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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"

32767 results found.

  1. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  2. GRB 081109A: Possible Swift-UVOT detection
  3. GRB 081109A: Faulkes Telescope South observations
  4. GRB 081109A, Swift-BAT refined analysis
  5. GRB 081109A: Swift-XRT refined analysis
  6. GRB 081109: Fermi GBM detection
  7. GRB 081109: Swift/UVOT upper limits
  8. GRB 081109A optical upper limit
  9. GRB 081109: REM NIR afterglow detection
  10. GRB 081028 - PAIRITEL NIR detection
  11. GRB 081104: GROND found no Optical/NIR Afterglow
  12. GRB 081105: GROND Upper Limits
  13. Radio observation of GRB 080523 with ATCA
  14. Radio observation of GRB 080520 with ATCA
  15. UVOT/Swift observations of GRB081105
  16. Swift-XRT observations of GRB 081105
  17. Radio observation of GRB 080516 with ATCA
  18. GRB 081025: Fermi GBM observation
  19. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  20. GRB 081104: refined XRT analysis
  21. GRB 081104: Swift-BAT refined analysis
  22. GRB081104: Swift/UVOT Upper Limits
  23. Fermi-GBM detection of a Solar Flare
  24. Fermi Detection of GRB 081102
  25. GRB 081104 : Faulkes Telescope South observations
  26. GRB 081104: Swift-XRT position
  27. Radio observation of GRB 080130 with ATCA
  28. GRB 081102: MASTER prompt optical limit
  29. GRB 081102: Swift-XRT refined analysis
  30. GRB 081102: Swift/UVOT refined analysis
  31. GRB 081102: Swift-BAT refined analysis
  32. Radio observation of GRB 080218b with ATCA
  33. Radio observation of GRB 080229a with ATCA
  34. GRB 081102: MASTER VWF promt observation
  35. GRB 081102: OPTIMA-Burst optical upper limit
  36. SGR 0501+4516: optical observations in August
  37. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  38. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  39. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  40. GRB 081024B: BTA deep optical observations
  41. GRB 081028: CrAO optical observations
  42. GRB 081024B: new Swift-XRT observations
  43. Radio observation of GRB 080229b with ATCA
  44. GRB 081029, SMARTS optical/IR afterglow observations
  45. GRB 081024B: VLA radio observation
  46. GRB 081029: PROMPT Detections
  47. GRB 081029: Redshift Confirmation from Gemini-South
  48. GRB 081029: Swift-BAT refined analysis
  49. GRB081029: Swift XRT refined analysis
  50. GRB 081025: Suzaku WAM observation of the prompt emission
  51. GRB 081024B: Suzaku WAM observation of the prompt emission
  52. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  53. GRB 081029: REM observations
  54. Radio observation of GRB 080303 with ATCA
  55. Radio observation of GRB 080411 with ATCA
  56. GRB 081029: UVES/VLT Absorption Redshift
  57. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  58. GRB 081029: ROTSE-III Detection of Optical Counterpart
  59. GRB 081028: Magellan redshift
  60. GRB081028: UVOT detection of a brightening afterglow
  61. Swift UVOT observations of GRB081028
  62. GRB 081028: Swift-XRT refined analysis
  63. GRB 081028, Swift-BAT refined analysis
  64. GRB 081028: TAROT Calern observatory optical observations
  65. GRB 081028: optical observations at the NOT
  66. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  67. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  68. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  69. GRB 081025: TLS upper limits
  70. GRB 081024: No radio detection with the VLA
  71. GRB081024B: P200 Observations
  72. GRB 081024B: Swift-XRT further observations
  73. GRB 081025 BAT refined analysis
  74. Swift UVOT observations of GRB081025
  75. Swift UVOT observations of GRB081024B
  76. Konus-Wind observation of GRB 081025
  77. GRB 081025: Swift-XRT position
  78. GRB 081024B: Swift-XRT observations
  79. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  80. Swift UVOT observations of GRB 081024
  81. GRB 081024: Swift-XRT refined analysis
  82. GRB 081024, Swift-BAT refined analysis
  83. GRB 081024: Faulkes Telescope North optical observations
  84. GRB 081024: KAIT Optical Limits
  85. GRB 081024: Early Super-LOTIS Observations
  86. GRB 081024A: ROTSE-III Optical Limits
  87. GRB 081022, Swift-BAT refined analysis
  88. GRB 081016A: Swift-XRT refined analysis
  89. GRB 081012: Swift-XRT Refined Analysis
  90. Swift trigger 332287 is not a GRB
  91. GRB 081017, Swift-BAT refined analysis
  92. GRB 081017: REM early observations
  93. GRB 081016B, Swift-BAT refined analysis
  94. GRB 081016B: Swift/UVOT Upper Limits
  95. GRB 081011: Swift XRT refined analysis
  96. GRB 081016B: Swift-XRT Team refined Analysis
  97. GRB 081016B: ROTSE-III Optical Limits
  98. GRB 081016: Swift-XRT candidate afterglow detection
  99. Detection of flare star Algol in Swift-BAT slew data
  100. GRB 081012: GROND upper limits

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