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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"

25840 results found.

  1. GRB 051028 Optical Observations
  2. GRB 051109B : Nainital upper limits
  3. GRB 051114: Radio Observations
  4. GRB 051114: Swift-BAT refined analysis
  5. GRB050925: analysis of the XMM-Newton observation
  6. GRB 051114: Swift-BAT detection of a short burst
  7. GRB 051111: Further spectroscopic analysis
  8. GRB 051111: Radio afterglow
  9. GRB 051113: Swift-BAT refined analysis
  10. GRB 051113: Swift-BAT detection of a burst
  11. GRB051103: Radio Observations
  12. GRB 051109A Milagro GeV/TeV Observations
  13. GRB/SGR 050925: XMM-Newton ToO observation
  14. GRB051111: Swift/UVOT Observations
  15. GRB051111: XRT preliminary analysis
  16. GRB 051109A Optical Observations
  17. GRB 051111a: IR photometry
  18. Faulkes Telescope R-band detection of GRB051111
  19. GRB 051103 Milagro GeV/TeV Observations
  20. GRB 051109B. Radio Observations
  21. GRB 051109A
  22. GRB051109A - radio observations
  23. Konus-Wind observation of GRB 051109A
  24. GRB 051109A: Swift-UVOT Observations
  25. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  26. GRB051109B: no UVOT source detected
  27. GRB051109B: XRT refined analysis
  28. GRB051109A: further steepening in the X-ray light curve
  29. GRB051109A: XRT refined analysis
  30. GRB 051109B: Super-LOTIS Observations
  31. GRB051105B: REM Optical observation
  32. GRB 051109: Rc and Ic observations
  33. GRB 051109: Swift-BAT refined analysis
  34. GRB 051109a: IR Photometry and Astrometry
  35. GRB051109: Swift detection of a burst
  36. GRB 051109a: IR Detections
  37. GRB051105B: Swift/XRT upper limit
  38. GRB051105B: Swift/UVOT upper limit
  39. GRB051103: MASTER: OT limit and host galaxy candidates
  40. GRB051028: Swift-XRT refined analysis
  41. GRB 051105a, observation from Naini Tal and OSN
  42. GRB 051105a: MDM Observations
  43. GRB 051105A: TNG optical observations
  44. GRB051105A: Swift/UVOT Observations
  45. GRB 051105A, radio observations
  46. GRB051103:_MASTER_optical_observations
  47. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  48. XRT observations of GRB 051105A
  49. GRB 051105b: ART optical limits
  50. GRB051105B - A long GRB detected by INTEGRAL
  51. GRB 051105B (INTEGRAL 2701): Optical observation
  52. GRB 051105: Swift detection of a short burst
  53. Recent GRB UBVRcIc field photometry
  54. Konus-Wind observation of GRB 051028
  55. GRB051028 SARA Observation
  56. GRB051028: Swift/UVOT upper limits
  57. GRB051028: Swift XRT Position
  58. GRB 051028 (=H3951): A GRB localized by HETE
  59. GRB051022: Swift XRT measurement of jet break
  60. SGR 1806-20: continued moderate activity seen with INTEGRAL
  61. GRB051021B: Swift/UVOT Upper limits
  62. GRB 051021, Optical Observations
  63. GRB 051022: XRT Refined Spectral and Temporal Analysis
  64. GRB051012: Swift-XRT analysis
  65. GRB 051022 Chandra Observations scheduled
  66. GRB051021B: Swift XRT refined analysis
  67. GRB051021a: optical observations
  68. GRB 051022, mm counterpart
  69. GRB 051022: Swift/UVOT Upper Limits
  70. GRB051022: Radio Counterpart
  71. GRB051022: IR observations
  72. GRB051021A: Swift XRT refined analysis
  73. Konus-Wind observation of GRB 051022
  74. GRB051022: Optical Observations
  75. GRB051021b: Magellan IR Imaging
  76. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  77. GRB 051022, J & K-band observation
  78. GRB051022: Swift XRT Position
  79. GRB 051021: P200 Ks Observations
  80. GRB 051022 (=H3950): SXC Flight Localization is Valid
  81. GRB051021: Swift/UVOT Upper Limits
  82. GRB 051021B: Refined analysis of the Swift-BAT burst
  83. GRB 051022: SSO40 Optical Observations
  84. GRB051022,optical observation
  85. GRB 051022: Optical observations
  86. GRB 051021,optical observation
  87. GRB051021B: Swift XRT Position
  88. GRB 051021B: Swift detection of a burst
  89. GRB051021: Swift XRT analysis
  90. GRB051021 (=H3947): Refined Analysis
  91. Swift-BAT triggered on a posible CR Shower or possible GRB
  92. GRB 050502b: Optical limit
  93. Afterglow candidate of GRB 051016B observed at Lulin
  94. GRB 051016A: Swift/UVOT upper limits
  95. GRB 051016B: refined analysis of the Swift/XRT data
  96. GRB 051016B: Swift/UVOT detection
  97. GRB 051016B,optical observation
  98. GRB 051016B : Optical follow-up at Lulin
  99. GRB 051016B: Refined analysis of the Swift-BAT burst
  100. GRB 051016B: Swift detection of a soft burst

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