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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"

28050 results found.

  1. GRB 081025: Fermi GBM observation
  2. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  3. GRB 081104: refined XRT analysis
  4. GRB 081104: Enhanced Swift-XRT position
  5. GRB 081104: Swift-BAT refined analysis
  6. GRB 081104 : Faulkes Telescope South observations
  7. Radio observation of GRB 080130 with ATCA
  8. GRB 081102: MASTER prompt optical limit
  9. GRB 081102: Swift-XRT refined analysis
  10. GRB 081102: Swift-BAT refined analysis
  11. GRB 081102: Enhanced Swift-XRT position
  12. Radio observation of GRB 080218b with ATCA
  13. Radio observation of GRB 080229a with ATCA
  14. GRB 081102: MASTER VWF promt observation
  15. GRB 081102: Swift detection of a burst
  16. SGR 0501+4516: optical observations in August
  17. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  18. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  19. GRB 081024B: BTA deep optical observations
  20. GRB 081024B: new Swift-XRT observations
  21. Radio observation of GRB 080229b with ATCA
  22. GRB 081024B: VLA radio observation
  23. GRB 081029: UVOT Detection of the Optical Afterglow
  24. GRB 081029: Swift-BAT refined analysis
  25. GRB081029: Swift XRT refined analysis
  26. GRB 081025: Suzaku WAM observation of the prompt emission
  27. GRB 081029: Enhanced Swift-XRT position
  28. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  29. GRB 081029: REM observations
  30. Radio observation of GRB 080303 with ATCA
  31. Radio observation of GRB 080411 with ATCA
  32. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  33. GRB 081029: ROTSE-III Detection of Optical Counterpart
  34. GRB 081028B: Fermi GBM detection
  35. GRB 081021: Fermi GBM detection
  36. Swift UVOT observations of GRB081028
  37. GRB 081028: Swift-XRT refined analysis
  38. GRB 081028, Swift-BAT refined analysis
  39. GRB 081028: Enhanced Swift-XRT position
  40. GRB 081028: TAROT Calern observatory optical observations
  41. GRB 081028: optical observations at the NOT
  42. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  43. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  44. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  45. GRB 081028: Swift detection of a burst
  46. GRB 081024: No radio detection with the VLA
  47. GRB081025: RTT150 optical observations
  48. GRB081024B: P200 Observations
  49. GRB 081024B: Swift-XRT further observations
  50. GRB 081025 BAT refined analysis
  51. Swift UVOT observations of GRB081024B
  52. Konus-Wind observation of GRB 081025
  53. GRB 081025: Swift-XRT position
  54. GRB 081024B: Swift-XRT observations
  55. GRB 081025: Burst detection from Swift-BAT slew data
  56. GRB 081024: Swift-XRT refined analysis
  57. GRB 081024, Swift-BAT refined analysis
  58. GRB 081024: Enhanced Swift-XRT position
  59. GRB 081024: Faulkes Telescope North optical observations
  60. GRB 081024A: ROTSE-III Optical Limits
  61. GRB 081024: Swift detection of a burst
  62. GRB 081022, Swift-BAT refined analysis
  63. GRB 081016A: Swift-XRT refined analysis
  64. Swift detection of a possible burst (trigger 332287)
  65. GRB 081017, Swift-BAT refined analysis
  66. GRB 081017: REM early observations
  67. GRB 081016B, Swift-BAT refined analysis
  68. GRB 081011: Swift XRT refined analysis
  69. GRB 081016B: Swift-XRT Team refined Analysis
  70. GRB 081016B: Enhanced Swift-XRT position
  71. GRB 081016B: ROTSE-III Optical Limits
  72. GRB 081016B: Swift detection of a burst
  73. GRB 081011: Enhanced Swift-XRT position
  74. Swift detection of flare on CC Eri
  75. GRB 081016: A long GRB discovered by INTEGRAL
  76. Trigger 331721 Due to Swift startracker loss-of-lock
  77. Detection of flare star Algol in Swift-BAT slew data
  78. GRB 081009: Fermi GBM detection
  79. GRB 081012: GROND upper limits
  80. Swift-BAT triggered on the flare star Algol
  81. GRB 081012: Fermi GBM detection
  82. GRB 081007 and GRB 081007B: Fermi GBM detection
  83. GRB 080430: optical observations
  84. GRB 081012: Observations from NOT
  85. GRB 081012: Swift/XRT detection
  86. GRB 081012, Swift-BAT refined analysis
  87. GRB081011: UVOT detection of an optical afterglow
  88. GRB 081011: Swift/XRT detection
  89. GRB 081011, Swift-BAT refined analysis
  90. GRB 081008, SMARTS optical/IR afterglow observations
  91. GRB 081011: Swift detection of a burst
  92. GRB 081007: Radio Detection
  93. GRB 081008, Swift-BAT refined analysis
  94. GRB 081008: Swift-XRT Refined Analysis
  95. GRB081008: Swift/UVOT observations
  96. GRB 081008: Enhanced Swift-XRT position
  97. GRB 081008: Swift detection of a burst with optical afterglow
  98. GRB 081008: ROTSE-III Detection of Optical Counterpart
  99. GRB081006B: Fermi GBM detection
  100. GRB081006: Fermi GBM detection

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