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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"

21394 results found.

  1. GRB051109B: no UVOT source detected
  2. GRB051109B: XRT refined analysis
  3. GRB 051109B : Lulin Optical Observations
  4. GRB051109A: further steepening in the X-ray light curve
  5. GRB051109A: XRT refined analysis
  6. GRB051109B: XRT position
  7. GRB 051109B: Super-LOTIS Observations
  8. GRB 051109B Kiso optical follow-up observation
  9. GRB 051109B: Swift detection of a burst
  10. GRB051109: Early Super-LOTIS Detection
  11. GRB 051109: Swift-BAT refined analysis
  12. GRB 051109a: MDM Observations
  13. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  14. GRB051109: Swift detection of a burst
  15. GRB 051109a: IR Detections
  16. GRB 051109: ROTSE-III Detection of Possible Counterpart
  17. GRB051105B: Swift/XRT upper limit
  18. GRB051105B: Swift/UVOT upper limit
  19. GRB051028: Swift-XRT refined analysis
  20. GRB 051105A, 2nd epoch optical observations
  21. GRB 051105a: MDM Observations
  22. GRB 051105A: TNG optical observations
  23. GRB051105A: Swift/UVOT Observations
  24. GRB 051105A, radio observations
  25. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  26. GRB 051105A, optical observations
  27. XRT observations of GRB 051105A
  28. GRB 051105: Swift-BAT improved refined analysis
  29. GRB 051105: Swift-BAT refined analysis
  30. GRB 051105: Swift detection of a short burst
  31. GRB 051022: RTT150 optical observations
  32. GRB051028: Swift/UVOT upper limits
  33. GRB051028: WHT optical candidate
  34. GRB051028: Swift XRT Position
  35. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  36. GRB051022: Swift XRT measurement of jet break
  37. GRB051021B: Swift/UVOT Upper limits
  38. GRB 051022: XRT Refined Spectral and Temporal Analysis
  39. GRB051012: Swift-XRT analysis
  40. GRB051021B: Swift XRT refined analysis
  41. GRB 051022: WSRT Radio Detection
  42. GRB051022: host galaxy redshift
  43. GRB 051022: Swift/UVOT Upper Limits
  44. GRB051022: IR observations
  45. GRB 051022: SOAR JKs Observations
  46. GRB051021A: Swift XRT refined analysis
  47. GRB051022: Optical Observations
  48. GRB 051022: Magellan NIR imaging
  49. GRB051021b: Magellan IR Imaging
  50. GRB 051022, J & K-band observation
  51. GRB051022: Swift XRT Position
  52. GRB051021: Swift/UVOT Upper Limits
  53. GRB 051021B: Refined analysis of the Swift-BAT burst
  54. GRB051021B: Swift XRT Position
  55. GRB 051021B: Swift detection of a burst
  56. GRB051021: Swift XRT analysis
  57. GRB051021.63
  58. Swift-BAT trigger 160640 is not a real GRB
  59. Swift-BAT trigger 160619 is not a GRB
  60. Swift-BAT triggered on a posible CR Shower or possible GRB
  61. GRB 051016b: Gemini Near IR Observations
  62. GRB 051016A: Swift/UVOT upper limits
  63. GRB 051016B: refined analysis of the Swift/XRT data
  64. GRB 051016B: Swift/UVOT detection
  65. GRB 051016B : Optical follow-up at Lulin
  66. GRB 051016B: Refined analysis of the Swift-BAT burst
  67. GRB 051016B: Swift detection of a soft burst
  68. GRB 051016: Swift-BAT refined analysis
  69. GRB051016 XMM-Newton observation
  70. GRB051016: Swift XRT refined analysis.
  71. GRB 051016: LCO optical and near-IR imaging
  72. GRB 051016: PROMPT Observations
  73. GRB051016: Swift detection of a burst
  74. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  75. GRB051006: optical observations
  76. GRB 051012: Swift-BAT detection of burst yesterday
  77. Swift trigger 159578 is not a burst
  78. Swift-BAT Trigger 159578 is a possible burst
  79. GRB050805A: Rc optical observations
  80. GRB 051006: Swift/UVOT Upper Limits
  81. GRB051008: optical candidate
  82. GRB 051008 - a low redshift low-luminosity burst?
  83. GRB051008: optical observation
  84. GRB051008: Swift XRT refined analysis
  85. GRB051008 - Swift UVOT upper limits
  86. Konus-Wind observation of GRB 051008
  87. GRB051008: Final refined analysis of the Swift-BAT burst
  88. GRB 051008: R-band upper limit
  89. GRB051008: Refined analysis of the Swift-BAT burst
  90. GRB051008: Radio Observation
  91. GRB 051008: Swift XRT position
  92. GRB 051008: early Swift XRT analysis
  93. GRB 051008: Swift UVOT Candidate
  94. GRB051008: Swift-BAT detection of a bright burst
  95. GRB 051006: P60 Observations
  96. GRB 051006: XRT refined analysis
  97. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  98. GRB 051006: optical observations at Sierra Nevada
  99. GRB051006: Refined analysis of the Swift-BAT burst
  100. GRB 051006: XRT position

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