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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

32549 results found.

  1. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  2. GRB 081104: refined XRT analysis
  3. GRB 081104: Swift-BAT refined analysis
  4. GRB081104: Swift/UVOT Upper Limits
  5. Fermi-GBM detection of a Solar Flare
  6. Fermi Detection of GRB 081102
  7. GRB 081104 : Faulkes Telescope South observations
  8. GRB 081104: Swift-XRT position
  9. Radio observation of GRB 080130 with ATCA
  10. GRB 081102: MASTER prompt optical limit
  11. GRB 081102: Swift-XRT refined analysis
  12. GRB 081102: Swift/UVOT refined analysis
  13. GRB 081102: Swift-BAT refined analysis
  14. Radio observation of GRB 080218b with ATCA
  15. Radio observation of GRB 080229a with ATCA
  16. GRB 081102: MASTER VWF promt observation
  17. GRB 081102: OPTIMA-Burst optical upper limit
  18. SGR 0501+4516: optical observations in August
  19. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  20. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  21. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  22. GRB 081024B: BTA deep optical observations
  23. GRB 081028: CrAO optical observations
  24. GRB 081024B: new Swift-XRT observations
  25. Radio observation of GRB 080229b with ATCA
  26. GRB 081029, SMARTS optical/IR afterglow observations
  27. GRB 081024B: VLA radio observation
  28. GRB 081029: PROMPT Detections
  29. GRB 081029: Redshift Confirmation from Gemini-South
  30. GRB 081029: Swift-BAT refined analysis
  31. GRB081029: Swift XRT refined analysis
  32. GRB 081025: Suzaku WAM observation of the prompt emission
  33. GRB 081024B: Suzaku WAM observation of the prompt emission
  34. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  35. GRB 081029: REM observations
  36. Radio observation of GRB 080303 with ATCA
  37. Radio observation of GRB 080411 with ATCA
  38. GRB 081029: UVES/VLT Absorption Redshift
  39. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  40. GRB 081029: ROTSE-III Detection of Optical Counterpart
  41. GRB 081028: Magellan redshift
  42. GRB081028: UVOT detection of a brightening afterglow
  43. Swift UVOT observations of GRB081028
  44. GRB 081028: Swift-XRT refined analysis
  45. GRB 081028, Swift-BAT refined analysis
  46. GRB 081028: TAROT Calern observatory optical observations
  47. GRB 081028: optical observations at the NOT
  48. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  49. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  50. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  51. GRB 081025: TLS upper limits
  52. GRB 081024: No radio detection with the VLA
  53. GRB081024B: P200 Observations
  54. GRB 081024B: Swift-XRT further observations
  55. GRB 081025 BAT refined analysis
  56. Swift UVOT observations of GRB081025
  57. Swift UVOT observations of GRB081024B
  58. Konus-Wind observation of GRB 081025
  59. GRB 081025: Swift-XRT position
  60. GRB 081024B: Swift-XRT observations
  61. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  62. Swift UVOT observations of GRB 081024
  63. GRB 081024: Swift-XRT refined analysis
  64. GRB 081024, Swift-BAT refined analysis
  65. GRB 081024: Faulkes Telescope North optical observations
  66. GRB 081024: KAIT Optical Limits
  67. GRB 081024: Early Super-LOTIS Observations
  68. GRB 081024A: ROTSE-III Optical Limits
  69. GRB 081022, Swift-BAT refined analysis
  70. GRB 081016A: Swift-XRT refined analysis
  71. GRB 081012: Swift-XRT Refined Analysis
  72. Swift trigger 332287 is not a GRB
  73. GRB 081017, Swift-BAT refined analysis
  74. GRB 081017: REM early observations
  75. GRB 081016B, Swift-BAT refined analysis
  76. GRB 081016B: Swift/UVOT Upper Limits
  77. GRB 081011: Swift XRT refined analysis
  78. GRB 081016B: Swift-XRT Team refined Analysis
  79. GRB 081016B: ROTSE-III Optical Limits
  80. GRB 081016: Swift-XRT candidate afterglow detection
  81. Detection of flare star Algol in Swift-BAT slew data
  82. GRB 081012: GROND upper limits
  83. GRB 081008: Galaxy associated with z=1.967 absorber
  84. GRB 081012: Fermi GBM detection
  85. GRB 081007 and GRB 081007B: Fermi GBM detection
  86. GRB 080430: optical observations
  87. GRB 081008 optical upper limit
  88. GRB 081012: Observations from NOT
  89. GRB 081012: Swift/UVOT analysis of initial observations
  90. GRB 081012: Swift/XRT detection
  91. GRB 081012, Swift-BAT refined analysis
  92. GRB 081012: ROTSE-III Optical Limits
  93. Revised table for GRB 081011 UVOT detections
  94. GRB081011: UVOT detection of an optical afterglow
  95. GRB 081011: Swift/XRT detection
  96. GRB 081011, Swift-BAT refined analysis
  97. GRB 081008, SMARTS optical/IR afterglow observations
  98. GRB 081007: Radio Detection
  99. Konus-Wind observation of GRB 081001
  100. GRB 081007: Rapid PROMPT Detections

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