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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"

19538 results found.

  1. GRB 081126: Confirmation of the Optical Afterglow
  2. GRB 081127: Swift-BAT refined analysis
  3. GRB 081126: Swift-XRT refined analysis
  4. GRB 081127: Swift detection of a burst
  5. GRB 081126: Swift/UVOT Observations
  6. GRB 081126: optical observations
  7. GRB 081126: Swift-BAT refined analysis
  8. GRB 081126: Enhanced Swift-XRT position
  9. GRB 081126: TAROT Calern observatory optical observations
  10. GRB 081126: Swift detection of a burst
  11. Konus-Wind observation of GRB 081121
  12. GRB081121: Fermi GBM detection
  13. GRB081121: Refined Swift/UVOT observations
  14. GRB 081121: Swift-XRT refined analysis
  15. GRB 081121: Enhanced Swift-XRT position
  16. GRB 081121: GROND observations
  17. GRB 081121: Swift-BAT refined analysis
  18. GRB081121: Swift/UVOT observations
  19. GRB 081121: Swift detection of a burst
  20. GRB 081121: ROTSE-III Detection of Optical Counterpart
  21. GRB081118 : optical upper limit
  22. GRB 081118: Swift-XRT refined analysis
  23. GRB 081118: GROND detection of afterglow
  24. GRB 081118: Swift UVOT Upper Limits
  25. GRB 081118: Swift-BAT refined analysis
  26. GRB 081118: Enhanced Swift-XRT position
  27. GRB 081118: Swift detection of a burst
  28. GRB 081109A: confirmation of possible detection host galaxy
  29. Further Swift-XRT observations of the probable GRB 081105.
  30. GRB 081102: RTT150 Optical observations
  31. GRB 081109: TAROT La Silla observatory optical observations
  32. GRB 081102: MASTER refind and final results
  33. GRB 081109: GROND redshift limit and host extinction
  34. GRB 081025: Swift-XRT further analysis
  35. GRB 081024B: Swift-XRT late-time observations
  36. Swift-BAT refined analysis of trigger 334129
  37. GRB 081109B: Swift/UVOT refined analysis
  38. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  39. GRB 081109A: Possible Swift-UVOT detection
  40. GRB 081109A, Swift-BAT refined analysis
  41. GRB 081109A: Swift-XRT refined analysis
  42. GRB 081109: Fermi GBM detection
  43. GRB 081109: Swift/UVOT upper limits
  44. Swift-BAT Trigger 334129: possible burst
  45. GRB 081109: Swift detection of a burst
  46. GRB 081105: GROND Upper Limits
  47. UVOT/Swift observations of GRB081105
  48. Swift-XRT observations of GRB 081105
  49. GRB 081105 Swift/BAT and IPN Localization
  50. GRB 081025: Fermi GBM observation
  51. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  52. GRB 081104: refined XRT analysis
  53. GRB 081104: Enhanced Swift-XRT position
  54. GRB 081104: Swift-BAT refined analysis
  55. GRB081104: Swift/UVOT Upper Limits
  56. Fermi Detection of GRB 081102
  57. GRB 081104: Swift-XRT position
  58. GRB 081104: Swift detection of a burst
  59. GRB 081102: MASTER prompt optical limit
  60. GRB 081102: Swift-XRT refined analysis
  61. GRB 081102: Swift/UVOT refined analysis
  62. GRB 081102: Swift-BAT refined analysis
  63. GRB 081102: Enhanced Swift-XRT position
  64. Radio observation of GRB 080218b with ATCA
  65. GRB 081102: MASTER VWF promt observation
  66. GRB 081102: Swift detection of a burst
  67. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  68. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  69. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  70. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  71. GRB 081024B: BTA deep optical observations
  72. GRB 081028: CrAO optical observations
  73. GRB 081024B: new Swift-XRT observations
  74. Radio observation of GRB 080229b with ATCA
  75. GRB 081029: UVOT Detection of the Optical Afterglow
  76. GRB 081029: Swift-BAT refined analysis
  77. GRB081029: Swift XRT refined analysis
  78. GRB 081029: Enhanced Swift-XRT position
  79. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  80. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  81. GRB 081029: ROTSE-III Detection of Optical Counterpart
  82. GRB 081029: Swift detection of a burst
  83. GRB081028: UVOT detection of a brightening afterglow
  84. Swift UVOT observations of GRB081028
  85. GRB 081028: Swift-XRT refined analysis
  86. GRB 081028, Swift-BAT refined analysis
  87. GRB 081028: Enhanced Swift-XRT position
  88. GRB 081028: TAROT Calern observatory optical observations
  89. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  90. GRB 081028: Swift detection of a burst
  91. GRB 081024: No radio detection with the VLA
  92. GRB081025: RTT150 optical observations
  93. GRB 081024B: Swift-XRT further observations
  94. GRB 081025 BAT refined analysis
  95. Swift UVOT observations of GRB081025
  96. Swift UVOT observations of GRB081024B
  97. Konus-Wind observation of GRB 081025
  98. GRB 081025: Swift-XRT position
  99. GRB 081024B: Swift-XRT observations
  100. GRB 081025: Burst detection from Swift-BAT slew data

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