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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"

19662 results found.

  1. GRB 081203A: optical observations
  2. Swift UVOT observations of GRB 081203A
  3. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  4. GRB081203A: Swift/UVOT grism redshift
  5. GRB 081203A: Burst detection from Swift-BAT slew data
  6. GRB 081203A: Swift-BAT refined analysis
  7. GRB 081203: Enhanced Swift-XRT position
  8. GRB081203: optical observation
  9. GRB 081203: Swift detection of a burst with a bright optical counterpart
  10. GRB 081128: optical observation
  11. Swift Trigger 335971: Swift/UVOT Observations
  12. GRB 081126: Fermi GBM detection
  13. Swift Trigger 335971 is probably not a real source
  14. Trigger 335971: Swift possible detection of a burst
  15. GRB081128: Swift/UVOT Upper Limits
  16. GRB 081128: Swift-XRT refined analysis
  17. GRB081128: optical observations
  18. GRB 081128: Swift-BAT refined analysis
  19. GRB 081128: Enhanced Swift-XRT position
  20. GRB 081128: Swift detection of a burst
  21. GRB 081126: Swift observations continuing
  22. GRB081126: Afterglow photometry from Crni Vrh
  23. GRB 081126: GRT Optical Observation
  24. GRB 081127: Swift/UVOT Upper Limits
  25. GRB 081127: Swift-XRT refined analysis
  26. GRB 081127: Enhanced Swift-XRT position
  27. GRB 081126: Confirmation of the Optical Afterglow
  28. GRB 081127: Swift-BAT refined analysis
  29. GRB 081126: Swift-XRT refined analysis
  30. GRB 081127: Swift detection of a burst
  31. GRB 081126: Swift/UVOT Observations
  32. GRB 081126: optical observations
  33. GRB 081126: Swift-BAT refined analysis
  34. GRB 081126: Enhanced Swift-XRT position
  35. GRB 081126: TAROT Calern observatory optical observations
  36. GRB 081126: Swift detection of a burst
  37. Konus-Wind observation of GRB 081121
  38. GRB081121: Fermi GBM detection
  39. GRB081121: Refined Swift/UVOT observations
  40. GRB 081121: Swift-XRT refined analysis
  41. GRB 081121: Enhanced Swift-XRT position
  42. GRB 081121: GROND observations
  43. GRB 081121: Swift-BAT refined analysis
  44. GRB081121: Swift/UVOT observations
  45. GRB 081121: Swift detection of a burst
  46. GRB 081121: ROTSE-III Detection of Optical Counterpart
  47. GRB081118 : optical upper limit
  48. GRB 081118: Swift-XRT refined analysis
  49. GRB 081118: GROND detection of afterglow
  50. GRB 081118: Swift UVOT Upper Limits
  51. GRB 081118: Swift-BAT refined analysis
  52. GRB 081118: Enhanced Swift-XRT position
  53. GRB 081118: Swift detection of a burst
  54. GRB 081109A: confirmation of possible detection host galaxy
  55. Further Swift-XRT observations of the probable GRB 081105.
  56. GRB 081102: RTT150 Optical observations
  57. GRB 081109: TAROT La Silla observatory optical observations
  58. GRB 081102: MASTER refind and final results
  59. GRB 081109: GROND redshift limit and host extinction
  60. GRB 081025: Swift-XRT further analysis
  61. GRB 081024B: Swift-XRT late-time observations
  62. Swift-BAT refined analysis of trigger 334129
  63. GRB 081109B: Swift/UVOT refined analysis
  64. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  65. GRB 081109A: Possible Swift-UVOT detection
  66. GRB 081109A, Swift-BAT refined analysis
  67. GRB 081109A: Swift-XRT refined analysis
  68. GRB 081109: Fermi GBM detection
  69. GRB 081109: Swift/UVOT upper limits
  70. Swift-BAT Trigger 334129: possible burst
  71. GRB 081109: Swift detection of a burst
  72. GRB 081105: GROND Upper Limits
  73. UVOT/Swift observations of GRB081105
  74. Swift-XRT observations of GRB 081105
  75. GRB 081105 Swift/BAT and IPN Localization
  76. GRB 081025: Fermi GBM observation
  77. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  78. GRB 081104: refined XRT analysis
  79. GRB 081104: Enhanced Swift-XRT position
  80. GRB 081104: Swift-BAT refined analysis
  81. GRB081104: Swift/UVOT Upper Limits
  82. Fermi Detection of GRB 081102
  83. GRB 081104: Swift-XRT position
  84. GRB 081104: Swift detection of a burst
  85. GRB 081102: MASTER prompt optical limit
  86. GRB 081102: Swift-XRT refined analysis
  87. GRB 081102: Swift/UVOT refined analysis
  88. GRB 081102: Swift-BAT refined analysis
  89. GRB 081102: Enhanced Swift-XRT position
  90. Radio observation of GRB 080218b with ATCA
  91. GRB 081102: MASTER VWF promt observation
  92. GRB 081102: Swift detection of a burst
  93. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  94. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  95. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  96. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  97. GRB 081024B: BTA deep optical observations
  98. GRB 081028: CrAO optical observations
  99. GRB 081024B: new Swift-XRT observations
  100. Radio observation of GRB 080229b with ATCA

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