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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"

26363 results found.

  1. GRB 051114: Swift-BAT detection of a short burst
  2. GRB 051111: Further spectroscopic analysis
  3. GRB 051111: Radio afterglow
  4. GRB 051113: Swift-BAT refined analysis
  5. GRB051103: Radio Observations
  6. GRB/SGR 050925: XMM-Newton ToO observation
  7. GRB051111: Swift/UVOT Observations
  8. GRB051111: XRT preliminary analysis
  9. GRB 051111: Swift-BAT refined analysis
  10. GRB 051109A Optical Observations
  11. GRB 051111A : Lulin BVRI multi band afterglow observation
  12. GRB051111a: SARA Observations
  13. GRB 051111a: IR photometry
  14. GRB 051109B. Radio Observations
  15. GRB 051109A
  16. GRB051109A - radio observations
  17. GRB 051109B: Swift-BAT refined analysis
  18. GRB 051109A: Swift-UVOT Observations
  19. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  20. GRB051109B: no UVOT source detected
  21. GRB051109B: XRT refined analysis
  22. GRB 051109B : Lulin Optical Observations
  23. GRB 051109A : Lulin BVRI Optical afterglow observation
  24. GRB051109A: further steepening in the X-ray light curve
  25. GRB051109A: XRT refined analysis
  26. GRB 051109B: Super-LOTIS Observations
  27. GRB051105B: REM Optical observation
  28. GRB 051109B: Swift detection of a burst
  29. GRB 051109: Rc and Ic observations
  30. GRB 051109: Swift-BAT refined analysis
  31. GRB 051109a: IR Photometry and Astrometry
  32. GRB051109: Swift detection of a burst
  33. GRB 051109a: IR Detections
  34. GRB051105B: Swift/XRT upper limit
  35. GRB051105B: Swift/UVOT upper limit
  36. GRB051103: MASTER: OT limit and host galaxy candidates
  37. GRB051028: Swift-XRT refined analysis
  38. GRB 051105a, observation from Naini Tal and OSN
  39. GRB 051105a: MDM Observations
  40. GRB 051105A: TNG optical observations
  41. GRB051105A: Swift/UVOT Observations
  42. GRB 051105A, radio observations
  43. GRB051103:_MASTER_optical_observations
  44. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  45. GRB 051105A, optical observations
  46. XRT observations of GRB 051105A
  47. GRB 051105b: ART optical limits
  48. GRB 051105B (INTEGRAL 2701): Optical observation
  49. GRB 051105: Swift detection of a short burst
  50. Recent GRB UBVRcIc field photometry
  51. GRB051028 SARA Observation
  52. GRB051028: optical observations
  53. GRB051028: Swift/UVOT upper limits
  54. GRB051028: Swift XRT Position
  55. GRB051028:MASTER observations
  56. GRB051021B: Swift/UVOT Upper limits
  57. GRB 051021, Optical Observations
  58. GRB 051022: XRT Refined Spectral and Temporal Analysis
  59. GRB051012: Swift-XRT analysis
  60. GRB051021B: Swift XRT refined analysis
  61. GRB 051022, mm counterpart
  62. GRB 051022: Swift/UVOT Upper Limits
  63. GRB051022: Radio Counterpart
  64. GRB051022: IR observations
  65. GRB051021A: Swift XRT refined analysis
  66. GRB051022: Optical Observations
  67. GRB051021b: Magellan IR Imaging
  68. GRB 051021, SMARTS optical/IR observations
  69. GRB051022: Swift XRT Position
  70. GRB 051021: P200 Ks Observations
  71. GRB 051022 (=H3950): SXC Flight Localization is Valid
  72. GRB051021: Swift/UVOT Upper Limits
  73. GRB 051021B: Refined analysis of the Swift-BAT burst
  74. GRB 051022: SSO40 Optical Observations
  75. GRB051022,optical observation
  76. GRB 051021,optical observation
  77. GRB 051021B: Swift detection of a burst
  78. GRB 051021 : optical afterglow observation at Lulin
  79. GRB 051021: Optical observations and candidate afterglow
  80. GRB051021.63
  81. GRB051021.6: MASTER optical observation
  82. GRB051021: A GRB Localized by HETE
  83. Swift-BAT triggered on a posible CR Shower or possible GRB
  84. GRB 051016b: Optical limit
  85. Afterglow candidate of GRB 051016B observed at Lulin
  86. GRB 051016A: Swift/UVOT upper limits
  87. GRB 051016B: refined analysis of the Swift/XRT data
  88. GRB 051016B: Swift/UVOT detection
  89. GRB 051016B,optical observation
  90. GRB 051016B : Optical follow-up at Lulin
  91. GRB 051016B: Refined analysis of the Swift-BAT burst
  92. GRB 051016B: Swift detection of a soft burst
  93. GRB 051016: Swift-BAT refined analysis
  94. GRB051016 XMM-Newton observation
  95. GRB051016: Swift XRT refined analysis.
  96. GRB 051016: PROMPT Observations
  97. GRB051016: Swift detection of a burst
  98. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  99. GRB 051012: Swift-BAT detection of burst yesterday
  100. Swift-BAT Trigger 159578 is a possible burst

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