Okayama Optical upper limits
  69. GRB 120911A: Swift/UVOT Upper Limits
  70. GRB 120911A: Swift-XRT refined Analysis
  71. GRB 120911A: Enhanced Swift-XRT position
  72. GRB 120911A: Faulkes Telescope North observations
  73. GRB 120911A: Swift-XRT observations
  74. GRB 120911A: Swift detection of a burst
  75. GRB 120907A: SMA upper limits
  76. GRB 120908A: Fermi GBM detection
  77. GRB 120908A: Swift Observations
  78. GRB 120909A: Pi of the Sky upper limits
  79. GRB 120909A: Swift/UVOT Detection
  80. GRB 120909A: Swift-XRT refined Analysis
  81. GRB 120909A: Enhanced Swift-XRT position
  82. GRB 120908A: MAXI/GSC detection
  83. GRB 120909A: GROND detection of the afterglow
  84. GRB 120909A: Swift detection of a burst
  85. GRB 120907A: EVLA observations
  86. GRB 120907A: Swift/UVOT Detection
  87. GRB 120907A: Swift-XRT refined Analysis
  88. GRB 120907A: Spectroscopy from OSIRIS/GTC
  89. GRB 120907A: Enhanced Swift-XRT position
  90. GRB 120907A: Fermi GBM detection
  91. GRB 120907A: NOT optical observations
  92. GRB 120907A: ROTSE-III Optical Limits
  93. GRB 120907A: Swift detection of a burst with optical counterpart
  94. XMM observations of the short GRB120804A
  95. GRB 120819A: optical upper limit
  96. GRB 120802A: optical observations in CrAO
  97. GRB 120830A: Further Swift Observations
  98. GRB 120830A: Swift-XRT and UVOT observations
  99. Konus-Wind observation of GRB 120830A
  100. GRB 120830A: Fermi-LAT detection of a short burst

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